Earthquake aftermath report for Guihulngan, by the Mines and Geosciences Bureau. Onsite inspection done in April 2012

1. RESULTS OF THE
MINES AND GEOSCIENCES BUREAU’S (MGB)
1:10,000 SCALE GEOHAZARDS
(LANDSLIDE AND FLOOD) ASSESSMENT AND MAPPING
OF THE GUIHULNGAN CITY, NEGROS ORIENTAL
PROVINCE
April 2012

2. RESULTS OF THE MINES AND GEOSCIENCES BUREAU’S (MGB)
1:10,000 SCALE GEOHAZARDS (LANDSLIDE AND FLOOD) ASSESSMENT AND
MAPPING OF THE GUIHULNGAN CITY, NEGROS ORIENTAL PROVINCE
The Mines and Geosciences Bureau (Central Office)-Department of
Environment and Natural Resources (MGB-DENR) conducted landslide and flood
assessment and mapping (1:10,000 scale) of areas within the city of Guihulngan on
April 12 to 14, 2012. Comprising the geohazards assessment team are geologists
from the MGB-Central Office (MGB-CO) namely Dr. Karlo L. Queaño, Ms. Gina May
P. Mercado, Ms. Carleen Joy R. Telles and Ms. Christine Jeiselle G. Guarino. They
were assisted by Mr. Godfrey F. Gemal, Mr. Renan C. Gatdula and Mr. Edward K.
Tolero also from the MGB-CO.
The assessment is in line with the government’s efforts aimed at reducing, if
not, totally mitigating the destructive effects and impacts of natural hazards on the
populace. The assessment is also a follow-up to the geohazards assessment and
mapping (1:50,000 scale) conducted in May 2009 by geologists from MGB Central
Office and Region VII (See Appendix I).
The assessment was only limited to areas covered by the 1:10,000 scale
base maps provided to the team. The assessed areas were rated as having low,
moderate, high or very high (critical) susceptibility to landslide. Similar flood
susceptibility rating (i.e., high, moderate or low) was also given to the assessed
barangays. Tables 1 and 2 show the parameters used for the assessment.
When appropriate, the barangay officials were presented with a Landslide
Threat Advisory. This advisory informs them of their area’s susceptibility to
landslides and contains the corresponding recommendations.
Notable results were obtained by the MGB-DENR from the following
barangays: Bakid, Balogo, Banwague, Bulado, Buenvista, Calamba, Hilaitan,
Hinakpan, Humay-Humay, Kagawasan, Mabunga, Magsaysay, Malusay, Mani-ak,
McKinley, Nagsaha, Poblacion, Planas, P Zamora, Tacpao, T-Beach, T-Hill and
Villegas. These results are tabulated in Tables 4 and 5.

3. Table 1. Landslide susceptibility parameters used during the assessment
Landslide Low Moderate High Very High
Susceptibility
Paremeters
A. Slope Low to Moderate to Steep to very Steep to very
Gradient moderate steep (18°-35° steep (>35°
) ) steep (>35°)
(<18° )
B. Weathering/ Slight to Moderate Intense; Soil Intense; Soil
Soil moderate usually non- usually non-
Characteristics cohesive cohesive
C. Rock mass Very good to Fair Poor to very Poor to very
strength good poor poor
D. Ground Stable with no Soil creep and Inactive Active
Stability identified other landslides landslides
landslide indications for evident; evident;
scars, either possible tension cracks tension cracks,
old, recent or landslide present bulges,
active occurrence are terracets,
present. seepage
present.
E. Human May be an
Initiated aggravating
effects factor
Table 2. Flood susceptibility parameters used during the assessment
High flood Areas likely to experience flood heights of greater than 1.0
susceptibility meters and/or flood duration of more than 3 days. These
areas are immediately flooded during heavy rains of several
hours; include landforms of topographic lows such as active
river channels, abandoned river channels and areas along
river banks; also prone to flashfloods.
Moderate flood Areas likely to experience flood heights of 0.5 to 1.0 meters
susceptibility and/or flood duration of 1 to 3 days. These areas are subject
to widespread inundation during prolonged and extensive
heavy rainfall or extreme weather condition. Fluvial terraces,
alluvial fans, and infilled valleys are areas moderately
subjected to flooding.
Low flood Areas likely to experience flood heights of less than 0.5
susceptibility meter and/or flood duration of less than 1 day. These areas
include low hills and gentle slopes. They also have sparse
to moderate drainage density

4. Table 3. Results of Landslide Assessment
Landslide
Location Susceptibility Remarks/ Recommendations
Rating
Barangay Bakid
Sitio Luho High Rotational and translational landslides, rock
falls are present in the steep slopes of Sitio
Luho. Tension cracks were observed on a
hill slope along the trail of the area. Cracks
along the road of Sitio Luho are also
present.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Barangay Balogo
Mountainous High Barangay is bounded by steep slopes,
portions of the hence, settlement at the foot of the
barangay slope is highly discouraged.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay Proper Low to Barangay proper is located at a relatively
Moderate flat area; however, several portions of the
hills bounding the barangay proper exhibit
creeping. Tension cracks were also noted
in the vicinity of Balogo Elemetary School.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.

5. Sitio Cantupas High Numerous landslides/rockslides both active
and inactive were noted in the area. A
reactivated translational slide was
observed in a portion of the Sitio, where
a casualty was reported in a landslide
event in 2001. Tension cracks are also
present near the crown of an old landslide
on the trail going to Sitio Panigsulang.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Cangcuybo Moderate to Portions of the Sitio located on relatively
High flat-lying areas have moderate landslide
susceptibility. Active creeping was noted in
the slopes of the hills bounding the flat-
lying areas. Tension cracks and old and
reactivated landslides were observed in the
mountainous portions, which makes the
area highly susceptible to landslides.
Recommendation: Settlement near the
foot of the slopes and along areas of
active gully development is
discouraged. Observe for and/or monitor
for presence of mass movement and report
to the MGB/municipal authorities (e.g.,
landslides, tension cracks); Observe for
saturated ground or seeps and sunken or
displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Hinugpayan Low to The area is characterized by gentle, rolling
Moderate topography. Active creeping was noted in
the area.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.

6. Sitio Panigsulang High Sitio is located along the slopes of the
mountainous areas of the barangay.
Numerous landslides/rockslides were
observed in the area. Tension cracks were
noted in the vicinity. Four (4) houses were
relocated following the February 6
earthquake. Settlement should be
discouraged along the slopes and in
areas fronting active gully development.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay Banwague
Barangay Proper / Low to Barangay Proper lies on relatively gentle
Banwague Moderate topography. Slopes of the hills bounding
Elementary School the barangay proper exhibit creeping.
Several buildings of the Balogo Elementary
School were severely damaged and were
rendered unusable by the earthquake; the
walls of one of the buildings experienced
tilting after the earthquake.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.

7. Sitio Cansalacan Moderate to The area is bounded by steep hills with
High numerous old and recent landslides.
Tension cracks were noted, especially
along the slopes of the hills bounding the
tributaries of the Guinoba-an River.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Lipata High The Sitio is situated on the hilly portions of
the barangay. Numerous active and
inactive landslides were noted in the area
and several tension cracks were observed.
Residents should be discouraged from
building houses along and at the foot of
the slopes, as well as in areas where
active gully development were noted.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay Bulado
Sitio Maculos High Widespread creep were noted, as indicated
by terracettes. Along the road, small
translational landslides were also noted.
Area is situated on top of extremely jointed
and moderately weathered interbedded
sandstone and mudstone.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.

8. Barangay Buenvista
Mountainous areas Moderate to Several areas have unstable slopes, as
between the high indicated by tension cracks, terracetes and
barangay proper old landslides. Settlement at the base of
and Brgy. steep slopes must be discouraged.
Kambulawan,
Planas Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Sitio Ilihan High Slopes bounding the eastern portion of the
Sitio already show signs of instability as
indicated by the presence of large tension
cracks and terracetes. The Sitio could act
as a landslide debris accumulation zone.
Relocation of residents should be
seriously considered.
Monitor the development of tension cracks
in the area. Observe for saturated ground
or seeps report to the MGB/municipal
authorities.
Sitio Malabuyocon High Tension cracks and terracetes have been
noted on the slopes of the Sitio. A house on
the affected slope (GPS reading: N
10o08’34.8”/ E 123o14’12.3”) must be
relocated.
Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Sitio Panubigan High Slopes bounding the barangay and facing
the Buenavista River are highly unstable.
Several large tension cracks, terracetes
and active landslide have affected the
slopes. Slope undercutting by the
Buenavista River partly caused the
instability of the ground. Relocation of
houses on the slope must be
considered.

9. Officials should closely monitor the
development of landslides along the
Buenavista River. The river should
always be cleared of landslide debris to
avoid artificial damming of the river and
consequent flash flooding in the
downstream areas (including the barangay
proper).
Barangay proper Low to Slopes behind the barangay proper and
moderate fronting the Buenavista River should be
closely monitored for erosion/ slope
instability. Building of heavy structures
must be avoided.
Slopes along the (GPS reading: N
10o08’36”/ E 123o14’30.2”) road leading to
the barangay proper are highly unstable.
Slope stabilization measures must be
implemented immediately.
The perimeter fence of the Barangay Hall is
tilting/creeping (improper design of the
fence; weep holes may have to be made to
drain the slope of water esp. during heavy
rains).
Observe for presence of mass movement
(e.g., tension cracks, terracetes) in all
portions of the barangay.
Sitio Cantinape High The area was hit by a slide following an
earthquake. Slopes behind the Sitio remain
highly unstable. Relocating the Sitio should
be seriously considered, as it is also flood-
prone. Observe for and/or monitor for
presence of mass movement and report to
the MGB/municipal authorities (e.g.,
landslides, tension cracks); Observe for
saturated ground or seeps and sunken or
displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Upper Culasi High Mountain slopes bounding the Sitio have
high landslide susceptibility. Settlement at
the footslope must be avoided.
Sitio Lower Culasi Low Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks).

10. Buenavista Low A natural drain behind the Buenavista
Elementary School Elementary School exists. Officials should
ensure that the floors of the classrooms are
higher than the said drain to avoid water
seepage.
Barangay Calamba
Barangay proper High This area is bounded by steep slopes.
Numerous huge translation slides were
observed along the national highway.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Settlement at the foot of the slope is highly
discouraged.
Sitio Kinamoan High Huge rotational slide and widespread creep
were observed in the area. Area is
underlain by highly weathered and jointed
interbedded sandstone and mudstone.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Settlement at the foot of the slope is highly
discouraged.
Sitio Maantol High Barangay road and farmland were affected
by slides, particularly rockfall. Huge boulder
was noted to be hanging precariously on
top of the slope.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Avoid
settlement at the footslope.

11. Sitio Pilaon High The sitio is bounded by steep and jointed
slopes of interbedded sandstone and
mudstone. Huge rotational slides were
noted affecting the barangay road.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Avoid
settlement at the footslope.
Barangay Hilaitan
Sitio Marulao High Slopes bounding Sitio Marulao are
relatively steep. Some sections appear to
have already been weakened by the
weathering of rocks underlying the slopes.
Some of the rocks lie loosely on the slope.
One house at Sitio Marulao landslide (GPS
reading: N10o14’43.4”/ 123o18’55.4”) needs
to be relocated. Observe for and/or monitor
for presence of mass movement and report
to the MGB/municipal authorities (e.g.,
landslides, tension cracks); Observe for
saturated ground or seeps and sunken or
displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Busay Moderate to Slopes bounding the northern portion of
high Sitio Busay proper have high landslide
susceptibility. Old landslides were noted.
Settlements should not be allowed at the
foot slope. Ridge separating Lake Danao
and Sitio Busay has developed tension
cracks. This puts the an area (GPS:
N10o14’44.6”/ 123o16’42.7 ”) at Sitio Busay
at high risk to landslide. In addition,
boulder-sized rocks lie precariously on the
slope facing the said area, making it
susceptible to rock fall. Relocation of the
houses at the base of the slope should be
seriously considered. In all areas at Sitio
Busay.
Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated

12. ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Sitio Danao Moderate to Slopes bounding the road leading to Sitio
high Danao have high landslide susceptibility.
The former military detachment area has
been affected by tension cracks and is
bounded by slopes that are highly
susceptible to landslide. This should not be
used for settlement. In addition, slopes
bounding Lake Danao have been affected
by active and old landslides. Houses on the
mid- and footslope should be considered
for relocation. In all areas at Sitio Danao,
observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Barangay Hinakpan
Barangay Proper Low to Barangay proper and daycare center is
Moderate located on flat lying area bounded by cliff
forming limestone with numerous old/
inactive rockslides. Active creeping and
reactivated slides were also noted along
the road going to the barangay proper.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities
Sitio Bonbon High Recent translational slides were noted in
slopes of the mountains bounding the area.
Old landslides and several tension cracks
were also observed. Relocation sites
should be identified for the farming
community situated at the foot of the
slopes.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken

13. or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Cantumapon Low to Old/ reactivated rockslides/ rockfalls were
Moderate observed in the area, particularly along
roadcuts. Active creeping and tension
cracks were also noted in the slopes of the
hills in the vicinity of the Sitio.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay Humay-Humay
Humay-Humay Very Critical A recent translational slide located at the
Elementary School southeast portion of the school. Numerous
tension cracks were also noted, particularly
at the school’s buildings. The school is
underlain by highly weathered and jointed
interbedded sandstone and mudstone.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Relocation of the school is highly
recommended. The school is unsuitable
as an evacuation site, unless slope
stabilization measures are implemented.
Barangay proper High Numerous recent landslides were observed
in the slopes bounding the brgy. proper.
Sets of tension cracks were also noted on
top of the the slopes bounding this area.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.

14. Sitio Tinofindon High Sets of tension cracks were observed in the
(Slope bounding area. Houses located on top of the slope
the brgy. proper) are at high risk to landslide particularly
during extreme heavy rainfall.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages). For
residents located on top of the slope,
identifying an evacuation or relocation
site is highly recommended, unless
slope stabilization measures are
implemented.
Barangay Kagawasan
Bey-ang Moderate A translational landslide is present along
the trail of Sitio Bey-ang, Brgy. Kagawasan.
Landslide deposits are carried away during
heavy rains by the creek below the
landslide area. Large, wide cracks are
found crossing the trail of Bey-ang,
continuing up to nearby Brgy. Bakid and
affecting a house. Creep is also observed
in the area, as manifested by terracetes
and tilted trees.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Constant communication and updates with
Brgy. Bakid on geohazard situation.
Gabong Low The area is located on gently rolling hills.
Creep is observed on some areas. A
church is found on top of a creeping low
hill. Further developments are highly
discouraged. Relocation may be
considered unless slope stabilization is
observed.

15. Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Hilly portions of High Five rotational landslides are observed on
Brgy. Kagawasan the hills of Brgy. Kagawasan near its
facing Brgy. T- boundary with Brgy. T-beach. Settlement at
beach the footslope of these hills is highly
discouraged.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Barangay Mabunga
Sitios Buski, Critical Earthquake-induced landslide affected a
Malabitoon, huge portion of a mountain at brgy.
Panigsolang, Mabunga. Remobilization/ reactivation of
Tamuag and the slide is likely, especially that tension
Talayong cracks are still present near the crown of
the slide. Such event puts sitios Buski,
Malabitoon, Panigsolang, Talayong and
Tamuag at high risk to landslide/ debris
flow. Relocation of the sitios is strongly
recommended.
Barangay Magsaysay
Sitio Giob High Translational slides were observed in the
area. The sitio is also prone to rockfall.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities

16. Barangay proper High Barangay proper is bounded by steep
slopes where huge limestone boulders
were observed to be hanging. Houses
along the provincial road are threatened by
rockfall.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Removal of the
boulders is strongly recommended.
Sitio Malinoy High A huge translational slide is observed in the
area. Houses at the footslope are at risk.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities
Barangay Malusay
Barangay Proper Low Area is situated to relatively gentle slope.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks).
Barangay Mani-ak
Barangay Mani-ak Moderate to Slopes bounding Barangay Mani-ak and
proper high those adjacent to the road leading to the
barangay proper are highly susceptible to
landslide. Water seepage was observed at
the base of the slope in one of the areas at
Barangay Mani-ak (GPS reading:
o o
N10 15’44.1”/ 123 16’30.4”). The seepage
emanated following the strong earthquake
in February 2012. Two houses at the base
of the slope should be considered for
relocation. Another house at Barangay
proper (GPS reading: N10o15’45.5”/
123o16’34.1”) is also recommended for
relocation. Settlement at the base of

17. mountain slopes bounding the barangay
should be avoided.
Barangay Mc Kinley
Barangay Proper Low Large cracks on the highway of McKinley
were observed after the February 6, 2012
earthquake. Houses were badly destroyed
due to land subsidence.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Strengthening
of the roads and foundation of houses is
advised.
Barangay Nagsaha
Sitio Giob High Numerous translational slides are observed
in the area. About 10 houses situated on
footslope are at risk.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Avoid
settlements on footslopes.
Barangay Poblacion
Sitio Larena Critical Recent slide damaged 5 houses along the
road at sitio Larena. Relocation of these
houses is strongly recommended.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Pisoc High A huge translational slide is observed along
the road to sitio Pisoc.

18. Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Implement
slope stabilization measures.
Barangay Planas
Sitio Kambulawan Moderate to Slopes bounding the southeastern portions
High of the Sitio are highly susceptible to
landslide. Tension cracks and terracets
have been noted on the slopes. Slope
failure could directly hit houses at the Sitio
(e.g., those centered ~ in an area with GPS
reading: N10o09’45.1”/ E 123o14’35.7”).
Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities
Sitio Mambog Low Sitio Mambog proper has low landslide
susceptibility. The sitio is not recommended
as a relocation/evacuation site for those
affected by earthquake in February 2012 as
it is a flood-prone area. A creek has started
to devep in the Sitio.
Slopes bounding the eastern side of Sitio
Mambog have high landslide susceptibility.
Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities. Closely
coordinate with Brgy. Upper Moog.
Landslide debris at the said barangay could
be remobilized during continuous heavy
rain and partly hit the Sitio (see results of
flood susceptibility rating)

19. Sitio Lower Moog Moderate to Some slopes of the Sitio are experiencing
high creep (as indicated by terracets; tilted
trees; e.g., in an area with GPS reading of
N 10o10’12.2”/ E 123o14’06.2”). Settlement
on or at the foot of the slope should be
discouraged. Brgy. officials should closely
coordinate with those of Sitio Upper Moog
where a big landslide occurred.
Remobilization of landslide debris
especially during heavy continuous rains
could hit the Sitio.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Upper Moog High The Sitio was recently hit by a huge
landslide. Being the case (and especially
that the Sitio appears to be located on an
old landslide deposit), the area where
landslide occurred should be declared as a
permanent danger zone. Several huge
tension cracks remain near the crown of
the landslide. Remobilization of the
landslide debris is likely especially during
heavy continuous rains.
All drainages/creeks should be cleared of
landslide debris as this could cause
artificial damming and consequently
flashflooding of areas downstream.
Settlement near the landslide area
(including near the crown and toe) is highly
discouraged.
Other slopes at Sitio Upper Moog also
show signs of instability (e.g., terracetes,
tension cracks at the crown and toe of the
slide). Residents should closely monitor
the development of the said crack (GPS: N
10o10’15.9”/ E 123o14’05.1”). Observe for
and/or monitor for presence of mass
movement and report to the MGB/municipal
authorities (e.g., landslides, tension
cracks); Observe for saturated ground or
seeps and sunken or displaced road
surfaces and report to the MGB/municipal

20. authorities.
Barangay proper Moderate to Slopes bounding the basketball court and
high elementary school are very unstable.
Tension cracks, terracetes and old and
recent slides were observed. Further
developments near the affected slopes
should not be allowed. (GPS: N10o10’28.9”/
E 123o14’33.4”).
Barangay P. Zamora
Sitio Pitogo High Large tension cracks (~1-1.5 m wide and 5
m deep) and a creep were observed in the
Sitio Pitogo, Brgy. P. Zamora. A part of the
road was uplifted and destroyed due to the
February 2012 earthquake. Settlement at
the cracked slopes are highly discouraged.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Barangay Tacpao
Sitio Kambang High Numerous landslides were noted along the
barangay road leading to barangay proper.
Boulder-sized debris were observed along
barangay road.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Near the boundary High Recent landslide was noted on the Macalua
of Brgys. Tacpao Farm.
and Binobohan
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken

21. or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Sitio Lagaan High Huge translational landslides were noted
on the steep slope bounding the area.
Tension cracks were also reported on top
of this slope.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Settlement at the footslope is highly
discouraged.
Sitio Macaang-ang High Numerous translation landslides were
observed on the steep slopes.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Settlement at the footslope is highly
discouraged.
Sitio Cabanog High In 2009 MGB’s Geohazards report, the
area was affected by a landslide damaging
at least 4 houses.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay proper Moderate Area is located on rolling to moderately-
steep slope.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken

22. or displaced road surfaces and report to the
MGB/municipal authorities.
Barangay T-Beach
Botong High Tension cracks, approximately 1 ft wide,
are observed at the top of a hill in Sitio
Botong of Brgy. T-beach. A huge rotational
landslide is also present in the area.
Recommendation: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Bebe High Landslide debris of several succeeding
huge translational slides covered the road
trail of Sitio Bebe in Brgy. T-beach.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Back of Filomena High A steep slope is creeping towards the back
Elementary School of Filomena Elementary School. Soil from
the slope subsided and partially buried the
back of the school after the recent,
February 2012 earthquake. A house
seating on top of the steep slope is advised
to be relocated.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Evacuation of children in Filomena
Elementary School is advised during
unfavorable weather conditions (e.g.
typhoons, heavy rains), unless slope
stability measures are observed.

23. Barangay T-Hill
Sitio Bulay Critical A huge translational slide and tension
cracks are observed on steep slopes
bounding the area. Relocation of 5
houses very near the slide is strongly
recommended.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Sitio Kandaislan Critical A translational slide affected a mountainous
portion of the sitio. 10 houses at the
footslope are at risk and must be
relocated.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Sitio Batang High Translational slides are observed on a
slope bounding the sitio.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages).
Sitio Tubod High Several active translational slides are
observed. A house built adjacent to the
slide area should be relocated.
Recommendations: Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken

24. or displaced road surfaces and report to the
MGB/municipal authorities. Develop an
early warning system (e.g. signages). Avoid
settlements on footslopes.
Barangay Villegas
Barangay proper Low to An unstable ground exists adjacent to the
and elementary moderate Brgy. Villegas Elementary School. Trees
school must be trimmed to lessen the stress on
the ground due to swaying. Drainage canal
should be paved to avoid erosion of the
ground adjacent to the school. Slopes
bounding the school should not be left
unprotected.
Slopes beside the basketball court has high
landslide susceptibility. Observe for and/or
monitor for presence of mass movement
and report to the MGB/municipal authorities
(e.g., landslides, tension cracks); Observe
for saturated ground or seeps and sunken
or displaced road surfaces and report to the
MGB/municipal authorities.
Sitio Lower Malho Moderate Slopes (e.g., GPS: N 10o10’03.4/ E
123o13’51”) bounding Sitio Malho are
affected by terracetes/creeping. Observe
for and/or monitor for presence of mass
movement and report to the MGB/municipal
authorities (e.g., landslides, tension
cracks); Observe for saturated ground or
seeps and sunken or displaced road
surfaces and report to the MGB/municipal
authorities.
Sitio Upper Malho High Several slopes bounding Sitio Upper Malho
developed tension cracks. These include
those near the landslide area at Sitio Upper
Moog, Brgy. Planas. A number of slides
were also noted. Houses situated at the
mid, at the base and in the vicinity of the
slope where tension cracks have been
noted should be considered for relocation.
Sitio Mantuhod High Slopes near the area where landslide that
affected Sitio Upper Moog, Brgy. Planas
have developed tension cracks. Houses
on and near the slope should be relocated.
(e.g., those with GPS reading centered at
N 10o10’51.5”/ E 123o13’40.3”. Mounanous
areas surrounding Sitio Mantuhod have
high landslide susceptibility.

25. Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Sitio Agimit Low to Observe for and/or monitor for presence of
moderate mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Sitio Lower High A hilly area at Sitio Lower (GPS reading: N
10o10’46.8”/ E 123o13’17.1) some distance
away from the barangay proper has high
landslide susceptibility. Floats of rocks
(remnants of previous rock fall) were
observed. Relocation of remaining
household should be done immediately.
Observe for and/or monitor for presence of
mass movement and report to the
MGB/municipal authorities (e.g., landslides,
tension cracks); Observe for saturated
ground or seeps and sunken or displaced
road surfaces and report to the
MGB/municipal authorities.
Table 4. Results of Flood Hazard Assessment
Lanslide
Location Susceptibility Remarks/ Recommendations
Rating
Barangay Balogo
Sitio Cansalacan High Portions of Sitio Cansalacan, particularly
those that are situated at the floodplains of
a tributary of the Guinoba-an River are
highly prone to flooding. Some residential
areas as well as agricultural lands in the
Sitio are affected by sheet and flash
flooding.
Recommendations: Observe for rapid
increase/decrease in creek/river water

26. levels, possibly accompanied by increased
turbidity (soil content). Implement flood
control measures.
Sitio Cantupas High Sitio Cantupas is highly prone to flash
flooding. Landslide debris from the unstable
slopes of the mountains bounding the
Guinoba-an River could lead to artificial
damming of the said river.
Recommendations: Observe for rapid
increase/decrease in creek/river water
levels, possibly accompanied by increased
turbidity (soil content).
Barangay Calamba
Barangay proper High Area is prone to flooding and flashflood.
Landslides on upstream may cause
artificial damming that could lead to
flashflood, during heavy rainfall.
Recommendations: Observe for rapid
increase/decrease in creek/river water
levels, possibly accompanied by increased
turbidity (soil content). Implement flood
control measures. Observe for and/or
monitor for presence of mass movement on
the upstream.
Barangay Mabunga
Sitio Malabitoon High Area is prone flashflood. Two houses were
severely affected during Typhoon Ruping.
Recommendations: Observe for rapid
increase/decrease in creek/river water
levels, possibly accompanied by increased
turbidity (soil content). Observe for
landslides in the upstream portion as this
could lead to artificial damming.
Barangay McKinley
Brgy. Proper Moderate Sea walls were broken by the February 6,
2012 earthquake thus decreasing the
protection of the area from storm surges.
Evacuation of the residents near the coast
with broken sea walls is advised during
typhoons, unless a stronger barrier is
reconstructed. Canals were also narrowed
and clogged by displaced soil, thus

27. increasing the probability of floods during
heavy rains.
Recommendations: Development of early
warning device/system. Residents of the
coastal areas with broken sea walls are
advised to evacuate to the higher flat areas
during strong typhoons. Canals must be re-
excavated to prevent drainage-related
flooding in the area.
Barangay P. Zamora
Areas along the P. High Settlement near the river banks is highly
Zamora River discouraged.
Recommendations: Develop an early
warning device/system. Observe for rapid
increase/decrease in creek/river water
levels, possibly accompanied by increased
turbidity (soil content). Evacuation of the
residents, along the banks of P. Zamora
River, to P. Zamora Elementary School
during heavy rains and strong typhoons is
advised.
Barangay Tacpao
Sitio Cambanog High In 2009 MGB’s Geohazards Report,
houses near Cansuhi Creek and Sitio
Cambanog were affected by floodwater.
Recommendations: Observe for rapid
increase/decrease in creek/river water
levels, possibly accompanied by increased
turbidity (soil content). Implement flood
control measures.
It should be noted that these susceptibility ratings were arrived at as of this
field assessment. However, the rating could advance (e.g., from low to moderate,
moderate to high). Hence, the MGB constantly recommends strict and continuous
monitoring by the barangays.

28. MGB GEOHAZARD ASSESSMENT TEAM
Karlo L. Queaño, Ph.D. Gina May P. Mercado
Supv. Science Research Specialist Senior Science Research Specialist
Team Leader
Carleen Joy R. Telles Christine Jeiselle G. Guarino
Senior Science Research Specialist Science Research Specialist - II
Prepared by:
Godfrey F. Gemal Renan C. Gatdula
Contractual Employee Contractual Employee