The general philosophy of XDT when it comes to Geothermal Exploration. Using passive seismic waves and innovative seismic software to explore the subsurface.

1. XDT on Geothermal Exploration
Understand Seismology, and you’ll
Understand the Subsurface

2. You don’t need to drill to know what's going on
beneath your feet. XDT uses passive seismic
signals to accurately describe the subsurface.

3. XDT has great experience with few staff. Therefore, we
can offer expert services at low costs.
Ph.D. – University of Washington, 1989
B.S. - University of Illinois, 1979
Seismologist and Volcanologist, Dr.
Jonathan Lees knows earthquakes
B.S. – North Carolina State
University
Alex Miller blends environmental
science with geophysics.

4. Geothermal exploration is more than
finding where the heat is. Its finding
the best way to it.
Subsurface
Structures
Subsurface
Densities
Fissures
and
Anisotropy
Rock Types

5. XDT provides innovative and proven
techniques of analysis. There aren’t any
black boxes here.

6. Shear wave splitting – can be used in identifying fissures and
other anisotropic elements. Click the earthquake circle below.
Earthquake
Seismometers
Subsurface cracks
and fissures
When the shear waves generated from the earthquake
propagate through the cracks, polarization occurs. The
different arrival times from the split s-waves can be
measured to model where the foliation or fissures occur.

7. Wave Attenuation and Velocity – used to identify subsurface
characteristics. Click the earthquake circle below.
Earthquake
Seismometers
Subsurface Body
When passive seismic waves propagate through differing
bodies, attenuation and changes in velocity occur. The
different arrival times and amplitudes can be measured to
model the properties and locations of the subsurface bodies.

8. Not only are our techniques innovative,
but our software is one of a kind.
Radiation
Patterns
Filtering
Spherical Distribution
Graphing
Focal Mechanism
Plotting
Interactive Maps
Arrival Time
Predictions
Time Series
analysis
Spectrograms
Seismic Tomography
Deconvolution
Cross Sections
Great Circles
Zoeppritz EquationsTomographic Inversion
Tomography
Ternary Plots
Area Analysis
Seismic Data
Conversions
Moveout
Displays

9. Want to know what’s going on in Enhanced
Geothermal Systems (EGS)? Show us the seismic.
Granite Body
Fissures/Cracks
Geothermal
Source
Seismometers

10. Upcoming Geothermal Projects? Give
us a call, we’re interested.
Alex Miller
Email: ajcmiller@xdtek.com
Phone: (919) 624-1251
Skype: alex_levi_miller
Jonathan Lees
Email: jonathan.lees@unc.edu