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Department of Earth Sciences KFUPM Introduction to Seismology Fault Mechanism  Introduction to Seismology-KFUPM Ali Oncel [email_address] http://www.learninggeoscience.net/free/00071/index.html
Previous Lecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM
What type of faulting? A normal faulting mechanism.  Which plane do you think is the fault plane ?   A reverse faulting mechanism.  Which plane do you think is the fault plane ? Strike-slip faulting.  Which strike? Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
[object Object],[object Object],[object Object],[object Object],[object Object],Select your data of Focal Mechanism via the Interactive Database Introduction to Seismology-KFUPM
Focal Mechanism Map Introduction to Seismology-KFUPM
Now, you can download the map under different options. JPG is easy to download but *.PS is good if making up  for picture is needed. Introduction to Seismology-KFUPM Now, just click on the option “JPG” and see the map of focal mechanisms.
Introduction to Seismology-KFUPM
What is CMT? Introduction to Seismology-KFUPM
Homework due March, 28 ,[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM
Plate Zones ,[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM
Large Earthquakes (5 yr) The boundaries of plates are evident from the pattern of earthquake activity.   Introduction to Seismology-KFUPM
Active vs. Passive Continental Margins Earthquakes lie mostly along the boundaries of moving plates. Introduction to Seismology-KFUPM Parks and Plates ©2005 Robert J. Lillie
Active vs. Passive Continental Margins Introduction to Seismology-KFUPM The nearest plate boundary to the U. S. East Coast is the Mid-Atlantic Ridge.  Parks and Plates ©2005 Robert J. Lillie
Marshak, EARTH  (Norton, 2005) Active vs. Passive Continental Margins Parks and Plates ©2005 Robert J. Lillie The U. S. West Coast   lies along a   convergent plate boundary , and is thus an  ACTIVE CONTINENTAL MARGIN .   Introduction to Seismology-KFUPM
Active vs. Passive Continental Margins The U. S. East Coast   is far from   a plate boundary , and is thus a  PASSIVE CONTINENTAL MARGIN . Parks and Plates ©2005 Robert J. Lillie Introduction to Seismology-KFUPM Marshak, EARTH  (Norton, 2005)
Axis of the oceanic ridge is  offset  by transform (strike-slip) faults which produce lateral displacement.  Ridges and rifts indicate movement . Earthquakes at Mid-Ocean Ridge System Introduction to Seismology-KFUPM
Transcurrent Fault Model ,[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM
Transform Fault Model ,[object Object],[object Object],[object Object],Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM Fig 7.22 of Lillie
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM
Introduction to Seismology-KFUPM

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ÖNCEL AKADEMİ: INTRODUCTION TO SEISMOLOGY