Intern	Institution	Mentor	Project Title
Safaa Dergham	Cal. State Univ. Long Beach	Sally McGill, Cal State Univ. San Bernardino	Paleoseismic studies of the San Andreas Fault in the San Bernardino area.

Abstract:

Paleoseismic studies of the San Andreas Fault in the San Bernadino Area

A trench across the San Bernadino segment of the San Andreas fault in San Bernadino, California, revealed vertical offsets that provide strong evidence for two surface ruptures in the past 800 years. The vertical average recurrence interval between the two events is about 160 years. Seven radiocarbon dates of detrial charcoal are in correct stratigraphic order and indicate an average sedimentation rate of 5.3 mm/year. In addition, these dates constrain the ages of the individual faulting events. The oldest event occurred shortly after A.D. 1812 and the A.D. 1700 events at Pitman Canyon and Wrightwood. A second trench will be open on another young alluvial fan at this site to further investigate the occurrence of recent earthquakes in this area.

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