Do Cycles of Stronger Earthquakes on Bay Area Faults Pre-date Written Records?
USGS geologists David Schwartz and Jim Lienkaemper, who will preside over this session, will discuss their research at 10:00 a.m. on Wednesday, April 19. Along with colleagues, they present information on the timing of large earthquakes in the Bay Area between 1600 AD and 2000 AD. Particular interest is focused on the interval period between 1600 and the San Andreas Fault earthquake in 1838. Their research indicates a period between 1670 and 1776 (a maximum interval that could be significantly shorter) during which all three major faults in the Bay Area had large earthquakes. This period of high activity was followed by a period of relative quiescence similar to the quiet period following 1906. It can be inferred that another period of strong earthquake activity will occur again in the Bay Area´s future. THURSDAY April 20: Ground Motion Simulations of 1906 Earthquake: Geophysicist Brad Aagaard will show and discuss his research and simulations of earthquake motion and intensity during
