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GEOSYNTEc CONsuLTAN- s <br />Dr. Hari Sharma, P.E., G.E. <br />22 January 2001 <br />Page 3 <br />active faults and earthquake zones in California. The relevant studies include a joint <br />study by the California Department of Conservation Division of Mines and Geology <br />(CDMG) and United States Geological Survey (USGS) [CDMG/USGS, 1996], an <br />update of that study by Petersen et al. [1997), the Mualchin and Jones [ 1992] study <br />supported by California Department of Transportation (Caltrans), and the Jennings and <br />Saucedo [ 1994] map of active and potentially active faults and earthquake zones in <br />California and adjacent areas. <br />Significant active and potentially active faults and seismic source zones <br />within 100 miles (160 km) of the project site as identified in our study are listed in <br />Table 1. Maximum Credible Earthquake (MCE) Moment Magnitudes (Mw) assigned to <br />each fault are from CDMG/USGS [ 1996] except for the Hayward fault, where the most <br />recent magnitude estimate from Petersen et al. [1997] were used. For faults for which <br />Mw estimates were not available from the CDMG/USGS [1996] and Petersen et al. <br />[ 1997] studies (Antioch fault, Foothills fault zone), data from the study by Mualchin and <br />Jones [ 1992] study were used. <br />Maximum Probable Earthquake (WE) Moment Magnitudes assigned to <br />each fault are based on seismic geology data published in the above cited studies (fault <br />segmentation data and slip rates). For the San Andreas, Great Valley and Foothills fault <br />systems, the MME Mw estimate was adjusted to account for historic seismicity. In <br />particular, Mw 7.9 was assigned to the San Andreas fault system based upon the 1906 <br />San Francisco earthquake, Mw 6.4 was assigned to the Great Valley blind thrust fault <br />system based upon the 1983 Coalinga earthquake and Mw 6.0 was assigned to the <br />Foothils Fault system based upon the 1975 Oroville earthquake. Site -to -source <br />distances listed in Table 1 are, with the exception of the Great Valley blind thrust fault <br />system, from the Jennings and Saucedo [ 1994] map. The site -to -source distance of 21 <br />mi (37 lan) for the Great Valley blind thrust fault system is from CDMG/USGS [1996]. <br />Also listed in Table l are the strong ground shaking duration (DS) and Peak <br />Horizontal Ground Acceleration (PHGA) estimates for the MPE and MCE. Both <br />estimates are for a hypothetical bedrock outcrop at the geometric center of the Forward <br />PAP)W iCAWPWMI CALIF- WCIFOR WARDIFOR-HAZ. DOC <br />