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GEoSYNTEC CONSULTANTS <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, 19961, 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 (M,,) 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 /> MH, estimates were not available from the CDMG/ ]SGS [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 (MPE) 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 MPE M,w estimate was adjusted to account for historic seismicity. In <br /> particular, MH, 7.9 was assigned to the San Andreas fault system based upon the 1906 <br /> San Francisco earthquake, M,w 6.4 was assigned to the Great Valley blind thrust fault <br /> system based upon the 1983 Coalinga earthquake and M,,, 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 km) for the Great Valley blind thrust fault system is from CDMG/USGS [1996]. <br /> Also listed in Table 1 are the strong ground shaking duration (D.,) 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 /> P:I PRJ2l CA WPWMI CALIF-WCI FOR WARD I FOR-HA Z.DOC <br />