Laserfiche WebLink
GEoSmrEc CoNsvLTA rrs <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 Califomia 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 (M,r) 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 /> M,,. 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 MPE 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, M,r 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 OroviIle earthquake. Site-to-source <br /> distances listed in Table I 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 )an) for the Great Valley blind thrust fault system is from CDMG/USGS [1996). <br /> Also listed in Table I are the strong ground shaking duration (DO 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.'IPRJ2IC.4WPWAPC.ILIF-WC1FORW.4RD"R-H,4Z.DOC <br />