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Gcoftwmc CoHsuLTANn <br />0- G.F. <br />Dr. lien Sharma, P.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'Iranspatta ion (Caltrans}, and the Jennings and <br />Saucedo [1994] map of active and potentially active fatelts .arid earthquake zones <br />in <br />Cali.fiomia and adjacent areas. <br />Significant active and potentially active faults and seismic source zones <br />within 100 miles (160 1=) of the project site as identified in our study are listed in <br />Table 1- Maximum Credible Earthquake (MCE) Moment Ma&tudes (M "). assigned to <br />each fault are from CDMGIUSGS [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 GDMG/USGS 11996] and Petersenet al. <br />[1997] studies (Antioch Foothills It ), data fiorn the study by Mualcbin and <br />Jones [1992]. study were used. <br />Maximum Probable Earthquake (bVB) .M-oment etudes assigmed 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 Aridreas,'Great'Valicy-and Foothills fault <br />.,,systems, the NSE Mme, estimate -ryas adjusted to account for historic seismicitY. In <br />particular, Mme, 7.9 was assigned to the San Andreas fault system'based, upon the '1906 <br />."Sara, Francisco earthquake, MW 6.4 was assigned to the Great Valley blind tt est fault <br />system based upon the 1983 Coalinga earthquake and MW 6.0 was assigned t.o the <br />iFoothils Fault system based upon the 1975 C?toville earthquake. Site to -source <br />distances listed in Table -1 are, with the exception of the Great Valley blind thrust fault <br />[1994] map. The site -to -source distance of 21 <br />system, from the Jennings and S <br />mi (37 km) for the Great Valley blind thrust fault system is from CDIVSG/USGS [1996]. <br />Also listed in Table 1 ate the strong ground shaking duration (W and Peak <br />Horizontal Ground Acceleration (PHGA) estimates for the WE and MCS'.. Both <br />estimates are for a hypothetical bedrock outcrop at the geometric center of the Forward <br />P, PR12ACAWPLVAACAIIF-WCVONWARDIFOA-HAZDW <br />0 <br />A2 <br />F -d 90ZL-I09-OIS 2UIJ66ui2u3 <br />r.T /+,n 7nHJ C71HT'')nggH ")Tnn-i *:in <br />s imal Wd�fi 6 T �0 91 sew <br />�f=1!�f=!�!=�G1 �, !=Gi :7T TGIfl7./T'•-'/1 G1 <br />