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GEoSYNWC CONSVLTJ►M <br />Dr. Hari Shama, P.E., G.E. <br />22 January 2401 <br />Page 4 <br />landfill site. The PHGA estimates were obtained using the Abrahamson and Silva <br />[1997] attenuation model. The DS estimates were obtainedM�'6.4 Iv1PE event Abrahamson <br />bison and <br />Silva 119961 duration model. Table 1 Indicates tha <br />Valley blind thrust system at a distance of 21rni (34 kin) induce the <br />MCEg estevebedrock the <br />NTE PHGA at the site. Table 1 further indicates that the M., <br />6.7 Great Valley blind thrust system at a distance of 21mi (34 lan) induces the. highest <br />bedrock MCE PHGA at the site. <br />Table 1 also indicates that the WE and MCE on the San Andreas fault system <br />are characterized by the same Mw 7.9 event at a distance of 70 uu (112 km). This iarge- <br />rnapitude distant event induces the longest duration of strong ground shaking at the <br />site. Given a relatively small difference in the estbnated bedrock PHOA and the <br />relatively large difference in estimated DB, the -Mw 7.9 event on the San Aadreas fault <br />system <br />may be. the most damaging earthquake for the Forward Site: Therefore. the w <br />7.9 event srn the San .Andreas fault system should beconsidered for evaluation of bath <br />WE and MCE design ground motions at the Forward Landfill site along with the <br />appropriate M,w event on the Great Valley blind thrust system. <br />Evaluation of Design Ground Motions <br />Acceleration time histories .g.• ♦. <br />th carulidate <br />ault <br />NTE and MCE eveats (Mw 6.4 WE or U. 6.7 MCE event. at the Great Valley f <br />sy,st:ai a •NTFJMCE M, 7.9 at the San An&c2s <br />GraOre =Ph-ed <br />for <br />in <br />e and deformation walyses at the Yi r Landfill site. GcOSYD100 <br />selected suite of design <br />a r , C r <br />ries, on the basis Of the following <br />•:. ::Fri utime3 .'i•3. ♦ r bas 'i <br />methodology: (j) <br />• a database r <br />. tt 'l. • and t a.a d ar Yt • <br />t style of faulting and develop a reduced database <br />milar to these of &C WE; (ii) SCreCn <br />of timehistories t e recorded in events si <br />the reduced set of accelezafion fime histories based ail the targetduration ofstrong <br />ground r.,� t and ♦ • , <br />responsee acceleration <br />. . against e& a suite of time <br />t r( a.r•a - W.rc r. t r -- <br />acceler <br />target acceler <br />r.AR07MHAIDOC <br />j, -CI 30ZL-T09-Ori <br />ST/SO 39dd S31VIOOSSV DIDOI039 <br />2Ui.J@aUi.2U3 SIMM j WUSS:6 TOOZ SI Rew <br />ZELBE86606 cO:ZT T00Z/Tc/L0 <br />