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's-r- [7, I,;rAirr:.icrr or civir. rs:t.IN;.rniNG ~~ Junc 8, I!!78 . ay .5 11r. J.C llei:inley ACitS USNitC Washingt<>n, ll.C. 20555 Dea: fir. !4cKi nl ey, I an enelur.in;; ny calculationr. for peak ground acceleration at the Diablo Caayon Site in California. To save time, I chose to dc ri.; the results you requerted from the existin;. report to ACRS by Anderr - and 1ri funac (1977). Consequently, the following results also repre. it the a:r.plitta'es of Uniform ilish Absolute Accelcration Spectra r.t t::e natu-al period of single-degree-of-freedota system equal to 0.N see. In our previous t.ork (Anderson and Tri fenac,1971), we erploye ' four scis::ici ty 1 ode: Is for the a:ca betscen 119*W to 123'W and 33. * : 37'N. Ther.e ecdels (A, C, C, il and li) represent different i n te rp re t.:- m tions of 1m:rible int. ore seismic activity nent the liiablo Canyon Si t... Detailed diseu.;sion and descriptioiis of these models are cochtaed i:. Anderson and 1 rift:nac (1977) rcport. Tables I and 11 su:=.aari;c ti:e esscnt.ial charneteristics of these models. Figures ! and 2 present the r.mplitudes of Uniform Risk Absolute accelcration spectra at T = 0.0.1 sec. Figure 1 is hased on the asstr r-tion that carthquakes can be nedeled by a Poisson sugucnce in tinc. Figio e.! piesents results for the "I.i t eral :ledel"; i.e., where i t is assumed that all events in Tahic 11 will occur during the next 50 year =. Iloth fir.urcs are based on sal (interiiEtiTate site condit ions, see An.!c:st n and Tri funne, 1977). You re quested the estimates of peak greund acceleration that s:cu!J have the probability of at least one exceedance equal to 0.30 and !cr the t ine windo e of 10 years. These accelerations cori spond to the prohahi1ity of at least one exeec. dance equaI to 0.3f during a 50 yc.4:- time winthw for which the calculations are readily available. Table !!I summari en the resul13.. ~ 8608250307 860801 PDR FOIA HOUCH96-391 PDR F88 -A w - e rwm als $-/
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