Laserfiche WebLink
LLNL Emergency Management Plan(EPlan) <br /> Rev 26 <br /> January 2021 <br /> 122 OU'N '121 N:N <br /> BCON 38 KN <br /> q� 4 <br /> LL N L <br /> • , <br /> x <br /> k <br /> 57 3 N 37 X N <br /> 12200'N 121 30 N <br /> Figure 1.2 Active and Potentially Active Faults in the Vicinity of Site 200 <br /> The earthquake faults of greatest threat to LLNL's Site 200 and Site 300 are the Calaveras and <br /> Greenville faults, which are both estimated to be capable of producing earthquakes in the <br /> magnitude 6.5 to 7 range (i.e., similar to the size of the 1989 Loma Prieta earthquake). These two <br /> faults make the greatest contribution to the seismic hazard at Site 200,particularly at frequencies <br /> of ground shaking of about 1 Hz and above that would be the most damaging to buildings at the <br /> sites. For example, a magnitude 5.8 earthquake (followed by a magnitude 5.4 aftershock) on the <br /> Greenville Fault in 1980 produced high frequency shaking having an estimated peak acceleration <br /> of about 0.3 g (g is the acceleration due to gravity) and some instances of significant structural <br /> damage at Site 200. Comparable high frequency shaking would not be experienced from <br /> earthquakes on larger faults of the San Andreas system (i.e., San Andreas, Hayward-Rogers <br /> Creek, San Gregorio). Rather, these faults would produce relatively large low-frequency ground <br /> motions of longer duration. For example, the 1989 Loma Prieta earthquake on the San Andreas <br /> Fault produced a peak ground acceleration of 0.1 g at Site 200, but caused no damage. <br /> 19 <br />