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LLNL Emergency Plan <br />Rev-23 <br />October 2017 <br /> <br /> 19 <br />The Livermore valley is bounded in part by active faults (Figure 1.2). The Greenville Fault zone <br />bounds the Livermore valley on the northeast. The northeast-trending Las Positas Fault zone <br />forms the boundary of the southeast corner of the valley. The Mount Diablo Fold and Thrust <br />Belt, north and west of the site, includes the Williams and Verona faults southwest of Livermore <br />valley and the Livermore and Springtown structures in the immediate vicinity of the LLNL site. <br />The San Andreas Fault system includes the faults listed as well as others along western <br />California. In Figure 1.2, the teeth indicate dip direction of thrust and reverse faults. The Mount <br />Diablo Fold and Thrust Belt and the Livermore Fault are blind faults; traces shown represent the <br />buried upper tips of these faults. <br /> <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