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LLNL Emergency Management Plan (EPlan) <br />Rev 27 <br />January 2022 <br /> <br /> 19 <br />Earthquakes <br />A major earthquake is a credible disaster caused by a natural phenomenon that is likely to <br />involve the entire Laboratory and the entire surrounding community. Hazard mitigation at LLNL <br />is achieved by complying with building codes, applying good engineering and housekeeping <br />practices, and providing training programs required for managers and workers. LLNL’s approach <br />to responding to a severe event is discussed in Section 1.3.3 of this Emergency Plan. <br />The Livermore valley is bounded in part by active faults (Figure 1.3). 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 1.3, 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 1.3 Active and Potentially Active Faults in the Vicinity of Site 200