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LLNL Emergency Management Plan(EPlan) Rev 26 January 2021 Center Storm Events Database, all of which were rated as FO tornadoes on the Fujita Scale. In San Joaquin County,where Site 300 is located, 18 tornadoes have been recorded since 1950, fourteen of which were F0, two of which were F 1, and two of which had an unknown ranking on the Fujita Scale. The Fujita Scale (F-Scale), or Fujita—Pearson Scale, is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation, where FO represents light damage, F1 moderate damage, F2 considerable damage, F3 severe damage, F4 devastating damage, and F5 incredible damage. Earthquakes A major earthquake is a credible disaster caused by a natural phenomenon that is likely to involve the entire Laboratory and the entire surrounding community. Hazard mitigation at LLNL is achieved by complying with building codes, applying good engineering and housekeeping practices, and providing training programs required for managers and workers. LLNL's approach to responding to a severe event is discussed in Section 1.3.3 of this Emergency Plan. The Livermore valley is bounded in part by active faults (Figure 1.2). The Greenville Fault zone bounds the Livermore valley on the northeast. The northeast-trending Las Positas Fault zone forms the boundary of the southeast corner of the valley. The Mount Diablo Fold and Thrust Belt, north and west of the site, includes the Williams and Verona faults southwest of Livermore valley and the Livermore and Springtown structures in the immediate vicinity of the LLNL site. The San Andreas Fault system includes the faults listed as well as others along western California. In Figure 1.2, the teeth indicate dip direction of thrust and reverse faults. The Mount Diablo Fold and Thrust Belt and the Livermore Fault are blind faults; traces shown represent the buried upper tips of these faults. 18