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Selection Guide (.pdf)
The Alum Rock October 30, 2007 Earthquake is a prime example of the benefit of site specific earthquake actuated automatic shutoff. Only one (1) facility equipped with ESS instrumentation experienced shaking exceeding the TGO shutoff critiera. That TGO user was the closest ESS instrumented plant to the earthquake focus/epicenter.

Using a 'broadcast' based shutoff system, all the other plants would have shutdown unnecessarily.