Federal dam regulators are ordering the biggest reservoir in Santa Clara County to be drained because of earthquake risk. FEMA announced the Phase 1 rollout of the National Risk Index, a new online resource that helps illustrate communities most at risk from natural hazards. At a Glance. Visit our COVID-19 page and coronavirus.gov for the latest updates on the pandemic response. Close by the city is the Calaveras fault, which winds through eastern Santa Clara county. Cupertino, CA has a very high earthquake risk, with a total of 3,401 earthquakes since 1931. The level of risk was based on the probability of a magnitude 5.0 earthquake in each place. Santa Clara County water officials have been ordered to drain the reservoir by Oct. 1. Santa Clarita has had: (M1.5 or greater) 1 earthquake in the past 24 hours 12 earthquakes in the past 7 days; 32 earthquakes in the past 30 days; 335 earthquakes in the past 365 days The risk of the Anderson Dam collapsing during an earthquake is "unacceptably high." The Santa Clara Valley Water District says the order will deplete groundwater and harm endangered steelhead trout. The biggest reservoir in Santa Clara County must be completely drained starting October 1st due to the risk of its dam collapsing in a major earthquake, according to the Federal Energy Regulatory Commission. Most earthquake fault zones serve as a general guide of a broader area where potential hazards can exist, meaning that every parcel located within a highlighted area is not necessarily at risk … The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. The fault divides into three segments, each with different characteristics and a different degree of earthquake risk. People stroll along the shoreline of Lake Elizabeth in Central Park … Anderson Reservoir is currently limited to about 58% of its capacity due to seismic concerns (see News and Updates tab below for current operating capacity), costing Santa Clara County valuable drinking water resources. We'll hear what's next for It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). While these faults contribute to San Jose earthquake risk, the movement of these intersecting faults relieve the grinding between the Pacific and North American plates. And it's not just Silicon Valley at direct risk of a major earthquake. San Jose is the largest city on the north San Andreas Fault Line. 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