At a Glance. Cupertino, CA has a very high earthquake risk, with a total of 3,401 earthquakes since 1931. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). And it's not just Silicon Valley at direct risk of a major earthquake. 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. 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. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. San Jose is the largest city on the north San Andreas Fault Line. Federal dam regulators are ordering the biggest reservoir in Santa Clara County to be drained because of earthquake risk. The largest earthquake within 30 miles of … 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. People stroll along the shoreline of Lake Elizabeth in Central Park … Close by the city is the Calaveras fault, which winds through eastern Santa Clara county. Feds order Santa Clara County’s biggest reservoir to be drained due to earthquake collapse risk Failure if reservoir is full could send 35-foot wall of water into Morgan Hill We'll hear what's next for SAN JOSE, Calif. - Santa Clara County released new COVID-19 quarantine guidance on Monday, which shortens the length of quarantine from 14 to … The risk of the Anderson Dam collapsing during an earthquake is "unacceptably high." Visit our COVID-19 page and coronavirus.gov for the latest updates on the pandemic response. The Santa Clara Valley Water District says the order will deplete groundwater and harm endangered steelhead trout. 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 level of risk was based on the probability of a magnitude 5.0 earthquake in each place. 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. The USGS database shows that there is a 99.65% chance of a major earthquake within 50km of Cupertino, CA within the next 50 years. 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