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A map by the California Geological Survey shows faults near the Lake Almanor area in Plumas County, where a magnitude 5.5 earthquake struck Thursday, May 11, 2023, followed by a magnitude 5.2 ...
The fault runs offshore along the West Coast from Northern California to northern Vancouver Island in Canada. It is capable of producing magnitude-9.0 earthquakes and tsunami waves about 100 feet ...
A map displaying each of the seven major faults in the San Francisco Bay Area, and the probability of an M6.7 earthquake or higher occurring on each fault between 2003 and 2032 The slip on the San Andreas Fault which caused the 1906 San Francisco earthquake was visible in Wrights Tunnel along the South Pacific Coast Railroad after the ...
Large earthquakes also occurred near the junction in northern California in previous Decembers, according to the geological survey. There were two, a 6.1 and 6.0, near Petrolia in 2021 and a 6.4 ...
The reported epicenter of the 2014 South Napa earthquake was located beneath the Napa Valley Marina. The West Napa Fault is a 57 km (35 mi) long geologic fault in Napa County, in the North Bay region of the San Francisco Bay Area in northern California. It is believed to be the northern extension of the Calaveras Fault in the East Bay region.
The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The southern end of the fault is in the Pacific Ocean just south of Monterey Bay , and the northern end is about 20 km northwest of San Francisco , near Bolinas Bay , where the San Gregorio intersects the San Andreas Fault .
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
The maximum credible earthquake expected to be generated from the Healdsburg Fault is estimated to be about 7.5 on the Richter scale. [1] The last major event in Sonoma County were the 1969 Santa Rosa earthquakes, a magnitude 5.6 and 5.7 doublet that occurred on this fault. The county anticipates similar events every 20–30 years.