"Thousands of Californians received earthquake warnings on Thursday after a 4.7-magnitude tremor shook Northern California. The US Geological Survey (USGS) issued a ShakeAlert after the quake struck at 4:49am PT (7:49am ET), about 70 miles offshore of Petrolia. ShakeAlert messages are triggered when seismic sensors detect a quake of magnitude 4.5 or higher expected to cause significant shaking. The epicenter was located 190 miles west of Chico, a city of about 121,000 residents, and 65 miles west-southwest of Fortuna, which has roughly 12,000 residents."
"Seismic data suggested it struck along the Cascadia Subduction Zone, a 700-mile-long, dangerous fault stretching offshore from Northern California to Vancouver Island, Canada. The Cascadia Subduction Zone has historically produced 8.0 or larger magnitude earthquakes every 400 to 600 years, with the last striking in 1700. This suggests the 'sleeping giant' is poised for another big one soon. The USGS reported shaking in Eureka, Indianola and Kneeland in northern California, along with towns to the south, including Hacketsville and Rio Dell."
A 4.7-magnitude tremor offshore Northern California prompted ShakeAlert warnings early Thursday. The USGS located the epicenter about 70 miles offshore of Petrolia, 190 miles west of Chico and 65 miles west-southwest of Fortuna. Residents in nearby communities reported feeling the shaking. Seismic data indicated the event occurred along the Cascadia Subduction Zone, a 700-mile fault from Northern California to Vancouver Island. The zone has produced 8.0+ quakes every 400–600 years, last in 1700. No injuries or damages were reported. Modeling shows a future 8.0+ quake with sea-level rise could sink coastal land up to 6.5 feet, severely affecting portions of WA, OR and CA.
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