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The Cascadia subduction zone is a 960 km (600 mi) fault at a convergent plate boundary, about 100–200 km (70–100 mi) off the Pacific coast, that stretches from northern Vancouver Island in Canada to Northern California in the United States. It is capable of producing 9.0+ magnitude earthquakes and tsunamis that could reach 30 m (98 ft).
Seismogram of the earthquake. The earthquake measured 6.4 on the moment magnitude scale, and had a maximum Mercalli intensity of VIII (Severe). It came exactly a year after a 6.2 magnitude earthquake struck onshore in the Cape Mendocino area on December 20, 2021, causing only minor damage.
Since the three damaging earthquakes that occurred in the American Midwest and the United States East Coast ( 1755 Cape Ann, 1811–12 New Madrid, 1886 Charleston) were well known, it became apparent to settlers that the earthquake hazard was different in California. While the 1812 San Juan Capistrano, 1857 Fort Tejon, and 1872 Owens Valley ...
A magnitude 4.1 earthquake was reported Wednesday morning at 9:29 a.m. seven miles from Oakley, Calif., according to the U.S. Geological Survey.
A preliminary magnitude 5.5 earthquake occurred off the Northern California coast on Sunday. The third notable earthquake of the past six months hit Northern California Sunday, May 21. Around 11: ...
Brianna Taylor. May 12, 2023 at 3:59 PM. Some residents felt the moderate earthquake Thursday that jolted parts of Northern California while others were completely oblivious to the buildings that ...
The 1989 Loma Prieta earthquake occurred on California's Central Coast on October 17 at 5:04 p.m. local time. The shock was centered in The Forest of Nisene Marks State Park in Santa Cruz County, approximately 10 mi (16 km) northeast of Santa Cruz on a section of the San Andreas Fault System and was named for the nearby Loma Prieta Peak in the ...
July 22, 2022 at 10:29 PM. A small earthquake rattled Northern California on Friday evening when a magnitude 4.2 temblor shook in Butte County. The quake struck at 6:41 p.m. about 5 miles ...