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The earliest known earthquake in the U.S. state of California was documented in 1769 by the Spanish explorers and Catholic missionaries of the Portolá expedition as they traveled northward from San Diego along the Santa Ana River near the present site of Los Angeles. Ship captains and other explorers also documented earthquakes.
Catalogs of all southern California events recorded since 1932 can be accessed elsewhere. The earthquakes which are listed here are marked with colored squares indicating magnitude. The scale is as follows: Under magnitude 4.5. Magnitude 4.5 to 5.4.
A magnitude 4.5 earthquake struck in Los Angeles, about 10 miles east of the Los Angeles Civic Center, late at night on September 18. It was widely felt across the region, even as far south as San Diego, and was followed by several aftershocks.
The magnitude 7.9 Fort Tejon earthquake (1857) shook 631 times more intensely than did either of the magnitude 5.1 earthquakes in La Habra (2014) and Ojai (2023). The Tejon quake also released 15,849 times the energy than did either of the two smaller quakes.
YearDateLocationTime2023Aug 20Ojai ‡‡2:41pm2014Mar 28La Habra ††9:09pm2008Jul 29Chino Hills **4:04am1994Jan 17Northridge4:31amJul 25, 2019 · But along with familiar names -- like Loma Prieta and Northridge -- that evoke frightening memories, there are thousands of earthquakes each year in California that are too small to be felt. So,...
- Jonathan Lloyd
Nov 22, 2021 · The 1971 San Fernando earthquake struck to the northwest of Los Angeles with an estimated magnitude of 6.6 on the Richter scale. There were widespread infrastructure failures in particular the various healthcare facilities were damaged to a significant extent.
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In 1980, LA Area, California had 1 quake of magnitude 5.3, 1 quake of magnitude 4.9, 58 quakes between 3.0 and 4.0, and 869 quakes between 2.0 and 3.0. There were also 2668 quakes below magnitude 2.0 which people don't normally feel.
