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The Chino Fault and Whittier Fault are the two upper branches of the Elsinore Fault Zone, [2] which is part of the trilateral split of the San Andreas Fault system. The right-lateral strike-slip fault has a slip rate of 1.0 millimeter/year and is capable of producing anywhere from a M w 6.0 to a M w 7.0 earthquake.
The San Jacinto Fault Zone and the San Andreas Fault (SAF) accommodate up to 80% of the slip rate between the North American and Pacific plates.The extreme southern portion of the SAF has experienced two moderate events in historical times, while the SJFZ is one of California's most active fault zones and has repeatedly produced both moderate and large events.
A multi-year study published in 2018 suggests a connection between the Elsinore fault and other fault lines farther south, in Mexico: "...observations of the Yuha Desert and Salton Trough suggest that the 2010 M7.2 El Mayor ‐ Cucapah earthquake rupture, the Laguna Salada fault in Baja California, Mexico, and the Elsinore fault in California ...
Probabilistic seismic hazard map. 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.
A full fault rupture, estimated to be around a 7.5 magnitude, could kill between 3,000 and 18,000 people, according to US Geological Survey and Southern California Earthquake Center.
The 1899 San Jacinto earthquake occurred on Christmas morning (December 25) at 04:25 local time in Southern California. The estimated moment magnitude 6.7 earthquake had an epicenter located 10 miles southeast of San Jacinto. The earthquake had a maximum Mercalli intensity of IX (Violent). Severe damage occurred, amounting to US$50,000 (1899 ...
UTC time: 1999-10-16 09:46:45: ISC event: 1643776: USGS-ANSSComCat: Local date: October 16, 1999 (): Local time: 02:46:45 PDT [1]: Magnitude: 7.1 M w [1]: Depth: 20 km (12 mi) [1] Epicenter: 1]: Type: Strike-slip [2]: Areas affected: Southern California United States: Total damage: Limited [3]: Max. intensity: MMI VII (Very strong) [2]: Casualties: 4–5 injured [2] [4]: The 1999 Hector Mine ...
The earthquakes this week were located slightly north of the Ortigalita fault, in an area without any mapped fault lines at the surface. Which parts of Stanislaus County are most at risk for ...