Tsunami sightings may suggest a possible offshore epicenter. ![]() Believed to have an epicenter on the Raymond Fault, four shocks were felt in a 12-second span that damaged most buildings in the young city of Los Angeles. J 8:15pm-Damaged the bell tower at the San Gabriel Mission with an estimated 6.0M quake. Septem 8pm-Felt in the Los Angeles region, an estimated 5.5M quake with an epicenter in the Santa Monica Bay. Strong earthquakes continued to rock the region through Febuary, 1813. A tsunami was also reported at Refugio Canyon near the northwest end of Santa Barbara Channel. Heavy damage was also reported at Mission San Buenaventura (Ventura) and at Mission San Fernando.Īn inland epicenter in present-day Santa Barbara or Ventura Counties is possible, but a reported seismic seawave responsible for damaging a Spanish ship anchored 61km off the coast of Santa Barbara may indicate an offshore epicenter is more likely. Considerable damage also occurred at Mission Santa Inez near present-day Solvang, but not as severe as at the other two missions. It has been over 150 years since this segment has had a 7.0+M quake!ĭecem 10am-Potentially triggered by the Wrightwood quake two weeks earlier, this was believed to be two quakes-one at 10am the other at 10:15am-both with an estimated 7.0M and a probable epicenter located offshore, possibly in the Santa Barbara Channel.ĭamage to the church at Mission Santa Barbara was total and Mission Purisma Concepcion near present-day Lompoc was nearly completely destroyed. Damage was also sustained at Mission San Gabriel.īased on scientific evidence, it is believed that five 7.0+M quakes have occurred along the Wrightwood segment of the San Andreas Fault in the last 500 years: 1857 (Fort Tejon), 1812, 1690, 1610, and 1470. Possible surface rupture of 170km occurred from Tejon Pass to Cajon Pass. Based on scientific evidence, it is believed that the epicenter was actually along the Mojave segment of the San Andreas Fault at Wrightwood with an estimated 7.5M. ![]() Lisa Grant, UC Irvine professor, and geologists at UCI believe that the quake was actually located in an underground fault in the San Joaquin Hills, that it uplifted the Orange County coastline by as much as 11ft., and that it actually was a 7.3M.ĭecem 7am-Originally believed to have an epicenter close to San Juan Capistrano, where the mission church collapsed killing 40 native Americans attending mass. The estimated 6.0M quake was followed by at least a dozen aftershocks through August 3rd, with three violent shocks reported during the afternoon and evening of August 2nd (according to Crespi). J 4pm-Felt by members of the Portola Expedition in the Los Angeles basin-specifically the Santa Ana River area about 50km SE of Los Angeles-as noted in the diary of Father Juan Crespi.
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