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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. Ship captains and other explorers also ...
1700 Cascadia earthquake; 1769 earthquake; 1812 San Juan Capistrano earthquake; 1812 Ventura earthquake; 1838 San Andreas earthquake; 1857 Fort Tejon earthquake; 1868 Hayward earthquake; 1872 Owens Valley earthquake; 1892 Laguna Salada earthquake; 1892 Vacaville–Winters earthquakes; 1898 Mare Island earthquake; 1899 San Jacinto earthquake ...
The earliest reported San Andreas Fault earthquake in California was on July 28, 1769, at the future site of the Mission Vieja. The earthquake was recorded by members the Portolá Spanish expedition charting a land route from San Diego to Monterey. Ship captains in California and other explorers also documented earthquakes.
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Historical earthquakes is a list of significant earthquakes known to have occurred prior to the early 20th century. As the events listed here occurred before routine instrumental recordings — later followed by discoveries of Earth's tectonic plates, [1] seismotomography imaging technique, [2] observations using space satellites from outer space, [3] artificial intelligence (AI)-based ...
One more thing Southern California is known for: earthquakes. Yet for a long time, and to the great relief of millions, the many active faults that claw and tear through the earth have been ...
The 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in Southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the M s scale and 6.6 on the M w scale, and a maximum Mercalli intensity of XI (Extreme).
Of particular concern are signals of massive earthquakes in the region’s geologic history. Many researchers have chased clues of the last “big one”: an 8.7-magnitude earthquake in 1700.