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The San Joaquin Fault is a seismically active geological structure in the California Central Valley. [1] East of the San Joaquin fault there is a flow pattern of alluvium that has been reported to be a mud flow. [2] This flow pattern was deposited in the early Holocene or the late Pleistocene age. [3]
Rancho San Joaquin later became part of the Irvine Ranch. [8] Mexican Rancho Niguel was located in the southeastern section of the hills. The San Joaquin Hills blind thrust may be the source of the earliest recorded earthquake in California, a large earthquake felt in what is now northern Orange County on July 28, 1769, by Gaspar de Portolá. [9]
The California Coast Ranges extend from the Oregon line southward 600 miles (970 km) to the Santa Ynez River. The mountains are drained by the Russian, Eel, Mad and Klamath rivers which tend to follow faults and folds. Per square mile of drainage, the Eel River has the highest suspended sediment load of any river in the US, exceeding the ...
The San Andreas Fault Zone runs parallel to the range at the base of its western slope, on the eastern side of the Carrizo Plain, while the Antelope Plain, location of the enormous Midway Sunset, South Belridge, and Cymric oil fields, lies to the northeast. Peaks within the Temblor Range average about 3,500 ft (1,100 m) above sea level. [2]
The probability of a serious earthquake on various faults has been estimated in the 2008 Uniform California Earthquake Rupture Forecast. According to the United States Geological Survey, Southern California experiences nearly 10,000 earthquakes every year. [3] Details on specific faults can be found in the USGS Quaternary Fault and Fold Database.
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time ...
The canyon was most likely formed by San Diego Creek cutting through the rising San Joaquin Hills over a span of about 1.22 million years. At some point, however, the creek changed course, and the water gap it had formed was walled off by the mountains and became a separate watershed. The gradient of the drainage divide separating Laguna Canyon ...
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.