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The Franciscan Complex or Franciscan Assemblage is a geologic term for a late Mesozoic terrane of heterogeneous rocks found throughout the California Coast Ranges, and particularly on the San Francisco Peninsula. It was named by geologist Andrew Lawson, who also named the San Andreas Fault that defines the western extent of the assemblage. [1]
A map displaying each of the seven major faults in the San Francisco Bay Area, and the probability of an M6.7 earthquake or higher occurring on each fault between 2003 and 2032 The slip on the San Andreas Fault which caused the 1906 San Francisco earthquake was visible in Wrights Tunnel along the South Pacific Coast Railroad after the earthquake
The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert.The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse ...
Calaveras Fault: 120: San Francisco Bay Area, California, United States: Dextral: Active: 1911 Morgan Hill (M6.5), 1984 Morgan Hill (M6.2) Cascadia megathrust: 1000: West coast of United States – Oregon & Washington Vancouver Island, Canada: Subduction zone: Active: 1700 Cascadia (M9.0) Central African Shear Zone: 4000: Central Africa: Rift ...
U.S. Geological Survey map showing the trace of the San Gregorio Fault in yellow, lower center. The San Gregorio Fault is an active, 209 km (130 mi) long fault located off the coast of Northern California. The southern end of the fault is in the Pacific Ocean just south of Monterey Bay, and the northern end is about 20 km northwest of San ...
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 Coast Range Geomorphic Province is a portion of coastal California, United States.This orogen geomorphic province constitutes a barrier between the Pacific Ocean and the San Joaquin Valley which trends northwest from Point Conception to the border with Oregon, with a significant break in the San Francisco Bay Area by the basins of the Sacramento River and San Joaquin River that discharge ...
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.