![]() It divides California into two in which San Diego, Los Angeles, and Big Sur are on the Pacific Plate, whereas Sacramento, San Francisco, and the Sierra Nevada are on the North American Plate. This is measured according to the Richter scale.The California Earthquake Authority wrote on their website that the San Andreas Fault line is one of the largest in the world that runs more than 800 miles from the Salton Sea to Cape Mendocino. The magnitude rating of an earthquake is a measurement of how much energy is released. When a major earthquake occurs, there are usually several smaller earthquakes, called aftershocks that follow. Magnitude 2 earthquakes occur near Parkfield regularly. This drilling revealed that slippery clay may be the reason for some of the activity. In 2004 work began to drill a hole two miles deep into the San Andreas Fault. Parkfield has become the center for earthquake research. Most of the population in California live on the west side of the San Andreas Fault. It looks like a valley where the Pacific plate and North America plate meet. The San Andreas Fault can be seen from space. In 1989 the Loma Prieta earthquake, with a magnitude of 6.9, located near Santa Cruz, killed 63 deaths in San Francisco Bay's area.Īn earthquake in 2004 at Parkfield was felt across California. In 1957 another San Francisco earthquake occurred, with a magnitude of 5.7 In 1906 the San Francisco earthquake, with a magnitude of 7.8, located near San Francisco, killed 3000 people. In 1857 the Fort Tejon earthquake, with a magnitude of 7.9, located near Parkfield, killed two people. In 2015 a study revealed that there is a 7% chance that an earthquake with a magnitude of 8 will occur in the next 30 years. In 2008 a study was done that predicts an earthquake with a magnitude of 7.8 along the southern section of the San Andreas Fault would result in $213 billion in damage and likely about 1800 deaths. They refer to an earthquake with a magnitude as greater than 7 as a 'big one'. In 2006 a study revealed that the San Andreas Fault has reached a stress level large enough to cause a magnitude 7 earthquake. The San Andreas Fault located near Parkfield produces a 6 magnitude earthquake on average every 22 years. It is believed that the San Andreas Fault began forming about 30 million years ago in the mid-Cenozoic. The southern section of the San Andreas Fault runs from Bombay Beach to Parkfield. The central section of the San Andreas Fault runs from Parkfield to Hollister. The northern section of the San Andreas Fault runs from Hollister to Daly City, near Muscle Rock. In 1953 the conclusion that the San Andreas Fault could cause such an extensive earthquake was made by Thomas Dibblee, a geologist. It wasn't until the earthquake in 1906 that Andrew Lawson realized that the San Andreas Fault extended into southern California as well. ![]() Andrew discovered the northern zone and the fault got its name after San Andreas Lake. The San Andreas Fault was discovered in 1895 by a UC Berkley professor named Andrew Lawson. The fault line section with the greatest degree of risk passes only 35 miles from Los Angeles. The fault line is divided into three segments, each with different earthquake risk and different characteristics. The San Andreas Fault is a fault line that extends approximately 810 miles along the California coastline. ![]()
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