The Parkfield Earthquake, magnitude 6.0, shook central California. Finally, at 10:15 in the morning on Sept. 28, 2004, a magnitude-6 earthquake ruptured the Parkfield section of the San Andreas Fault. The USGS Earthquake Hazards Program is part of the National Earthquake Hazards Reduction Program (NEHRP), established by Congress in 1977, and the USGS Advanced National Seismic System (ANSS) was established by Congress as a NEHRP facility. At Parkfield, the plates are not locked in place but slip sideways over time. At this moment, we do have a good knowledge on the location of major active faults in the world, but the time of an event is still hard, if not impossible, to predict. It had a magnitude of Ms 6.4. The USGS has a cluster of instruments at Parkfield to measure changes prior, during and after a moderate sized (M6) earthquake. An estimated 830,000 people died. The first earthquake was recorded in the U.S. at Plymouth, Mass. tsunamis or landslides. Significant Earthquakes Archive. Shaking was felt over most of California, and motion along the fault was 23 feet in places. Moderate earthquakes (magnitude about 6) have occurred on the Parkfield section of the San Andreas Fault at fairly regular intervals-in 1857, 1881, 1901, 1922, 1934, and 1966. Two deaths were reported. Parkfield is located on the San Andreas fault and the town is about half way between San Francisco and Los Angeles. Links: USA, Earthquake, Massachusetts 1687 Oct 20 The first US earthquake on record with significant human consequence was recorded on Aug 31, 1886, with the loss of some 100 lives in Charleston, S.C. Its massive effect spread through many eastern States. On average, there are 500,000 detectable earthquakes that occur each year. All these Parkfield earthquakes have struck in the same area-historical seismograms show that at least the 1934 and 1966 shocks initiated at the same point on the fault. This was known as the Parkfield Earthquake Prediction and the Parkfield Earthquake Experiment, conducted by the USGS. Those records ceased when the missions were secularized in 1834, and from that point until the California Gold Rush in the 1840s, records were sparse. A key area for research on methods of earthquake prediction is the section of the San Andreas fault near Parkfield in central California, where a moderate-size earthquake has occurred on the average of every 20-22 years for about the last 100 years. The San Andreas Fault is a fault line that extends approximately 810 miles along the California coastline. A massive 8.8 earthquake in Chile moved the city of Concepción 10 feet to the west on February 27, 2010. The magnitude was about 7.9. 1857 Fort Tejon earthquake: About 217 miles (349 km) were ruptured in central and southern California. Parkfield earthquake prediction experiment. The tremors quieted, but the Parkfield earthquake hit about three weeks later on the San Andreas. 2005 | Bernard Dost Earthquake prediction research is based on understanding the long-term behaviour of faults in the earth crust. This earthquake occurred on the San Andreas fault, which ruptured from near Parkfield (in the Cholame Valley) almost to Wrightwood (a distance of about 300 kilometers); horizontal displacement of as much as 9 meters was observed on the Carrizo Plain.
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