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. The magnitude was about 7.9. It caused one fatality. 2005 | Bernard Dost Earthquake prediction research is based on understanding the long-term behaviour of faults in the earth crust. The timeline shows its past six major earthquakes, which have an average spacing of 22 years, leading to the prediction that the next such quake would come in the 1980s or early 1990s. The San Andreas Fault is a fault line that extends approximately 810 miles along the California coastline. 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. 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. Of … An estimated 830,000 people died. Note: The two-color EDM at Parkfield has been retired after 20 years of service. Parkfield is located on the San Andreas fault and the town is about half way between San Francisco and Los Angeles. Search Earthquake Catalog.
 The deadliest earthquake known hit Shansi, China on January 23, 1556. 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. 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. Though it is known as the Fort Tejon earthquake, the epicenter is thought to have been located far to the north, just south of Parkfield. First, since 1857, six similar, magnitude 6 earthquakes have hit on the San Andreas fault near Parkfield with apparent clockwork regularity -- one approximately every 22 years. The earthquake caused 26 people dead, 453 injured, and 196633 homeless. This was known as the Parkfield Earthquake Prediction and the Parkfield Earthquake Experiment, conducted by the USGS. 1857 Fort Tejon earthquake: About 217 miles (349 km) were ruptured in central and southern California. The fault line is divided into three segments, each with different earthquake risk and different characteristics. The epicenter was located near Baotou, Inner Mongolia, China. Two deaths were reported. On average, there are 500,000 detectable earthquakes that occur each year. At Parkfield, the plates are not locked in place but slip sideways over time.