![]() The earthquake also triggered a tsunami, leading to further victims and destruction. Earthquakes in the United States of America since 1950 The strongest earthquake in the United States of America happened on in the Alaska region with a magnitude of 9.2 on the Richter scale. A total of around 3,000 people died as a result of debris and fires. Due to the lack of technology at that time, only estimated values between 7.7 and 8.4 are available for the magnitude. Probably the best-known, and so far most severe earthquake in the USA took place in San Francisco in 1906. The resulting earthquakes often reach magnitudes of 6.7 on the moment magnitude scale. In other places, the two plates become entangled and break away jerkily after increasing pressure. Because the lithospheric plates in this region are only a few miles thick, minimal but steady movement is possible in some places. In this way, Los Angeles and San Francisco come closer by an average of 2.4 inches per year. As the Pacific plate moves north, the North American plate drifts south. Los Angeles lies on Pacific plate, while San Francisco lies on North American continental plate. Here the Pacific plate with its oceanic crust meets under the plate of North America, causing regular tectonic stresses in the subduction zones.Īt the Earth's surface, this faulting is best observed in the movement of both plates between Los Angeles and San Francisco. All three regions are part of the Pacific Ring of Fire. 'Or, like the quakes in Turkey, they can also go at rapid succession. ![]() Much better known are the earthquakes along the densely populated San Andreas Fault, which runs from north to south over 1000 kilometers through California. 'If Saddle Mountain and Seattle faults went together it would be on par with the 1906 earthquake in San Francisco,' Black said. occur in the sparsely populated areas along the Gulf of Alaska and the chain of islands in the Bering Sea. Geological Survey, USGS Most earthquakes within the U.S.
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