According to the U.S. Geological Survey (USGS), the deepest earthquakes that occur worldwide are typically located at subduction plate boundaries in the ocean; these can be up to 400 miles underground. Earthquakes are typically much more shallow in the United States. In the U.S., the major San Andreas Fault running along California is up to ten miles deep at certain points. The USGS reports magnitude information for earthquakes occurring worldwide and in the U.S., but the depths of these were not included. However, the earthquake recorded with the greatest magnitude in the U.S. was located in the Prince William Sound of Alaska on March 28th of 1964 – this had a 9.2 on the Richter scale. In fact, nearly all of the greatest U.S. earthquakes occurred in Alaska
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