It released at least twice as much energy as the San Francisco earthquake of 1906 and was felt on land over an area of almost 502,000 square miles (1,300,000 square km). Note the location of the plate boundary, which marks the Aleutian … The Great Alaska Earthquake, also known as the Good Friday quake, left behind a graphic tutorial in the power of plate tectonics, which was then still mostly a theory. The horizontal sliding of the Pacific Plate relative to the North American Plate, causes earthquakes along the San … Prior to March 27, 1964, the concept of plate tectonics was just a theory, though one gaining acceptance. Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths.. Alaska earthquake of 1964, earthquake that occurred in south-central Alaska on March 27, 1964, with a moment magnitude of 9.2. Two of these moving plates meet in western California; the boundary between them is a zone of faults, the principal one being the San Andreas fault. Wow a 9.2 Magnitude earthquake - now that is big! On Good Friday, March 27, 1964, at 5:36 p.m. local time, the earth began to shake in the subduction zone in the Prince William Sound in Alaska. Two types of tsunami were produced as a result of this massive quake. The 1964 Alaskan earthquake, also known as the Great Alaskan earthquake and Good Friday earthquake, occurred at 5:36 PM AKST on Good Friday, March 27. Four out of five earthquakes in the United States occur in Alaska. The 1964 earthquake in Anchorage, Alaska occurred as a result of an oceanic plate sinking under a continental or land plate. The large magnitude event (9.2) was the largest earthquake recorded in the U.S. during this century, and occurred on Good Friday in 1964. After the 1964 megathrust earthquake, three-quarters of the Aleutian subduction zone ruptured in a span of eight years. Perspective view of the Pacific Plate being subducted beneath the North American plate at the Alaska-Aleutian Subduction zone. The March 27, 1964, earthquake was accomp anied by crustal deformation-including warping, horizontal distortion, and faulting-over probably more than 110,000 square miles of land and sea bottom in south-central Alaska. The U.S. Geological Survey reports that: The earthquake caused rivers, lakes, and other waterways to slosh … The pink highlighted region shows the part of the megathrust fault (plate boundary) that slipped in 1964 during the Great Alaskan Earthquake. White arrows show relative plate … (2) Intermediate depth seismicity (below 20 miles) occurs in the so-called Benioff Zone, where the subducting Pacific Plate descends towards the mantle beneath the North American Plate. 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