![]() ![]() ![]() The Aleutian megathrust, where the two plates are being forced directly into one another, is one of the world's most active seismic zones. The Rat Island earthquake had the magnitude of 8.7, and the Sumatra earthquake had the. during the previous ten years, the region shown on the map had on average two magnitude 6 or greater events per year. The earthquake occurred at 51.78 degrees North, 176.64 degrees West. earthquake that happened in Rat Island, Alaska in April 2, 1965. All these events ruptured the boundary between the subducting Pacific and overriding North American plates. The magnitude 8.2 quake was reported Wednesday night, and located just south of the Alaska Peninsula. While the June 2006 sequence of earthquakes was located near the westernmost end of the 1957 rupture zone, the current event was located across the rupture zone boundary at the easternmost end of the 1965 rupture. in the last half century spared Alaska any major damage in a sparsely populated region, officials said. The 1964 Alaska M 9.2 earthquake was the largest of five earthquakes of >M 7. The eastern portion of the 1965 fault zone was reruptured recently in the M7.7 earthquake on November 17, 2003. The westernmost area of the 1957 fault zone was reruptured repeatedly in the 1986 M8. It still caused waves all over the world and killed 3 people. This tsunami was triggered by an earthquake 3,072 miles away in Alaska. Most tsunamis are triggered by an earthquake. 1957 Andreanof Islands earthquake: April 7, 1958: Alaska 7.3 M w 0 1958 Huslia earthquake: July 9, 1958: Alaska: 7.8 M w 5 (tsunami) 1958 Lituya Bay earthquake: August 18, 1959: Montana, Wyoming, Idaho: 7.2 M w 28 + 1959 Hebgen Lake earthquake: March 27, 1964: Alaska: 9.2 M w 143: 1964 Alaska earthquake: February 4, 1965: Alaska: 8.7 M w 0. The August 2 mainshock occurred in the area separating the rupture zones of the 1965 M8.7 Rat Islands earthquake to the west and the 1957 M8.6 Andreanof Islands earthquake to the east. In October of 2014 was when the last tsunami in Hawaii occurred.
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