The Rat Islands form part of the Aleutian Islands, a chain of volcanic islands forming an island arc, that results from the subduction of the Pacific Plate beneath the North American Plate. The Rat Islands event was closely followed by a large tensional outer-rise event of March 30, 1965 (Ms 7.5, smaller star), which was located oceanward of the largest moment release associated with the Rat Islands mainshock rupture. Generally speaking, the magnitude of an earthquake is roughly proportional to the area involved in its faulting. The waveform analysis indicates unilateral rupture from east to west and three large pulses of moment release located along the fault (Beck and Christensen, 1991). The main shock was followed by an earthquake of magnitude 7.6. This plate boundary, the Alaska-Aleutian megathrust, has been the location of many megathrust earthquakes. The Rat Island earthquake of February 4, 1965 (origin time 05h 01m 21.8s, h = 40 km), is one of the largest earthquakes recorded in recent years. Nearly 2 months later, that triggered a tsunami. This region, where the two plates are being forced directly into one another, is one of the world's most active seismic zones. A magnitude 7.6 aftershock struck … The waveform analysis indicates unilateral rupture from east to west and three large pulses of moment release located along the fault (Beck and Christensen, 1991). Each major rupture is labelled with the earthquake's year and a black dot indicating the epicenter for the associated earthquake. With the exception of the Unalaska and Shumagin seismic gaps, all portions of this plate boundary have ruptured in the past hundred year.The great Mw=8.7 Rat Islands underthrusting earthquake (larger star on the above map) of February 4, 1965, ruptured a 600-km segment of the western end of the Aleutian Islands (black solid line). The Rat Island earthquake of February 4, 1965 (origin time 05h 01m 21.8s, h = 40 km), is one of the largest earthquakes recorded in recent years.
Large earthquakes in the Aleutian arc occur on the convergent boundary between the Pacific and North American crustal plates. The overriding plate along the western Aleutian subduction zone is laterally segmented into a series of rigid tectonic blocks separated by fault controlled canyons and extensional basins. [[{"type":"media","view_mode":"media_large","fid":"153","attributes":{"alt":"","class":"media-image","height":"300","style":"font-size: 13.0080003738403px; line-height: 20.0063037872314px;","typeof":"foaf:Image","width":"480"}}]]Large earthquakes in the Aleutian arc occur on the convergent boundary between the Pacific and North American crustal plates. The 1965 Rat Islands earthquake share common features with the 1963 Kuril Islands earthquakeand the 1964 Alaska earthquake. This event may have been triggerred by the large displacement near the mainshock epicenter. A separate map illustrates the recent earthquakes as circles, superimposed on stippled areas illustrating the rupture zones of major earthquakes this century. This tectonic setting controlled the rupture behavior of the M8.7 event.The 1957 Andreanof Islands Mw 8.6 earthquake ruptured an 800 km-long portion of the plate boundary (see map) to the east of the 1965 event rupture. The 1963 Kuril Islands earthquakeoccurred at 05:17 UTC, on October 13. The earthquake had a magnitude of 8.5 and was followed by a Mw=7.8 event seven days later. This event may have been triggerred by the large displacement near the mainshock epicenter. The Rat Islands event was closely followed by a large tensional outer-rise event of March 30, 1965 (Ms 7.5, smaller star), which was located oceanward of the largest moment release associated with the Rat Islands mainshock rupture. Property damage was around $125 million (1965 rate). The overriding plate along the western Aleutian subduction zone is laterally segmented into a series of rigid tectonic blocks separated by fault controlled canyons and extensional basins. The great Mw=8.7 Rat Islands underthrusting earthquake (larger star on the above map) of February 4, 1965, ruptured a 600-km segment of the western end of the Aleutian Islands (black solid line). This tectonic setting controlled the rupture behavior of the M8.7 event.The 1957 Andreanof Islands Mw 8.6 earthquake ruptured an 800 km-long portion of the plate boundary (see map) to the east of the 1965 event rupture.
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