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1965 alaska quake10/10/2023 ![]() ![]() Recorded wave heights were under a foot, however, and the warning was downgraded a couple hours after the event. The largest aftershock at the time of this article was a M6.1 about four minutes after the mainshock.īecause of the offshore location, the National Tsunami Warning Center issued a tsunami warning for much of coastal Alaska. ![]() So far, the aftershock rate has been active, so residents of the region may continue to feel shaking. There were also multiple felt reports from Alaska communities as far away as the Mat-Su Valley in Southcentral Alaska. Since the quake struck on March 27, 1964, there has. Perryville and Chignik are the nearest communities to the epicenter of the Chignik Earthquake, and felt the highest intensity shaking. (Image credit: USGS) The massive magnitude-9.2 Alaska earthquake changed the world by proving plate tectonics works. Previously, the 1938 M8.3 earthquake ruptured this section of the interface. Most of the population of Alaska and its major transportation routes, ports, and infrastructure lie near the eastern segment of the Aleutian Trench that ruptured in the 1964 earthquake. Geological Survey report by Roger Waller, Effects of the Earthquake of March 27, 1964, in the Homer Area, Alaska, quake-generated waves hit Kachemak Bay, but spared the Homer Spit and other areas because of the low tide. The M8.2 event ruptured this interface in the region between the Shumagin Islands to the southwest and Kodiak Island to the northeast. High tide had been 19.4 feet, and the low tide was at 7:30 p.m. The largest earthquakes are located along the interface, which is called the Aleutian megathrust. The Alaska Peninsula is a seismically active region where thousands of earthquakes occur each year. The Chignik Earthquake seems to be related to the earlier earthquake both occurred along the interface between the subducting Pacific and overriding North America plates, although the Chignik Earthquake was the deeper of the two. The Chignik Earthquake occurred relatively close (about 45 miles) to the location of the M7.8 Simeonof Island Earthquake that ruptured July 21, 2020. The 1964 Good Friday earthquake, which caused massive damage and loss of life across Southcentral. The Chignik Earthquake depth was approximately 28.5 miles, an intermediate-depth earthquake. Wednesday’s earthquake was Alaska’s largest since an 8.7 quake hit off the Aleutians in 1965. It lasted approximately four minutes and affected an approximately 100,000 square-mile area of South Central Alaska with the epicenter over six miles inland from College Fiord. At 10:15pm Alaska time on July 28, a magnitude 8.2 earthquake struck offshore of the Alaska Peninsula, the largest U.S. The Alaska Good Friday Earthquake began at 5:36 p.m., March 27, 1964, with a force that measured at the time of 8.3 to 8.6 on the Richter Scale, later upgraded to 9.2.
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