See more » Mercalli intensity scale. spared many lives because schools were closed and few people were shopping on Good Friday. The 9.2 magnitude earthquake had a depth of 25 kilometers, lasted 4 minutes and 38 seconds and killed nearly 131 people. The 1964 earthquake in Anchorage, Alaska occurred as a result of an oceanic plate sinking under a continental or land plate. The Kids Fun Science Bookstore covers a wide range of earth science topics. Award Winning Earth Science Materials at our Bookstore. State at least two geological events that are happening at the, location (examples are formation of volcanoes and earthquakes)? Damage in downtown Anchorage, USGS Liquefaction in and around Anchorage tore the land apart. Two hundred acres of land slid into the ocean at Turnagain Heights. The Mercalli intensity scale is a seismic intensity scale used for measuring the intensity of an earthquake. Ocean wide wavesThe main tsunami that swept across the Pacific Ocean. 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). Scroll down to read Look at the arrows on the map. State which plate tectonic interaction is. The earthquake rupture started approximately 25 km beneath the surface, with its epicenter about 6 miles (10 km) east of the mouth of College Fiord, Most of the people were home and schools were closed for the day. Northern Virginia Community College • ENV 121, Environmental Geology Notes on Metamorphic Rock, deep_earth_structure_global_tectonics_d_mueller.pdf, 1. The marker represents events on a plate boundary. Alaska’s continental shelf and North American plate rose over 9 meters during the earthquake. 1964 Alaska earthquake is mega thrust earthquake that occurred in the subduction zone that Pacific plate was subducting beneath the North American plate or along the Aleutian fault with length of 3400 kilometers. 1.2 Tectonics of the great 1964 Alaska earthquake. Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths. New!! occurring at this plate boundary (slip, collision, spreading, or subduction): 3. This preview shows page 1 - 2 out of 3 pages. The main but not initial megathrust in the eastern part of the great 1964 Alaska M 9.2+ earthquake was actually the yak thrusting west-southwest onto the Pacific plate (Reeder, 2016; Stauder and Bollinger, 1966; Wyss and Brune, 1967). The Anchorage International Airport tower collapsed during the earthquake. (Image credit: USGS) The Great Alaska earthquake struck at 5:36 p.m. Alaska Standard Time on March 27, 1964. Many houses, buildings and infrastructures were damaged or destroyed. During the earthquake, an 8 0 0 k- i lo m e te r by 2 5 0 k- i lo m e te r a r e a (s e e It was the largest earthquake ever recorded in North America. State which plate tectonic interaction is occurring at this plate boundary (slip, collision, spreading, or subduction): Subductio n divergent 3. . This photo shows a landslide that was caused by the earthquake near Anchorage, Alaska. Alaskan Earthquake Video (1966) Excerpt from the TV show "The Big Picture" produced by the US Army in 1966 about the Alaska Earthquake and its tragic effects. The US state was hit by a 9.2-magnitude earthquake in March 1964, the strongest ever recorded in North America. It was the largest earthquake ever recorded in North America. Earth scientists now recognize that the 1964 Great Alaska Earthquake resulted from plate convergence: where the Pacific megathrust fault during the 1964 earthquake Plate is being overridden by the North American Plate, it descends, or subducts, into the Earth’s mantle along the Aleutian Trench. © 2011-2020 Call of Fire Science Company  All rights reserved. List the plates that make up the, 2. At magnitude 9.2, it was the second largest quake ever recorded by seismometers. Parts of Montague Island were uplifted  4-9 meters (12 to 36  feet). Alaska earthquake of 1964, earthquake that occurred in south-central Alaska on March 27, 1964, with a moment magnitude of 9.2. Turnagain Heights landslideA huge landslide in downtown anchorage caused the main business district to drop down nine feet (3 meters). It killed people in Hawaii when the waves came ashore. Off the coast of Alaska lies the Aleutian Subduction Zone –a 2,500 mile long convergent plate boundary where the Pacific Plate subducts under the North American Plate at a rate of 6–7 cm/yr. The 1964 great Alaska earthquake was the second largest earthquake recorded instrumentally, with moment magnitude, M w =9.2 (Kanamori, 1977).Surface displacements in the epicentral region suggest that beneath Prince William Sound the Pacific plate–North America interface slipped by 15–20 m or more during this event (Holdahl and Sauber, 1994, Oleskovich et al., 1999). Course Hero is not sponsored or endorsed by any college or university. 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. Two types of tsunami were produced as a result of this massive quake. This kind of subduction causes the largest and deepest earthquakes known. The boundary of aftershocks from the 1964 earthquake by Furumoto [1965] is shown by the thick line. Look at the arrows on the map. On Good Friday, March 28, 1964, south-central Alaska was struck by the second-largest earthquake ever recorded. The U.S. Geological Survey reports that: The earthquake caused rivers, lakes, and other waterways to slosh as far away as the coasts of Texas and Louisiana. At this boundary, the Pacific Plate slides beneath the North American Plate, causing the majority of Alaska’s earthquakes, including the 1964 earthquake. Subduction zone earthquakes follow the descent of the Pacific plate down to 200 km or more. The megathrust boundary between the plates results in both the 4,000-km-long Aleutian Trench and in the arc of active volcanoes that lie subparallel to the trench. The distance from the Prince William Sound to Anchorage is 101 miles. A. As … The wave in the inlet that reached a height of 200 feet (67 meters). Check out Myrna Martin's award winning textbooks, e-books, videos and rock sets. The Pacific Plate containing the Pacific Ocean is being pushed under the North American Plate. The Great Alaskan Earthquake of 1964 happened on Good Friday, March 27th, at 5:36 p.m. Atlantic Daylight Time. Location map of the Kenai Peninsula and Kodiak Island, Alaska. Crustal plate movementThe Pacific Plate moved underneath the North American Plate an average of 27 feet (9 meters) during the earthquake. Most people were home and schools were closedThe great 1964 Alaska Earthquake occurred on Good Friday, March 27, 2964 in the late afternoon. The 1964 earthquake was caused by the same processes that cause the majority of earthquakes in that area. Pacific Plate subducting beneath the North American PlateThe area where the earthquake occurred is a subduction zone where the Pacific Plate is subducting beneath the North American Plate. A crevasse ripped apart an elementary school that was closed for the day. This earthquake occured at the convergent boundary between the Pacific Plate and the North American Plate. Click here to browse.Â. the website about where these events are taking place. The Kids Fun Science Bookstore covers a wide range of earth science topics. 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. The late afternoon quake spared many lives because schools were closed and few people were shopping on Good Friday. Because of its higher relative density, as it collides into North America, the Pacific plate descends (subducts) beneath the North American plate. The M 9.2 earthquake ruptured a patch of the subduction zone that was ~500 miles long and 100–175 miles wide, producing vertical displacements over an area of about 110,039 square miles in south-central Alaska (Plafker, 1969). 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