That’s where one tectonic plate sinks beneath another. Many houses, buildings and infrastructures were damaged or destroyed. Turnagain Heights landslideA huge landslide in downtown anchorage caused the main business district to drop down nine feet (3 meters). Alaska earthquake of 1964, earthquake that occurred in south-central Alaska on March 27, 1964, with a moment magnitude of 9.2. This earthquake occurred after the world’s largest earthquake occurred in Chile within 1960. Look at the arrows on the map. Figure 1. The Alaska- Aleutian subduction zone, at the plate boundary, is responsible for most of the earthquake activity in south-central Alaska—including the 1964 Earthquake. 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 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 … In comparing these two events we can get an overview of what happened and better prepare ourselves for something like that in the future. The land around the town of Portage subsided approximately 3 meters (9 feet). The wave in the inlet that reached a height of 200 feet (67 meters). It was the largest earthquake ever recorded in North America. A crevasse ripped apart an elementary school that was closed for the day. At magnitude 9.2, it was the second largest quake ever recorded by seismometers. The area is now Earthquake Park. The Earthquake and Its Effects The 1964 Alaska earthquake resulted from rupture along the thrust fault boundary bet-ween the downgoing Pacifi c Plate and the overriding North American Plate, causing widespread shaking and tectonic defor-mation. 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, the website about where these events are taking place. The epicenter of the earthquake was 6 miles east of the mouth of College Fiord, approximately 55 miles west of Valdez and 74 miles east of Anchorage. Subduction zone earthquakes follow the descent of the Pacific plate down to 200 km or more. It was generated by movement on the ocean floor. New!! It killed people in Hawaii when the waves came ashore. The epicenter was six miles (10 kilometers) east of College Fiord in the Prince William Sound. Strong, destructive earthquakes can accompany a rapid, several-meter uplift of bedrock along subduction zones. The 1964 earthquake in Anchorage, Alaska occurred as a result of an oceanic plate sinking under a continental or land plate. 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). The event had a rupture length of roughly 700 km extending from Prince William Sound in the northeast to the … The late afternoon quake spared many lives because schools were closed and few people were shopping on Good Friday. 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). The land around the town of Portage subsided approximately 3 meters (9 feet). Most people were home and schools were closedThe great 1964 Alaska Earthquake occurred on Good Friday, March 27, 2964 in the late afternoon. Because of its higher relative density, as it collides into North America, the Pacific plate descends (subducts) beneath the North American plate. strongest earthquakes in Southern Alaska are generated by the megathrust fault that marks the contact zone between the subducting Pacific and overriding North American plates. The 1964 Great Alaska Earthquake occurred on Good Friday, March 27th. Crustal plate movementThe Pacific Plate moved underneath the North American Plate an average of 27 feet (9 meters) during the earthquake. Check out Myrna Martin's award winning textbooks, e-books, videos and rock sets. Award Winning Earth Science Materials at our Bookstore. Northern Virginia Community College • ENV 121, Environmental Geology Notes on Metamorphic Rock, deep_earth_structure_global_tectonics_d_mueller.pdf, 1. The Alaskan Earthquake 1964 An examination of the 1964 Alaska Good Friday Earthquake from a (pre- plate tectonics theory) geological point of view. 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. Two types of wavesNinety percent of the people that died in the 1964 Alaska earthquake were killed by tsunamis. This photo shows a landslide that was caused by the earthquake near Anchorage, Alaska. Alaska is part of the seismically active Pacific Ring of Fire. A large landslide triggered a tsunami in Shoup Bay near Valdez. The Anchorage International Airport tower collapsed during the earthquake. 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. Schools and residential damageThe residential area of Anchorage suffered total destruction when the bluffs collapsed. The US state was hit by a 9.2-magnitude earthquake in March 1964, the strongest ever recorded in North America. Parts of Montague Island were uplifted  4-9 meters (12 to 36  feet). 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. This animation discusses the range of tectonic activity from megathrust earthquakes to accretion of geologic terranes. Alaska’s largest earthquakes, exceeding magnitude 8 and even 9, occur primarily in the shallow part of the subduction zone, where the crust of the Pacific Plate sticks and slips past the overlying crust. List the plates that make up the boundary: pacific plate and oceanic plate 2. Alaska’s continental shelf and North American plate rose over 9 meters during the earthquake. The 1964 M9.2 Great Alaska Earthquake, which is still the second largest earthquake ever recorded worldwide, began under Prince State at least two geological events that are happening at the, location (examples are formation of volcanoes and earthquakes)? Look at the arrows on the map. The US state was hit by a 9.2-magnitude earthquake in March 1964, the strongest ever recorded in North America. All the casualties in Seward were caused by tsunami. A. Scroll down to read The Kids Fun Science Bookstore covers a wide range of earth science topics. The 1964 Good Friday Earthquake and Tsunami, 1912 eruption of Novarupta in Katmai National Park, EcG9zAzQEdnRpZANDMDE2MF8xBHNlYwNzcg--/RV=2/RE=1606789255/RO=10/RU=, https%3a%2f%2fwww.onlyinyourstate.com%2falaska%2fmost-horrifying-natural-, disasters-ak%2f/RK=2/RS=bPQd9tJPtgcEozL6J6OvTKQJzAI-. Local tsunamisLocal tsunamis were generated by landslides crashing into bays and fjords. Damage in downtown Anchorage, USGS Liquefaction in and around Anchorage tore the land apart. Click here to browse.Â. As … On Good Friday, March 28, 1964, south-central Alaska was struck by the second-largest earthquake ever recorded. The Pacific Plate containing the Pacific Ocean is being pushed under the North American Plate. Most of the people were home and schools were closed for the day. On March 27th, 1964 the afternoon of Good Friday, the strongest earthquake recorded in North America hit Anchorage, Alaska and became known as the great Alaskan earthquake/the Good Friday earthquake. This preview shows page 1 - 2 out of 3 pages. plates 1.docx - A Name of the orange marker 1964 Alaska Earthquake 1 The marker represents events on a plate boundary List the plates that make up the, 1. 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). Two types of tsunami were produced as a result of this massive quake. It rocked the state with strong ground shaking for 4.5 minutes. The easternmost megathrust earthquake was the March 28, 1964 M9.2 Prince William Sound earthquake, currently the second largest recorded earthquake in the world. (Image credit: USGS) The Great Alaska earthquake struck at 5:36 p.m. Alaska Standard Time on March 27, 1964. Location map of the Kenai Peninsula and Kodiak Island, Alaska. At this boundary, the Pacific Plate slides beneath the North American Plate, causing the majority of Alaska’s earthquakes, including the 1964 earthquake. Include information from. 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. This kind of subduction causes the largest and deepest earthquakes known. Only 9 people died from the earthquake, but 130 died from the subsequent tsunami; 10 as far away as Crescent City, CA. Most of the people were home and schools were closed for the day. Thanks to the technology and inquiring minds we are able to study past events like the 1906 San Francisco earthquake and the 1964 Alaska earthquake. The 1964 earthquake in Anchorage, Alaska occurred as a result of an oceanic plate sinking under a continental or land plate. The 9.2 magnitude earthquake had a depth of 25 kilometers, lasted 4 minutes and 38 seconds and killed nearly 131 people. In 1964, portions of the Pacific Plate along Alaska’s long southern coastline moved north, diving beneath the North American Plate. Alaska is part of the seismically active 'Pacific Ring of Fire'. The boundary of aftershocks from the 1964 earthquake by Furumoto [1965] is shown by the thick line. Geology and the Environment (1)-merged.pdf, Coastline Community College • GEOLOGY 105. Tsunami damage in SewardIn Seward, a section of the waterfront slid into Resurrection Bay causing an oil fire as it was floating offshore. The marker represents events on a plate boundary. The Great Alaskan Earthquake of 1964 happened on Good Friday, March 27th, at 5:36 p.m. Atlantic Daylight Time. The Kids Fun Science Bookstore covers a wide range of earth science topics. Epicenter, Focus, and Magnitude. spared many lives because schools were closed and few people were shopping on Good Friday. 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. 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). Course Hero is not sponsored or endorsed by any college or university. 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. Produced by Creative Arts Studio in 1964 for the USGS. List the plates that make up the, 2. State which plate tectonic interaction is. 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. 1.2 Tectonics of the great 1964 Alaska earthquake. The distance from the Prince William Sound to Anchorage is 101 miles. Two types of tsunami were produced as a result of this massive quake. It was the largest earthquake ever recorded in North America. Scroll down to read more. Two hundred acres of land slid into the ocean at Turnagain Heights. See more » Mercalli intensity scale. The Mercalli intensity scale is a seismic intensity scale used for measuring the intensity of an earthquake. There were two types of waves generated during the earthquake. © 2011-2020 Call of Fire Science Company  All rights reserved. The great 1964 Alaska Earthquake occurred on Good Friday, March 27, 2964 in the late afternoon. Check out Myrna Martin's award winning textbooks, e-books, videos and rock sets. Ocean wide wavesThe main tsunami that swept across the Pacific Ocean. The 1964 earthquake was caused by the same processes that cause the majority of earthquakes in that area. The crust of southern Alaska was compressed and warped due to plate movement prior to the great earthquake after the plates locked together. State which plate tectonic interaction is occurring at this plate boundary (slip, collision, spreading, or subduction): Subductio n divergent 3. . 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 occurring at this plate boundary (slip, collision, spreading, or subduction): 3. Name of the orange marker: 1964 Alaska Earthquake 1. This earthquake occured at the convergent boundary between the Pacific Plate and the North American Plate. 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. The marker represents events on a plate boundary. D) plate boundaries move at regular rates so the interactions across plate boundaries are predictable and regular B) stress continues to build up all the time and when it is great enough to overcome friction there will be an earthquake and then the process will start over again Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths. 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. 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