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