Subduction causes deep ocean trenches to form, such as the one along the west coast of South America. What boundary was the 1964 Alaska earthquake? Compaction in the Rock Cycle: Understanding the Process Behind Sedimentary Rock Formation, Crystallization in the Water Cycle: A Fundamental Process in Water Distribution and Purification, Understanding Crystallization in the Rock Cycle: A Fundamental Process in Rock Formation, Extracting Lat/Lng from Shapefile using OGR2OGR/GDAL. There are three types of plate boundaries: spreading zones, transform faults, and subduction zones. The route is dotted by some serious volcanoes and wracked by violent earthquakes. Photo courtesy of Robert J. Lillie. It seems JavaScript is either disabled or not supported by your browser. The .gov means its official. The reason: This quake opened a new era in geology. Accessibility As bad as the tremors were, the worst was yet to come. In 1964, portions of the Pacific Plate along Alaskas long southern coastline moved north, diving beneath the North American Plate. As Europe and Africa move away from North and South America at about 1 inches (4 centimeters) per year, the Atlantic Ocean has opened to a width of 4,000 miles (6,000 kilometers) in the past 150 million years! Shallow earthquakes and little volcanism occur where one plate slides laterally past another. Alaska's continental shelf and North American plate rose over 9 meters during the earthquake. The plate boundary is a broad zone of deformation with a width of about 60 miles (100 kilometers). USC Tsunami Research Group.Seismic Seiches from the 1964 Alaska Earthquake. U.S. Geological Survey Meanwhile, land near the coast just above the fault rose when the fault slipped. commemorates the Alaska Earthquake and examines the advances in knowledge and technology that have helped improve earthquake preparation and response in Alaska and around the world. Beginning about 30 million years ago, so much of the Farallon Plate was consumed by subduction that the Pacific and North American plates were in contact, forming the San Andreas transform plate boundary in western California. The lithosphere is relatively rigid and is broken into slowly moving tectonic plates. View from the playground of the Government Hill School in Anchorage, showing damage from the 1964 earthquake. The San Andreas Transform Plate Boundary developed within the past 40 million years as a large portion of the Farallon Plate was subducted and the Pacific Plate made contact with the North American Plate in the California region. Tectonics of the March 27, 1964 Alaska Earthquake
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