| Nisqually Earthquake |
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The Nisqually earthquake was an intraslab earthquake, occurring on February 28 , 2001 , and was one of the largest recorded Earthquake s in Washington state history. The quake measured 6.8 on the MMS , and was centered about 17 Km (10.6 Mile s) northeast of Olympia at a depth of 52km (about 27 miles). Most of the property damage occurred very near the Epicenter or in unreinforced Concrete or Masonry Building s, such as those in the Pioneer Square and Sodo Neighborhood s of Seattle . The quake damaged the Alaskan Way Viaduct that runs along the Seattle waterfront. It also cracked the dome atop the Capitol Building in Olympia. There were no reports of Death s directly from the earthquake, but local news outlets reported that there was one death from a Stress -related Heart condition at the time of the earthquake; the quake also caused approximately 250 injuries. after the Nisqually Earthquake ]] The air traffic control tower at Sea-Tac Airport was heavily damaged during the quake. It has since been replaced with a more earthquake-resistant tower. The U.S. Military bases of Fort Lewis and McChord AFB received minimal damage in the quake. The Puget Sound area where this earthquake occurred is prone to deep earthquakes due to the Juan De Fuca Tectonic Plate 's Subduction under the North American Plate as part of the Cascadia Subduction Zone , which causes stress in the former as it sinks into the Mantle . As an intraslab earthquake it was produced by a volumetric change due to rock changing from one form to another. Similar significant earthquakes occurred in the same general region on April 29 , 1965 (magnitude 6.5, depth 63km), and April 13 , 1949 (magnitude 7.1, depth 53km). SEE ALSO EXTERNAL LINKS |
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