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2001 Nisqually earthquake
The Nisqually earthquake (also commonly referred to as "The Ash Wednesday Quake") was an intraslab earthquake, occurring at 10:54 am PST (18:54 UTC) on February 28, 2001. One of the largest recorded earthquakes in Washington state history, it measured 6.8 on the moment magnitude scale and lasted approximately 45 seconds. The epicenter of the earthquake was Anderson Island, about northeast of Olympia. The focus was at a depth of . Tremors were felt as far away as Scio, Oregon, across the border in Vancouver, British Columbia, Canada, and east in Pasco, Washington. There were also reports that it was felt as far away as Spokane, Washington and Sandpoint, Idaho.
The quake caused some property damage in Seattle and surrounding areas. Although there were no reports of deaths directly from the earthquake, local news outlets reported that there was one death from a heart attack at the time of the earthquake.〔
==Geological origins==
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 at 3.5 to 4.5 cm. a year 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 change in volume as rock changed from one form to another. Similar significant earthquakes occurred in the same general region on April 29, 1965 (magnitude 6.5, depth ), and April 13, 1949 (magnitude 7.1, depth ).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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