The 2001 Nisqually earthquake occurred at 10:54:32 local time on February 28, 2001. The intraslab earthquake had a moment magnitude of 6.8 MW and a maximum Mercalli intensity of VIII . The epicenter was in the southern Puget Sound, northeast of Olympia, but the shock was felt in Oregon, Canada, eastern Washington, and Idaho. This was one of several large earthquakes that occurred in the Puget Sound region in the prior 52 years and caused property damage valued at $1–4 billion. One person died of a heart attack and several hundred were injured.
The Puget Sound area 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 North American Plate as the Juan de Fuca Plate sinks into the mantle. Similar significant earthquakes occurred in the same general region on April 29, 1965 ), and April 13, 1949 ).
Source: Wikipedia.org
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