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The 1949 Olympia earthquake was a damaging magnitude 6.7 intraslab earthquake that occurred at 52 km depth and caused eight deaths. Another notable intraslab earthquake in the Puget Sound region was the magnitude 6.8 2001 Nisqually earthquake. Intraslab earthquakes in Cascadia occur in areas where the subducting plate has high curvature. [13]
This is a list of earthquakes in Washington, a U.S. state. Date Location MMI Mag. Deaths Injuries Total damage / notes; 2001-02-28: Puget Sound: VIII: 6.8 M w ...
A 2002 study of bridge vulnerability estimated that a magnitude 7 earthquake on the Seattle Fault would damage approximately 80 bridges in the Seattle–Tacoma area, [30] whereas a magnitude 9 subduction event would damage only around 87 bridges in all of Western Washington. [31]
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
The Tacoma Fault Zone marks the south end of the Seattle Uplift, of which the similar and related Seattle Fault Zone marks the north end. This uplift is believed to be either a slab of rock about 15 km thick being pushed up a ramp, or a wedge being popped up between these two faults, by tectonic forces from the south or south-west as tectonic plates riding on top of the Juan de Fuca plate are ...
The third type of earthquake is the one that has led to the greatest amount of damage. Significant intraslab earthquakes occurred in the same general region on April 29, 1965 (magnitude 6.7, depth 59 km (37 mi)), and April 13, 1949 (magnitude 6.7, depth 50 km (31 mi)). [7]
In Japan this kind of information is used when an earthquake occurs to anticipate the severity of damage to be expected in different areas. [2] The intensity of local ground-shaking depends on several factors besides the magnitude of the earthquake, [3] one of the most important being soil conditions. For instance, thick layers of soft soil ...
The Spencer Canyon fault is an active seismic fault located in central Washington state. It was discovered in 2014 following a years-long search for the source of the 1872 North Cascades earthquake that was felt over a wide area of the Pacific Northwest. [1]