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A magnitude-9.0 earthquake would result in a tsunami that would reach Puget Sound. What comes after the Big One? Even after the Big One is done, aftershocks should be expected, Bodin said.
Damaging earthquakes are well known in the Pacific Northwest, including several larger than magnitude 7, most notably the M9 1700 Cascadia earthquake and the M7.0–7.3 earthquake in about 900AD on the Seattle Fault. The M6.5 1965 Puget Sound earthquake shook the Seattle, Washington, area, causing substantial damage and seven deaths. This event ...
The "Parkfield earthquake prediction experiment" was the most heralded scientific earthquake prediction ever. [ 186 ] [ t ] It was based on an observation that the Parkfield segment of the San Andreas Fault [ u ] breaks regularly with a moderate earthquake of about M 6 every several decades: 1857, 1881, 1901, 1922, 1934, and 1966. [ 187 ]
Extrapolation from the Parkfield earthquakes of 1857, 1881, 1901, 1922, 1934, and 1966 led to a forecast of an earthquake around 1988, or before 1993 at the latest (at the 95% confidence interval), based on the characteristic earthquake model. [12] Instrumentation was put in place in hopes of detecting precursors of the anticipated earthquake.
French prognosticator Nostradamus predicted an epic earthquake would rock the earth on Thursday, but the world appears to have escaped relatively unscathed. Approximately 500 years ago ...
The chances for a 6.0 magnitude or greater earthquake to occur along the Seattle Fault within the next 30 years is 80-85%, according to one seismologist.
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]
The prospect of a major earthquake on the Doty Fault poses a serious hazard to the entire Puget Sound region as it threatens vital economic lifelines: At Chehalis there is but a single freeway (Interstate 5) and a single rail line connecting the Puget Sound region with the rest of the west coast; the only alternate routes are very lengthy. [186]