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The Puget Sound faults under the heavily populated Puget Sound region (Puget Lowland) of Washington state form a regional complex of interrelated seismogenic (earthquake-causing) geologic faults. These include (from north to south, see map) the: Devils Mountain Fault; Strawberry Point and Utsalady Point faults; Southern Whidbey Island Fault (SWIF)
The San Andreas fault system and other large faults in California - different segments of the fault display different behavior: Date: 4 December 2009, 11:11 (UTC) Source: San_Andreas_Fault_Map.gif; Author: San_Andreas_Fault_Map.gif: USGS; derivative work: Luigi Chiesa (talk)
Plaque showing location of San Andreas Fault in San Mateo County. The San Andreas Fault is a continental right-lateral strike-slip transform fault that extends roughly 1,200 kilometers (750 mi) through the U.S. state of California. [1] It forms part of the tectonic boundary between the Pacific plate and the North American plate. Traditionally ...
Simplified fault map of southern California The faults of Southern California viewed to the southeast, as modeled by the Southern California Earthquake Center. Highlighted in purple are the San Andreas Fault (left) and Santa Monica Bay complex (right). The foreground is in the Santa Barbara Channel, the east-trending zone marks the Transverse ...
Shoshone County, Idaho County, and Nez Perce County were established in Washington Territory in 1861, and Boise County in 1863, until they split off into the Idaho Territory in March 1863, leaving the current borders of Washington. [51] Ferguson County, named for Washington legislator James L. Ferguson, was established on January 23, 1863, from ...
The San Andreas Fault is an active continental transform fault, and there is evidence for recent basaltic volcanism across this region. Majority of magmatism here occurs as a result of releasing fault bends along the transform which form pull-apart extensional basin structures: Coachella Valley, Imperial Valley, Owens Valley, Panamint Valley ...
Studies of past earthquake traces on both the northern San Andreas Fault and the southern Cascadia subduction zone indicate a correlation in time which may be evidence that quakes on the Cascadia subduction zone may have triggered most of the major quakes on the northern San Andreas during at least the past 3,000 years or so. The evidence also ...
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 ...