Seattle isn't the only place that faces that threat. This interpretation suggests that the Seattle Uplift acts as a rigid block, and possibly explains the kinematic linkage by which large earthquakes may involve ruptures on multiple faults: the Seattle, Dewatto, and Tacoma faults represent the northern, western, and southern faces of a single block. Somewhere between Puget Sound and Cascades foothills these two geological provinces come into contact. On the east, the Devils Mountain Fault connects with the south striking Darrington Fault (not shown) which runs to the OWL, and the Southern Whidbey Island Fault extends via the Rattlesnake Mountain Fault Zone (dashed line) to the OWL.

[187], That Olympia and the south Sound are at risk of major earthquakes is shown by evidence of subsidence at several locations in southern Puget Sound some 1100 years ago. [126] This trend extends further north where the Pleasant Harbor lineament appears to terminate other westward extensions of the SFZ. Several possible explanations of the enhanced conductivity have been considered; Eocene marine sediments containing brine are most likely (. The Olympia structure – also known as the Legislature fault[175] – is an 80 km long gravitational and aeromagnetic anomaly that separates the sedimentary deposits of the Tacoma Basin from the basalt of the Black Hills Uplift (between lines A and B on the map). It has been suggested that a corresponding change in the character of the SWIF may reflect a change in the direction of regional crustal strain. The evidence led researchers to the conclusion that about 1,100 years before, land south of the Seattle Fault shot up 20 feet in a day. Not until 2001 was it identified as a fault zone,[136] and only in 2004 did trenching reveal Holocene activity. Other faults to the south and southeast – the Frigid Creek Fault and (to the west) Canyon River Fault – suggest an extended zone of faulting at least 45 km long. “Our goal is to get people thinking about these things.”. Though the Olympia Structure (a suspected fault) runs towards the SHZ, and delineates the northern edge of an exposed section of the Crescent Formation, it appears to be an upper crustal fold, part of a pattern of folding that extends southeast to cross the Columbia River near The Dalles, and unrelated to the mid and lower crustal SHZ. According to the preeminent model, the "Puget Lowland thrust sheet hypothesis",[26] these faults, etc., occur within a sheet of crust about 14 to 20 km deep that has separated from and is being thrust over deeper crustal blocks. [29] This prospect is especially intriguing as a possible explanation of a cluster of seismic events around 1100 years ago.[30]. The Washington Geological Survey develops, produces, and publishes a large variety of maps and reports on the hazards faced by our state. The implications of this are not only "the possibility of a moderate to large crustal earthquake along the SHZ", but that the tectonics under Puget Sound are more complicated than yet understood, and may involve differences in the regional stress patterns not reflected in current earthquake hazard assessments.
[79], The Cherry Creek fault zone (CCFZ) was discovered in 2010 while mapping the area at the north end of the Rattlesnake Mountain fault zone (RMFZ). The Seattle fault bisects the city west to east, from Alki Point in West Seattle, through downtown, along the I–90 corridor and all the way towards Issaquah. [72], These faults cut through the Western Mélange Belt (WMB; blue area in map)), exposed from North Bend (on Interstate 90) to Mount Vernon .


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