Scientists believe the cause of that big earthquake was a fault that lies right beneath our feet. Aeromagnetic surveys,[13] seismic tomography,[14] and other studies have also contributed to locating and understanding these faults. All this is explained by right-lateral strike-slip motion on the Straight Creek Fault, which initiated about 50 to 48 Ma (millions of years ago). South of the OWL a definite eastern boundary has not been found, with some indications it is indefinite. [101] This turns and runs just south of Victoria, nearly in-line with the SWIF. The SWCC appears to be Tertiary marine sediments, not the pre-Tertiary metamorphic rock of the Cascades province; this would seem to make it part of the Coast Range province, with the Coast Range—Cascade contact further east. Year Published: 2000 Data for Quaternary faults, liquefaction features, and possible tectonic features in the Central and Eastern United States, east of the [222] Seismicity sometimes occurs in zones, such as has been observed under Mercer Island, or from downtown Seattle towards Kirkland[223] but whether particular zones reflect undiscovered faults, or might be the source of damaging earthquakes, is generally unknown. The Geologic Information Portal has a Tsunami Evacuation single-topic map that allows you to search for addresses and locations of interest. This map shows all completed tsunami inundation maps for Washington. [103] This last problem is partly solved because there is a locus of seismicity, and presumably faulting, extending from the northern end of the SHZ to the northern end of the Western Rainier Zone (see Fig. From the north these are (see the map at right): The Hood Canal Fault (and its possible extensions) and Saddle Mountain faults to the west are believed to form the western boundary to all this. The USGS has produced a new series of earthquake hazard maps for the City of Seattle. The Geologic Information Portal has a Natural Hazards single-topic map that contains the site class, liquefaction, and seismic design categories data. [146] The Dewatto linement extends from the western end of the Tacoma fault (see map immediately above) northward towards Green Mountain at the western end of the Seattle fault. [21] The OWL appears to be a deep-seated structure over which the shallower crust of the Puget Lowland is being pushed, but this remains speculative. However, the SWCC is relatively shallow (no more than 15 km deep), and likely is draped over pre-Tertiary bedrock. In the early 1990s, scientists began examining rocks along the shoreline near Alki Point in West Seattle. [231] Where it might run south of Seattle is not known; an argument has been made that it runs beneath Seattle[232] but this is still conjectural. [123] Several studies show that the southernmost strand of the SF, once past Green Mountain, turns southwest, towards the Saddle Mountain and Frigid Creek faults.
[107] Other seismic tomography has tantalizingly suggested three north-striking strands under Seattle, and a fourth just east of Lake Washington. This may explain why the Seattle and Tacoma faults seem to have ruptured at nearly the same time.[140]. A different mountain and fault zone of the same name are located near Pasco; see QFFDB Fault #565), The southern end of Rattlesnake Mountain is truncated at the Olympic-Wallowa Lineament (OWL), and the faults turn easterly to merge with the OWL. While the great subduction events release much energy (around magnitude 9), that energy is spread over a large area, and largely centered near the coast. Of great interest here is that both the northern lobe of the SWCC and the Carbon River anticline are aligned towards Tiger Mountain (an uplifted block of the Puget Group of sedimentary and volcanic deposits typical of the Puget Lowland) and the adjacent Raging River anticline (see map). But he agreed that it could help if you’re trying to decide where to buy a home. These landslides are compiled from existing geologic maps. [94] The relationship between these two fault zones is not entirely clear. Strands of the east-striking Devils Mountain Fault cross the northern tip of Whidbey Island at Dugualla Bay and north side of Ault Field (Whidbey Island Naval Air Station). Other similar rock has been found at the Rimrock Lake Inlier (bottom of diagram), in the San Juan Islands, and in the Pacific Coast Complex along the West Coast Fault on the west side of Vancouver Island. The passive roof duplex model of Brocher et al. These maps are based on model results from hypothetical earthquake scenarios on the Cascadia subduction zone, Seattle fault, or Tacoma fault. In the next section we will provide the impact studies conducted on each of the faults in Washington State. Sometimes it is difficult to assess whether or not earthquake insurance is worth the price. While these models vary in some details, both indicate that the Seattle Fault itself is capable of a magnitude 7.5 earthquake. [37] Trenching on the UPF (at a scarp identified by LIDAR) shows at least one and probably two Holocene earthquakes of magnitude 6.7 or more, the most recent one between AD 1550 to 1850, and possibly triggered by the 1700 Cascadia earthquake. Thick glacial and other deposits, heavy vegetation, urban development, and a topography of sharp relief and rapid erosion obscures the surface expression of faults in this region, and has hindered their discovery. [61] Such seismic hazards were a major issue in the siting of the plant, as it is tucked between two active strands, and the influent and effluent pipelines cross multiple zones of disturbed ground. On the eastern side, where the SWCC is believed to be in contact with pre-Tertiary terranes accreted to the North American craton, matters are different. We don't know.". The apparent gap north of Riffe Lake is possibly due to obscuration by volcanic deposits of the Northcraft Formation. The Tacoma Fault (at right, and also between lines C and D on the Uplift and basin map, above) just north of the city of Tacoma, Washington has been described as "one of the most striking geophysical anomalies in the Puget Lowland". Are climatologists studying the pandemic’s effect on Puget Sound? It is believed capable of generating earthquakes of at least magnitude 7, and there is ev…
[192] 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.[193]. Seattle Seahawks Seattle Seahawks Overview QuickShake Hawk-o-Grams RSAM Plots Sensor Map Interpret Displays Seahawks FAQ Archive Seismograms 2015 Green Bay at Seattle 2015 Carolina at Seattle … Several possible explanations of the enhanced conductivity have been considered; Eocene marine sediments containing brine are most likely (. This formation, up to 15 km thick, is largely buried (from one to ten kilometers deep), and known mainly by magnetotellurics and other geophysical methods. Hood Canal marks an abrupt change of physiography between the Puget Lowland and the Olympic Mountains to the west. [27] This "basement" rock is covered with sedimentary deposits similar to the Chuckanut Formation, and more recent (typically Miocene) volcanic deposits. Inundation maps show areas at risk of inundation by tsunamis that are generated from large earthquakes. [73] The WMB is an assemblage of Late Jurassic and Cretaceous rock (some of it as much as 166 million years old) collected in the accretionary wedge (or prism) of a subduction zone. The length of the Doty Fault is problematical: the report in 2000 gave it as 65 km (40 miles), but without comment or citation. [29] This prospect is especially intriguing as a possible explanation of a cluster of seismic events around 1100 years ago.[30]. Accommodation of strain (displacement) between the Seattle Fault and the Saddle Mountain deformation zone is likely distributed across the more pliable sediments of the Dewatto Basin; this, and the greater depth to the Crescent Formation, may account for the subdued expression of the Seattle Fault west of Green Mountain. “Some areas of the city will shake more than others,” Auflick said. [110] There is an intriguing view from Stanley, Villaseñor & Benz (1999) (see Fig. They originate miles underground, so their energy is dispersed by the time they reach us. Somewhere between Puget Sound and Cascades foothills these two geological provinces come into contact. 64, on-line) that the edge of the Crescent Formation offsets west along the Seattle Fault, with the Seattle Basin resulting from a gap between the main part of Siletiza and a northern block that has broken away.
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