. In some places, such as along the South Fork of the Stillaguamish River between Arlington and Granite Falls, there are also contrasting geological contacts. It is uncertain how these faults relate to the structure, and whether they are deep-seated faults, or fractures due to bending of the shallow crust. The fault type is subducting. [140] Recent geophysical modeling suggests that the Dewatto lineament is the expression of a blind (concealed), low-angle, east-dipping thrust fault, named the Dewatto fault. In the angle between these is located the minor Lincoln Creek uplift, the Doty Hills, and, further west, an impressive chunk of Crescent basalt. [95], (Rattlesnake Mountain Fault Zone not included in QFFDB. "Most often, when we think of tsunamis, we think of our outer coast and communities along the Pacific Ocean. 206-296-3830. Scientists look for answers in methane bubbles rising from bottom of [40], The Southern Whidbey Island Fault (SWIF) is a significant terrane boundary manifested as an approximately four mile wide zone of complex transpressional faulting with at least three strands. According to the Washington state Department of Natural Resources, more than 1,000 earthquakes happen in Washington state each year! However, the SWCC is relatively shallow (no more than 15 km deep), and likely is draped over pre-Tertiary bedrock. East of Puget Sound the basement of the Cascades province is various pre-Tertiary (older than 65 Ma) metamorphic rock. This map shows the primary earthquake faults in the Puget Sound and other less prominent faults. Glacially deposited and shaped fill covers most of the lower elevations of Puget Sound. [216], An Everett Fault, running east-northeast along the bluffs between Mukilteo and Everett that is, east of the SWIF and at the southern edge of the Everett Basin has been claimed, but this does not appear to have been corroborated.[217]. North Olympic Peninsula VA Clinic at VA Puget Sound health care, 360-565-7420. [187] Such a length would be comparable to the length of the Seattle or Tacoma faults, and capable of an earthquake of M 6.7. 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. These mlanges may have been off-shore islands or seamounts that were caught between the Olympic terrane and the North American continent, and were pushed up (obducted) onto the latter. The Straight Creek Fault is a major structure in the North Cascades, but has not been active for over 30 million years. As all of these are thrust and reverse faults, they probably result from northeast directed regional compression. The length of the Doty Fault is problematical: the report in 2000 gave it as 65km (40 miles), but without comment or citation. There's a one-in-10 chance that the next . 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. Puget Sound, Washington has had: (M1.5 or greater) 0 earthquakes in the past 24 hours. This map of Puget Sound shows the location of the methane plumes (yellow and white circles) detected along the ship's path (purple). The QFFDB, citing lack of consensus, ignores the eastern part. and Fault Location. These features suggest that the southern Puget Lowland is influenced by the deep crust and even the subducting Juan de Fuca plate, but the details and implications are not yet known. Simply put, the basement rock on the west side of Puget Sound does not match the basement rock on the east side. Newport Inglewood Rose Canyon Fault Zone. [68] Both of these faults (and some others) appear to terminate against the left-lateral Sultan River Fault at the western margin of the NNE-striking Cherry Creek Fault Zone (CCFZ; see next section). Puget Sound Tsunami Simulation - National Oceanic and Atmospheric [49] Yet it is also notable that "most seismicity in the northern Puget Sound occurs along and southwest of the southern Whidbey Island fault at typical depths of 1527 km within the lower part of the Crescent Formation. TTY Relay 711. There is a general pattern where most of these faults partition a series of basins and uplifts, each about 20km wide. This map shows areas of seismic risk from high (red) to low (grayish-green). It's due for another one,. [47], To the southeast the SWIF passes through Admiralty Inlet (past Port Townsend) and across the southern part of Whidbey Island, crossing to the mainland between Mukilteo and Edmonds. This map of Puget Sound shows the location of the methane plumes (yellow and white circles) detected along the ship's path (purple). Those Hollywood depictions of a. [112] But if the Seattle Fault should break in conjunction with other faults (discussed above), considerably more energy would be released, on the order of ~M 8. Active faults and earthquakes in Washington state Seismic Scenario Catalog NEHRP site class and liquefaction susceptibility Seismic design categories Hazardous Minerals Lahar Hazards Landslides and landforms Inactive and abandoned mines Contact Us Susan Schnur Editor-in-Chief 360-701-6122 DNR is led by Commissioner of Public Lands Hilary Franz [57] Mapping of areas further east that might clarify the pattern is not currently planned. Seattle Fault Bigger Quake Threat Than Thought | Live Science It is of interest here because the various strands of the Seattle Fault change orientation where they appear to cross the OWL,[20] and various other features, such as the Rosedale monocline and Olympia structure, and a great many local topographical features, have parallel alignments. Energize Eastside project is building a new substation and upgrading approximately 16 miles of existing transmission lines from Redmond to Renton. I've been in the business for 20 years and the way skilled labor has been treated up until very recently drove a ton of people away from the industry. Although the southwest striking Canyon River Fault is not seen to directly connect with the Saddle Mountain faults, they are in general alignment, and both occur in a similar context of Miocene faulting (where Crescent Formation strata has been uplifted by the Olympics) and a linear aeromagnetic anomaly. Marine seismic reflection surveys on either side of Whidbey Island extend the known length of these faults to at least 26 and 28km (about 15 miles). 6 earthquakes in the past 7 days. [71], These faults cut through the Western Mlange Belt (WMB; blue area in map), exposed from North Bend (on Interstate 90) to Mount Vernon. Puget Sound and San Juan islands. - Read More Expert Puts Turkey, Syria Quake into Perspective | FOX 13 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. A UW researcher says the fault line that caused earthquake that shook southern Turkey near the Turkish-Syrian border this week and killed more than 7,000 people is similar to the faults under Puget Sound. Cluster of earthquakes in Puget Sound considered 'normal', earthquake researchers say. [89] The northern end of the mountain falls off where it crosses the eastern end of the Seattle Fault, which in turn terminates at the RMFZ; Rattlesnake Mountain forms the eastern edge of the Seattle Uplift. New tsunami maps show how water could reach Seattle, Everett, Tacoma Not until 2001 was it identified as a fault zone,[12] and only in 2004 did trenching reveal Holocene activity. Do you live in a natural-disaster danger zone? Check this Seattle map Yet the former is only the first of at least six more parallel southeast striking faults, which do cross the Salzer Creek Fault. Black lines show the South Whidbey Island Fault Zone, the Seattle Fault Zone and the Tacoma Fault Zone. 0 magnitude subduction earthquake off the Washington coast would generate a tsunami capable of submerging not only coastal areas but also most of the Puget Sound shoreline . [104] Although there is no direct evidence for any major north-striking faults under Seattle, this prospect appears to be endorsed by the geological community.[105]. While these models vary in some details, both indicate that the Seattle Fault itself is capable of a magnitude 7.5 earthquake. [82] The mapped surface traces are only 5km long, but LIDAR-derived imagery shows longer lineaments, with the traces cutting Holocene alluvial traces. 09 Feb 2023 03:01:00 West of Puget Sound the tectonic basement of the Coast Range geologic province is the approximately 50 million year (Ma) old marine basalts of the Crescent Formation, part of the Siletzia terrane that underlies western Washington and Oregon. [16] For the past 50 million years or so (since the early Eocene epoch) these have been thrust by subduction up against the North Cascades ("fixed block" in the diagram), which sit on the North American Plate. South of the OWL a definite eastern boundary has not been found, with some indications it is indefinite. 112 earthquakes in the past 365 days. On this Wikipedia the language links are at the top of the page across from the article title. The DotySalzer Creek Fault does not fully fit the regional pattern of basins and uplifts bounded by faults described above. ISNS Ch 5 Flashcards | Quizlet [188] In the acute angle between these is located the minor Lincoln Creek uplift, the Doty Hills, and an impressive chunk of uplifted Crescent basalt (reddish area at west edge of the map). The geology also suggests that the DMF is moving obliquely up a ramp that rises to the east,[35] possibly an ancient coastal shore. Turkey's fault line is similar to faults under Puget Sound More than a millennium ago, a quake estimated at a magnitude 7 on the Seattle Fault thrust land upward as much as 23 feet and submerged 200-acre chunks of forest in central Puget Sound and Lake . [190] These faults also cross the Saint Helens Zone (SHZ), a deep, north-northwest trending zone of seismicity that appears to be the contact between different crustal blocks. In the previous study seismicity, surface geology, and geophysical data were modeled in order to examine the fault structuring of the upper crust. Page 2 of 4 / 2012-2013 Type of Earthquake Most earthquake hazards result from ground shaking caused by seismic waves that radiate out from a fault when it ruptures. Subsidence dated to between AD 1445 and 1655 has been reported in Mud Bay (just west of Olympia). "We. [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.
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