southern whidbey island fault map

Map of Puget Sound and Hood Canal in north-central - ResearchGate It might as well have been sitting in a drawer, Johnson said. It will happen; we dont know when.. An increase of 2 means that ~1,000 times more energy is released. If they know theres data available that could help them in any way, they want to get it. Liquefaction can be a big problem. It usually also means that there are earthquakes (even small ones) on the fault. But the Cascadia Subduction Zone isnt just a fault; its an overlapping joint between tectonic plates, parts of the Earths crust that float on layers of molten rock. Finding and mapping these faults is an important mission of the Washington Geological Survey. The map is from a 2007 report (click here to download) on seismic design categories in Washington. His team wanted to find the rate of sea level rise along the shore. This is similar to how sound is quieter when you move away from a speaker. For example, the Cascadia subduction zone has had between 15 to 19 earthquakes over the past 10,000 years. What are the most dangerous fault lines for Seattle? A half dozen people reaching for the last can of soup, someone could lose their life over that. Secure .gov websites use HTTPS And while scientists keep digging for more information and more situational awareness of what we face, the other problem is human. Geologists are constantly trying to better understand the faults in our state. Armentrout, J. J. Miller, C. Finn, C. S. Weaver. The southern Whidbey Island fault should be considered capable of generating large earthquakes (Ms ?? Electricity, water, natural gas, and phones may not work. Tsunamis triggered by earthquakes usually require at least a M7 event. Gower (1980 #6229) showed and named the "southern Whidbey Island fault," and Gower and others (1985 #4725) showed this fault on their seismotectonic map of the Puget Sound region and briefly outlined its geologic relationships. California Geological Survey. These include (from north to south, see map) the: Devils Mountain Fault Strawberry Point and Utsalady Point faults Southern Whidbey Island Fault (SWIF) Rogers Belt (Mount Vernon Fault/Granite Falls Fault Zone) Cherry Creek Fault Zone Rattlesnake Mountain Fault Zone Seattle Fault Tacoma Fault Saddle Mountain Faults A damaging earthquake is inevitable on this fault, but we do not know exactly when it will happen. Click the "Seismogenic Features" button in the Map Contents window to display faults and earthquakes. They havent dug up enough history to estimate. As an example, parts of Seattle and certain areas of downtown Olympia are built on softer ground that will amplify ground shaking during an earthquake. By clicking Accept, you consent to the use of ALL the cookies. A drill rig left of the blockade is collecting data about the failure. The buildings in this photo were built on soft materials that liquefied during the 1964 Niigata earthquake in Japan. In the Puget Sound region, it takes a trained eye to recognize rocky outcrops and subtly raised ground as evidence of a fault. The Cascadia Subduction Zone (also known as the CSZ) is a 700-mile long fault zone located off the western coastline of British Columbia, Washington, Oregon and northern California. The best thing you can do is to become prepared. Maps. This fault will have an earthquake in the future, but we cannot predict exactly when. Another big one is expected, and it could be devastating. An official website of the United States government. Sherrod remembers his son, age 5 at the time, playing with toy trucks on the mossy banks of the marsh while the scientists worked. Do you live or work near an area that could have liquefaction? Seattle's Faults: Maps That Highlight Our Shaky Ground southern Whidbey Island fault zone (Class A) No. During the shaking liquefaction occurred, the sand lost its strength, and the car sunk. Johnson and others (1996 #4751) described multiple sub-parallel strands and referred to the overall structure as the "southern Whidbey Island fault zone," and this name is also used herein for this zone of faults that crosses the southern part of Whidbey Island. These maps are created by small planes that use a specific type of laser to measure the elevation of the ground. This is a hypothetical scenario created by Mark Murphy of the Snohomish County Department of Emergency Management. The South Whidbey Island Fault and Darrington Devil's Mountain Fault bound the Everett Basin. Evidence for Quaternary movement on the southern Whidbey Island fault includes (1) offset and disrupted upper Quaternary strata imaged on seismic-reflection profiles; (2) borehole data that suggests as much as 420 m of structural relief on the Tertiary-Quaternary boundary in the fault zone; (3) several meters of displacement along exposed faults in upper Quaternary sediments; (4) late Quaternary folds with limb dips of as much as ???9?? We just dont know when.. This northwest-trending fault zone extends more than 65 km across Possession Sound, southern Whidbey Island, Admiralty Inlet into the eastern Strait of Juan de Fuca. % A low-angle fault, which is not conclusively earthquake related, separates a diamicton from the overlying recessional outwash deposit. Know what to expect. Finding nothing of serious monetary value, the companies abandoned reams of information they had gathered through seismic surveys. Snohomish, King and Island counties would be expected to see the. The South Whidbey Island Fault is also dangerous. Photo from Pacific Northwest Seismic Network Seismo Blog. But opting out of some of these cookies may affect your browsing experience. stream Kristin D. Morell 1 *, Christine Regalla 2, Lucinda J. Leonard 3, Colin Amos 4, Vic Levson 5. Seattle Fault Lines. Geologic maps of 7.5-minute topographic quadrangles covering parts of the Seattle fault and southern Whidbey Island fault zone are available on the DNR website as: Sign-up for DNR enewsletters. Throughout the world shallow earthquakes generally refer to earthquakes that are less than ~45 miles deep. Earthquakes occur nearly every day in Washington. If folding on the Little Bear Creek lineament resulted in one or two of unconformities, the poorly constrained timing of the earthquakes is younger than 12,000 yr BP and older than about 2,850 cal yr BP. Seismologists estimate that such quakes and tsunami waves occur roughly every 500 years on average on the Cascadia Subduction Zone. In effect, the wave energy is trapped by the edges of the body of water. If a large earthquake happens, be prepared for many more earthquakes. This fundamental tool for earth scientists, maps show map units, faults and folds, cross sections, and other regional or local features, depending on map scale. So the fault remained mostly a mystery until the 1990s. The Port of Coupeville will apply for a grant to fund two electric vehicle charging stations. Someone screams. In much of Washington, dense vegetation covers the land and makes finding faults very difficult. A baristas hand hovers over the bean grinder. Experts believe a magnitude 9.0 could happen there anytime in the next 200 years or so. On Dec. 15th, a small swarm even hit near Bremerton, a few miles away from downtown. Consider whether earthquake insurance is right for you. The tsunamis can travel far inland and deposit layers of sand and organic material. This map shows areas of seismic risk from high (red) to low (grayish-green). When an earthquake happens there will not be time to google what you are supposed to do. Please visit our Geologic Information Portal and Geologic Hazard Maps page for the most up-to-date listing of all of our hazard maps. Most of the populated areas of the state have a 4080% chance of having an earthquake in the next 50 years. The map also shows potentially active faults from a separate 2014 report (click here to download). The Westport area is now the first in North America to have acommunity vertical evacuation structure, a building strong enough to resist earthquake and tsunami wave forces and give people a platform above the expected wave heights. Additionally, because the continent moves up and over the ocean plate, large amounts of sea water are displaced and cause damaging tsunamis. Resources on tsunami danger and preparedness in Westport, Grays Harbor County, Long Beach Peninsula, and Coastal evacuation maps. This photo shows a fence that was offset about 8.5 feet during the 1906 Great San Francisco Earthquake on the San Andreas fault. Sometimes Geologists can use the offset land surface to understand how much the fault moved during the earthquake. View of the Sunset Lake liquefaction failure about three weeks after the earthquake. In this photo, visitors to Green Lake Park near Seattle, Washington, have parked their bicycles as they look at the cracks made by the April 1949 earthquake. STAY THERE until the shaking stops. If you are in bed: STAY there and COVER your head and neck with a pillow. , * NOTE: Hazard maps for each jurisdiction will only be included if that jurisdiction is at risk to that hazard., Copyright Island County. All Rights Reserved 2021, Site Disclaimer Brick chimneys cascade off rooftops. Since their initial discovery, research has shown that the actual number of earthquakes is somewhere between 5 and 10 for each change in magnitude. Depending on the type of fault, the ground can move laterally, vertically, or a combination of both. The trench did expose faults, but it was not possible to conclusively demonstrate offset of Holocene units. In the early 2000s, USGS scientists including Brian Sherrod set out to further Johnsons work and better understand the slumbering fissure. The most important thing you can do before the next earthquake is to prepare. Transpressional deformation along the southern Whidbey Island fault is indicated by alongstrike variations in structural style and geometry, positive flower structure, local unconformities, out-of-plane displacements, and juxtaposition of correlative sedimentary units with different histories. The northwestern part of the fault zone forms the northeastern limit of the Port Townsend basin (Brocher and others, 2001 #4718). Quaternary Rupture of a Crustal Fault beneath Victoria, British The shaking usually lasts less than a minute and doesnt generally cause a tsunami or have many aftershocks. Scientists dont know. Identify and secure items in your home or work that could cause damage. Drop, Cover, and Hold On whenever you feel shaking. The age of the earthquake is learned by dating the organic material in these tsunami deposits. Theyre FREE CLICK HERE to subscribe, EAR TO THE GROUND WITH DNR & COMMISSIONER FRANZ, Tree Link helps you answer questions about urbantrees. When the ground shakes during an earthquake, it moves up and down, acting like additional gravity. Stay away from glass, windows, outside doors and walls, and anything that could fall down. The last large earthquake on the Cascadia subduction zone was in 1700. The continued movement along faults over millions of years can build mountains, tear a continent apart, and move tectonic plates thousands of miles. Standing becomes almost impossible as the jolts turn to rolling waves. That may not sound like much more than the magnitude 6.8 quake of 2001 based on the numbers, but that the Nisqually quake occurred some 30 miles underground. Using the stratigraphic column from the Freeport quadrangle map, confirm that you can recognize . South Whidbey Island Fault Earthquake Scenario: 7.4 Magnitude Buildings Damaged: 320,776 Fatalities: 90 - 432 Injuries: 2,920 - 7,361 Economic Loss: $15,590,000,000 SeaTac Fault Earthquake Scenario: 7.2 Magnitude Buildings Damaged: 375,954 Fatalities: 16 - 123 Injuries: 1,394 - 3,404 Economic Loss: $13,400,000,000 Tacoma Fault

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