southern whidbey island fault map

Theres a must-see documentary film called Cascadia The Big One that exposes whats currently going on in this region of the Cascade volcanoes and the Pacific NorthWest. This part of the Japanese coast had not seen this type of seismic rupture in some 800 years, and what failed was that walls built to keep tsunami waves were not high enough. The team determined that the Rattlesnake Mountain fault zone, originally mapped by DNR geologist Tim Walsh in the 1980s, is likely the southern continuation of the southern Whidbey Island fault, extending this fault zone from the Strait of Juan de Fuca to Rattlesnake Mountain near North Bend. It is a qualitative scale that ranges from IXI (1-11) and measures the amount of damage caused by an event. Fault Activity Map of California The key, Sherrods group would discover, was buried on Whidbey Island under layers of mud, peat moss and decaying marsh grass in the murky tidal waters at Crockett Lake, alongside the Coupeville ferry dock. The team also found that accumulated movement on the fault has uplifted old Snoqualmie River sediments to their current position on ridges, in some places several hundreds of feet above the modern Snoqualmie valley floor. southern Whidbey Island fault zone (Class A) No. One of these cracks appeared along the pathway around Green Lake. Everything points to one thing, Sherrod said, waving his hand across the inland sea. When the landslide hit the water it may have created a tsunami. Hold on to any sturdy shelter until the shaking stops. Map by And while scientists keep digging for more information and more situational awareness of what we face, the other problem is human. Learning earthquake faults around where we live is a first good way to prepare the next devastating earthquake. The faults length depends on whom you ask, Sherrod said. Around Puget Sound, it seems everyone knows about The Big One, the potential magnitude 9.0 Cascadia Subduction Zone megaquake some scientists say is due any day. Its just the way scientists work, he said. Landslides can be caused by strong ground shaking during an earthquake. As of January 12, 2017, the USGS maintains a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. The tsunamis can travel far inland and deposit layers of sand and organic material. The ground shaking from these earthquakes can last for several minutes. The Seattle Fault is also likely to create a tsunami that would inundate Harbor Island and much of SODO, Interbay, and the waterfront. Plate Tectonics | Pacific Northwest Seismic Network Years ago, Howard Gower and James Yount came to the Puget lowlands to study earthquake risks and stumbled on what appeared to be a fault in Island and Snohomish counties. Quake fault under Whidbey linked to potential mainland dangers Johnson and others (1996 #4751) described the structure and stratigraphy of the southern Whidbey Island fault zone. Oblique convergence and clockwise rotation along the continental margin are the inferred driving forces for ongoing deformation. 1 NE 7th Street These faults and earthquakes usually occur at great depth (tens to hundreds of miles). These older faults do not have any evidence for recent activity, but the Earth is always changing. Walsh said that Whidbey Island through the years has been subjected to a number of small quakes, roughly 2 or 3 on the Richter scale. Earthquakes can be measured in many ways, but the most accepted method is called moment magnitude. 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 Photo from, This image shows the how the 1700 AD tsunami from the Pacific Northwest crossed the Pacific Ocean. Within this rich oral history there are many references to events like earthquakes and tsunamis. Sherrods son has since completed graduate school in applied geosciences. The fault probably originated during the early Eocene as a dextral strike-slip fault along the eastern side of a continental-margin rift. The fault, not so much. Whidbey fault quake potentially a bigger 'Big One' M 7.4 Scenario Earthquake - Southern Whidbey Island fault-southern Overview Interactive Map Regional Information Impact ShakeMap Technical Origin Download Event KML Earthquakes Hazards Data & Products Learn Monitoring Research M 7.4 Scenario Earthquake - Southern Whidbey Island fault-southern 2017-05-12 20:14:09 (UTC) 48.036N 122.452W Because after a region-wide event, it could take that long for help to come from the rest of the country and world. Click the "Seismogenic Features" button in the Map Contents window to display faults and earthquakes. The term active can have different meanings. Ready to retrofit? Scientists dont know. The threat to Puget Sound from a quake along the Cascadia Subduction Zone, off the coast of Washington, Oregon and California, is well documented. This is sometimes called "The Big One" by news media. This means that when the Seattle fault ruptures the south side of the fault moves up relative to the north side. California Geological Survey. The fault zone, known to geologists as SWIF, cuts through Puget Sound in a diagonal line roughly from Port Townsend to the southern tip of Whidbey Island, then to Mukilteo, Bothell, North Bend and possibly farther east below the Cascades. Using the stratigraphic column from the Freeport quadrangle map, confirm that you can recognize . Small normal faults are found along the top of folds in eastern Washington in the Saddle Mountain graben. The marshy deposits are about a meter higher at Lake Hancock. Seattle's Faults: Maps That Highlight Our Shaky Ground In fact, new faults are found every year during our geologic mapping efforts. The material becomes so weak that it behaves more like a liquid than a solid. They knew something was there, said Sam Johnson, a retired USGS geologist who would follow up on their work. Stories from tribes near Seattle have also helped us to learn that the last earthquake on the Seattle fault was about AD 900950. Notable earthquakes in bold happened in Washington. It startled Johnson that such massive faults had gone undetected for so long. All faults, regardless of size, can be dangerous if they rupture. This is a very good example of a strike-slip fault. Over time, fault movement has created some interesting geologic features. A major southern Whidbey quake, on the other hand, could kill and injure many more, according to Murphy. PDF Cretaceous-Jurassic accreted terrains - University of Washington The more you know what to expect, the better prepared you will be to help yourself, your family, and others around you. The buildings in this photo were built on soft materials that liquefied during the 1964 Niigata earthquake in Japan. By clicking Accept, you consent to the use of ALL the cookies. A magnitude 7.4 along the southern Whidbey fault would rattle 18 counties in Washington, according to a federal projection . Southeast Extension of the Southern Whidbey Island Fault PDF Holocene Fault Scarps and Shallow Magnetic Anomalies Along the Southern from Whidbey Island to Vancouver Island (Figure 1). Never use a lighter or match near damaged areas. In places where there is little vegetation, different rock types and faults can be found with relative ease. ShakeMapGeologicSummaries - University of Washington Consider subscribing to our blog, Washington State Geology News, to receive notifications when new information is published. The Survey works to increase public and scientific understanding of fault and earthquake hazards in our state. Fault Activity Map of California. Buildings could sustain extensive damage. Latest earthquakes map and list (past 24 hours, M2.5+) from the ANSS (Advanced National Seismic System). We also use third-party cookies that help us analyze and understand how you use this website. At the Brightwater treatment plant in Woodinville and at Crystal Lake in Maltby, the government researchers found telltale slopes of offset ground, known as scarps, indicative of a long-ago quake. He said he believes dramatic shifts from that quake also may be visible on the western edge of Camano Island. Many universities and other organizations (such as Cascadia Region Earthquake Working Group and the Pacific Northwest Seismic Network) also work to understand active faults in Washington. Geologists do not yet know how often earthquakes happen on this fault. By finding the age of the deformed layer, a paleoseismologist can determine the minimum age of the fault. These types of faults are common, but usually small. <> At the Washington Geological Survey, active means that a fault has evidence for movement within the Holocene time period (since about 12,000 years ago). Stay away from glass, windows, outside doors and walls, and anything that could fall down. 1 School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8P 5C2, Canada 2 Department of Earth and Environment, Boston University, Boston, Massachusetts 02215, USA What about the localized tsunami risk? Maps. Each of the earthquakes listed on the bottom of the screen is capable of significant damage. For example, a M7 earthquake releases 32 times more energy than a M6 earthquake, and 1,000 times more than a M5 earthquake. The 2011 Tohoku earthquake in Japan occurred on this type of fault and released enough energy to slightly change the Earths axis of rotation. They conclude the observed features have a glaciotectonic origin and are not seimotectonic. Puget Sound faults - Wikipedia This is an active fault.. This date was confirmed by records in Japan of an orphan tsunami and by many lines of geologic evidence. In some areas getting up a hill to higher ground will be difficult. This movement happens because stress builds up as tectonic plates move. Throughout the world shallow earthquakes generally refer to earthquakes that are less than ~45 miles deep. <>>> Photo from Pacific Northwest Seismic Network Seismo Blog. 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. Kelsey and others (2004 #7651) suggest that the earthquake resulted in 2.5 m uplift of the salt marsh on the north side of the fault strand relative to the marsh on the south side; no fault scarp has been identified between the marshes. The northwestern part of the fault zone forms the northeastern limit of the Port Townsend basin (Brocher and others, 2001 #4718). They didnt recognize the significance of what they found. The San Andreas fault in California is a good example of a very active strike-slip fault. In fact, until the 1980s, no one knew SWIF existed. Even if the earthquake is too small to be felt by people, seismographs can detect it. Despite its location well offshore, a Cascadia quake would likely kill at least 10,000 and injure more than 30,000 in Washington, Murphy found. PDF The Cottage Lake Aeromagnetic Lineament: a Possible Onshore Extension " A lot of people are transplants, " Forson said. Many faults have not been studied enough to know if they are active. HAZARD MAPS As part of the Hazard Mitigation Planning process, mapping of the hazards that have the potential to affect the jurisdiction is performed using geographic information systems (GIS) software. Experts believe a magnitude 9.0 could happen there anytime in the next 200 years or so. Videos: Strong M6.0 earthquake rattles Mindanao in the Philippines, Dramatic earthquake increase in Hawaii! Although we know much about active faults and earthquakes, there is much more to learn. A damaging earthquake is inevitable on this fault, but we do not know exactly when it will happen. During the shaking liquefaction occurred, the sand lost its strength, and the car sunk. Please visit our Geologic Information Portal and Geologic Hazard Maps page for the most up-to-date listing of all of our hazard maps. PDF Modeling a Magnitude 7.4 Earthquake on the Western Section of the Most are too small to be felt or cause damage. The buildings sank when ground shaking weakened the underlying sediments. Scientists are not sure how far east it goes. This earthquake caused parts of Restoration Point near on Bainbridge Island to be lifted 35 feet straight up. If the epicenter is Everett, the SWIF could cause. Most are too small to be felt or cause damage. There are many other active faults in Washington and any of these could produce a large earthquake in the future. There are also tsunami evacuation signs on the highways. This kind of landslide is called an earthquake-triggered landslides. Be prepared and read more on DNR, USGS, King5, Strange Sounds and Steve Quayle. You can look at different geological hazard mapson the website of the Department of Natural Resources. The shaking usually lasts less than a minute and doesnt generally cause a tsunami or have many aftershocks. Official websites use .gov Like a sonogram, the seismic surveys allowed Johnson to see outlines of massive fissures in the earths crust. Earthquakes, tornadoes, hurricanes, pandemics, too many people think it cant happen to them and they still think that they can still make a quick run to Walmart to pick up enough to last for 2-3 days and then the govt. And what were looking at is water.. This map is from a 2007 report on the seismic design categories in Washington. In much of Washington, dense vegetation covers the land and makes finding faults very difficult. In the area of North Bend, the fault zone is 4 miles wide and consists of a series of parallel faults. This map of Puget Sound shows the location of the methane plumes (yellow and white circles) detected along the ship's path (purple). On an inactive fault, the sea would have risen at the same rate at both locations. Snohomish, King and Island counties would be expected to see the. With Medical Martial Law imposed in Washington state. Tsunamis and seiches are destructive waves which can be triggered by certain types of large earthquakes. USA Earthquake Hazard Map. Trenches by Sherrod and others, 2008 #7652) are less than 1 km south of KP1 and KP2 and Sherrod and others (2008 #7652) conclude that deformation in the area is due to surface-rupturing earthquakes. The bluff, where the cabins now sit, could have jutted up in the most recent Whidbey fault quake, Sherrod said. The risk is complicated, but there are millions of people who live in the Seattle area, said Forson. SWIF ranges from 12 miles underground at its deepest to right at sea level in a few scattered spots, like Cama Beach, Holmes Harbor and Woodinville, according to Sherrods research. Tap/click on "gear icon" for options and settings. Emergency planners all had a simple message: Its not IF a disaster will happen, its WHEN. Hover over a cluster of earthquakes to learn about the different types in the Pacific Northwest. Most injuries occur when people inside change rooms or try to leave the building. But quiet period wont last, Strongest earthquake in 40 years rattle residents of Buffalo, NY, Is Istanbul next? Earthquakes on shallow faults typically last 20 to 60 seconds and the shaking is localized to the general area of the fault. Additionally, because the continent moves up and over the ocean plate, large amounts of sea water are displaced and cause damaging tsunamis. Every year Western. Black squares are urban sewer outfalls, which don't match the bubble plumes' locations. Photo from, Liquefaction can be a big problem. Avoid stopping near or under buildings, trees, overpasses, or utility wires. Although we cannot predict exactly when the next earthquake will happen, we can predict the general distribution of earthquake sizes. HOLOCENE FAULT SCARPS AND SHALLOW MAGNETIC ANOMALIES ALONG THE SOUTHERN WHIDBEY ISLAND FAULT ZONE NEAR WOODINVILLE, WASHINGTON By Brian L. Sherrod1, Richard J. Blakely2, Craig Weaver1, Harvey Kelsey3, Elizabeth Barnett1, and Ray Wells4 1 U.S. Geological Survey, Dept. Seismic waves travel at hundreds to thousands of miles per hour and quickly reach the surface where they are felt or measured. Other faults are inactive and are left over from much older periods of deformation. But they didnt document it hardly at all.. All Rights Reserved 2021, Site Disclaimer The last large earthquake on the Cascadia subduction zone was in 1700. Washington, Seattle, WA 98195 2 U.S. Geological Survey, 345 Middlefield Road, M/S . Kristin D. Morell 1 *, Christine Regalla 2, Lucinda J. Leonard 3, Colin Amos 4, Vic Levson 5. The 1949 earthquake near Tacoma triggered a landslide near the Tacoma Narrows that caused a local tsunami. Finding nothing of serious monetary value, the companies abandoned reams of information they had gathered through seismic surveys. Then consider that the Seattle Fault is a complex of faults with various branches that run at or just below the surface. Faulting produced warping at the site of greater than 2 m. Radiocarbon ages provide a maximum age for the folding event of 12,09011,670 cal yr BP. Much of the land along the southwestern part of the lake cracked and subsided. Once a fault is located, it is important to know if it is active. But it didnt. 2 0 obj What are the most dangerous fault lines for Seattle? Strabge sounds very good report thanks a lot. Although both seiches and tsunamis can be large and destructive, they are created differently. Since the last ice age, the southern Whidbey Island fault zone has probably spawned several highly destructive shallow earthquakes. Emergency Management Earthquake - Island County, Washington For more information about earthquakes, faults, and emergency preparation, consider visiting the following sites: This map shows areas of seismic risk from high (red) to low (grayish-green). An increase of 2 means that ~1,000 times more energy is released. Stop as quickly as safety permits and stay in the vehicle. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The western half of Washington state is considered earthquake country, with the potential for very large quakes. It could also create dangerous currents and hazards to the north including Everett. You will not be able to google what to do in an earthquake when it is happening. , * NOTE: Hazard maps for each jurisdiction will only be included if that jurisdiction is at risk to that hazard., Copyright Island County. Sometimes there may be a layer of volcanic ash or charcoal that has been deformed by the fault.

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