The Oso landslide occurred in an area of known landslide activity, but at the time of the slide, scientists had not researched the area to fully understand the geological history and various factors that lead to landslides of this magnitude. Seek out advisories and warnings during and after intense rainfall events. USGS published research includes maps showing the relative ages of landslides similar in style and geographically near Oso, models that showed how quickly the landside mobilized, and information about the expected response of the North Fork Stillaguamish River to the ongoing erosion of the millions of tons of material deposited as a result of the landslide. Mudflow is covered by flood insurance policies from the National Flood Insurance Program. Special coverage called a Difference of Condition policy is available for stand-alone purchase but is expensive and usually obtained from a broker in specialty lines of insurance. Posting comments is now limited to subscribers only. On Monday, the Washington State Department of Natural Resources issued a landslide advisory around the Puget Sound area and Olympic Peninsula, including Olympia, Tacoma and Seattle. Thorsen. They dissolve to liquid as more water is added. There is no specified time for reopening. If you are impacted by or suspect an active landslide, contact your county emergency manager or your local fire, police, or public works department. DNRs Geologic Information Portal, searchable by address, is one place to start. The Washington Geological Survey, a division of the Washington State Department of Natural Resources, published a new inventory of known landslides in the western two-thirds of King County today. They are usually composed of relatively loose or unconsolidated material. Other areas saw nearly half of the rain they'd expect to see for the month of January in one day, according to the weather service. Block slides are a type of translational slide that occur when large and relatively intact slabs of rock or earth are rapidly transported downslope. hide caption. USGS scientists are conducting aerial overflights to collect photographs and monitor river channel evolution through the landslide. Part of the neighborhood damaged by a slow-moving landslide in Kelso in 1998-99. Get a ground assessment of your property. The Washington Geological Survey, a division of the Washington State Department of Natural Resources, published a new inventory of known landslides in the western two-thirds of King County today. Other areas saw nearly half of the rain they would expect to see for January in one day. There are steps that can be taken to live more securely with our states landslide risk, DNR advises. A landslide can easily destroy or bury a car or house. In fact, precipitation in the area during February and March of 2014 was 150 to 200 percent of the long-term average. Rising water from the nearby Skookumchuck River begins to inundate several streets in the town of Bucoda, Wash., Friday, as area rivers and snow runoff begin to accelerate flooding in the south sound. chevron_right Volcanoes. They are often slow moving, but can also move rapidly. This buoyant force weakens the material and is also why your feet sink into beach sand after a wave washes over and adds water. Five Years Later - The Oso (SR 530) Landslide in Washington - USGS State agencies and local jurisdictions are coordinating resources to address damaged property and infrastructure, assess damage caused by the storms and implement repairs, he said. Run to the nearest high ground in a direction away from the path. She won the jackpot. The major route across Washington's Cascades I-90 over Snoqualmie Pass closed Thursday due to avalanche danger, heavy snow and low visibility. The addition of water can decrease friction, decrease strength, and increase the weight of the material. The National Weather Service said Hoquiam, Washington, received a record 5.78in of rain Thursday. Washington state landslide Downed power lines and parts of a destroyed house can be seen in the debris blocking the road near Oso on March 23. Jay Inslee issued an emergency proclamation on Friday because of severe winter storms going back to Dec. 17. Typically, of course, this event has effectively disappeared from the news, even in China - I can find no real updates on the recovery operations since the call for improvements in coal . (Photo courtesy of Washington State Archives), Washington Secretary of State The leading edge of the wet debris avalanche probably acquired additional water as it crossed the North Fork Stillaguamish River, ultimately transforming into a water-saturated debris flow. Washington State University canceled classes Monday and Tuesday to allow students ample time to return to Pullman in Eastern Washington following the severe winter weather, officials said on the university's website. Locations that experienced landslides in the past are more likely to have future landslides. Landslides nearly always move down a slope. Learn more and join our team! Landslides occur in all 50 states and U.S. territories and on average cause $1-2 billion in damages and more than 25 fatalities each year. Although there is still much to learn about the Oso landslide, USGS and other scientists have unraveled invaluable scientific information that is shedding light on how and why such landslides happen. Human action, such as construction, logging or road building that disturbs soils and slopes. Governors/Officers/Directors/Members/Managers, FAQ - Administration Dissolution/Termination, Election Cost Allocation and Reimbursement. Editor's note: This is a live account of weather updates from Thursday, Jan. 6, as the day unfolded.It is no longer being updated. Falls and topples are usually rapid, downward movement of large pieces of rock or debris. A USGS project to monitor the evolution of the new channel and the volumes of sediment transported by the North Fork Stillaguamish River, Earth and Planetary Science Letters article, Landslide Mobility and Hazards: Implications of the 2014 Oso Disaster, USGS article, Preliminary Interpretation of Pre-2014 Landslide Deposits in the Vicinity of Oso, Washington, Governor Inslees Joint SR 530 Landslide Commission, 12201 Sunrise Valley Drive The Tribal government declared a state of emergency for the region. The goal of USGS landslide science is to help answer questions such as where, when, and how often landslides occur and how fast and far they might move. In general, landslides can be categorized as shallow or deep-seated and this difference can determine their speed and size. USGS researchers are now nearing the conclusion of a five-year study that mapped the landslide in detail in order to understand the mobility of the event -- that is, to understand why the landslide traveled so far. The area overrun by the landslide was about one half square mile, and the landslide moved about 18 million tons of sand, till, and clay. Astoria got more than 4 inches (10.1 cm) of rain Thursday, breaking a record for rain on that date set in 1914. It is important to note that the type or size of landslide is largely irrelevant if you happen to be the one in harm's way. During the second stage of movement, the landslide greatly accelerated, crossed the North Fork Stillaguamish River, and mobilized to form a high-speed debris-avalanche. Since 2015, the Washington Geological Survey has maintained a Google map of recently reported landslides for the state. The hillsides history of slides dates back more than 60 years and some experts said they were shocked when homebuilding was permitted after a big slide in 2006. While gravity is the primary reason for a landslide, there can be other contributing factors, including: Commonly, landslides occur on slopes and in areas where they have taken place before, as well as in areas where they have not been previously documented. This is because the force of gravitywhich acts to move material downhillis usually counteracted by two things: (1) the internal strength of the material, and (2) the friction of the material on the slope. Landslide debris covered about 40 homes and other structures as well as nearly a mile of State Route 530. Shortly following the landslide, the USGS and partnering agencies provided near-real-time information on the potential for additional landslides and flood threats to search and rescue personnel. The spiders were placed on and near the landslide with helicopters.The USGS was also able to provide immediate data on water levels and river discharge from an existing permanent streamgage located downstream on the North Fork Stillaguamish River at Arlington. Sagging or taut utility lines; leaning telephone poles, deformed fences, or or tilting of trees on a hillside. chevron_right Seismic Scenarios. By clicking Sign Up, I confirmthat I have read and agreeto the Privacy Policy and Terms of Service. Live video from KING-TV appeared to show crews rescuing a person and working to extinguish a fire just outside the home. The landslide inventory for King County also includes an inventory of alluvial fans, fan-shaped features created by streams, floods or debris flows that leave sediment behind. Shallow Landslide Hazard Forecast website, Washington State Forest Practices Board Manual Evaluating Unstable Slopes, Washington State Landslide Insurance Page. The Legislature directed the Department of Natural Resources to identify and map landslides throughout Washington and disseminate the information to the public. Risk MAP - Washington State Department of Ecology There are hundreds of such slides across Washington, Hanell notes, that moved under different climate conditions and are presently dormant. 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