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Build a Better Wall FEMA (Federal Emergency Management Administration) and CEETEP (Cascadia EarthScope Earthquake and Tsunami Education Program). Lateral spreads occur on very low-angle slopes toward a free face such as a cliff or embankment. Shallow landslides typically occur during the winter months in western Washington and during the summer months in eastern Washington, but are possible at any time. Translational slides can contain loose sediments or large slabs of bedrock. Clicking the icon to the right will take you to the forecast map page. How can we design buildings to withstand an earthquake? Irrigation , deforestation , excavation , and water leakage are some of the common activities that can help destabilize, or weaken, a slope. These types of landslides are often called 'mudslides' by the news media. Distributions of landslide activity can be advancing, retrogressive, enlarging, diminishing, confined, moving, widening. The Aldercrest–Banyon landslide complex was active for nearly a year and eventually destroyed 138 homes. Earthquake Hazard Inventory & Mitigation Planning Bonnie Magura (Portland Public Schools), CEETEP (Cascadia EarthScope Earthquake and Tsunami Education Program), and ANGLE Project In this two-part activity, students/participants first: - Complete a Hazard Inventory for their city or area of interest in the event of a magnitude 7 or larger earthquake and tsunami. A more comprehensive list of significant landslides in Washington is available here. Also check out Ear to the Ground, published by the Department of Natural Resources. A volcanic eruption can rapidly melt snow and ice, causing a deluge of rock, soil, ash, and water that accelerates down the slopes of a volcano, devastating anything in its path. The higher landslide activity was attributed, for the earlier period to an increase in temperature and permafrost melting at high elevations, and for the latter period to human action (mainly deforestation) and to an increase in precipitation. Examples are from the Pacific Northwest, USA's most tsunami-vulnerable communities away from high ground, but it could be adapted to any region with similar vulnerability. Indirect costs, such as loss of property value and tax revenue, and environmental effects, such as the degradation of water quality, can exceed direct costs. These type of landslides can be large and damaging and occur where alternating layers of strong and weak rock slope downhill. Includes Alaska and San Francisco examples. Shallow Landslide Hazard Forecast website, Washington State Forest Practices Board Manual Evaluating Unstable Slopes, Washington State Landslide Insurance Page. Assessing Hazards, Vulnerability, and Risk, All Hazards related materials from across Teach the Earth, Schedule of Upcoming Workshops and Webinars, Associate Editor responsibilities and qualifications, Short URL: Upcoming registration deadlines for the NAGT Webinar Series! The addition of water to material on a slope can make landslides more common. The mission of The Geological Society of America is to advance geoscience research and discovery, service to society, stewardship of Earth, and the geosciences profession. They may contain more coarse material than a mudflow when channelized. This is because the force of gravity—which acts to move material downhill—is usually counteracted by two things: (1) the internal strength of the material, and (2) the friction of the material on the slope. They typically do not mobilize far and sometimes move like a snow avalanche.

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