A polygon feature class that shows liquefaction zones. Earthquake Fault Maps in Seattle and Washington State Sometimes it is difficult to assess whether or not earthquake insurance is worth the price. See also: Land Use / Master Use Permit - Environmentally Critical Areas (ECA), Tree Protection Code. Tsunamis/ Seiches. See USGS Open-File Report 06-1064 for details concerning the identification of the threshold and its performance. Recent analysis has shown that the probability of landslides occurring on a day when the cumulative threshold has been exceeded is roughly 10%. Recently, the City of Seattle published a comprehensive map service to explain where, why, and how natural hazards are likely to strike in the city. Liquefaction … The houses on the hillside have more protection. But more seriously, 18%+ of all landslides in Seattle are the result of deep-seated landslides where where whole chunks of land will slide to the toe of a slope. (Shown: The newly opened Spark food truck park in the middle of the Mission Bay neighborhood.). Two majestic mountain ranges, the Olympics and the Cascades, rim the region. The USGS rates parts of the Iron Triangle neighborhood and north Richmond as having a "very high" chance of liquefaction. Seattle Liquefaction Color intensity indicates danger from earthquakes. title. Seattle Parks and Recreation GIS Map Layer Shapefile - Public Restroom Shapefile - This Seattle Parks and Recreation ARCGIS park feature map layer was exported from SPU ARCGIS and converted to a shapefile then manually uploaded to data.seattle.gov via Socrata. In the Pacific Northwest, the Juan de Fuca Plate plays a major role in shaping our coastlines and geography. The fill was compacted more than 50 years ago, when earthquake hazards were just beginning to be understood. The Cumulative Precipitation Threshold is (3-day Precipitation)=3.5 - 0.67*(15-day Precipitation). Lake Washington, Salmon Bay, and Lake Union are fortunately managed by the Hiram M. Chittenden Locks, which release water as needed. We hope you loved this article. ), Photograph showing a house that was damaged by a 1997 landslide along Perkins Lane in Seattle, Washington.
The risk of flooding is minimal at worst along those waterbodies.
Use our online map tool to see if your project is within the Shoreline District.
The maps aid the design professional by delineating areas where liquefaction could pose a significant hazard and should therefore be considered during facilities design. Reporter Mike Moffitt has been writing and editing stories for newspapers and news websites for more than 25 years.
This story map was created with the Story Map Series application in ArcGIS Online. (Shown: A decorated green bicycle secured in the back of a car is seen driving toward South Van Ness Avenue in San Francisco's Mission District.). Monthly donations are greatly appreciated from readers like you. Integrating real-time subsurface hydrologic monitoring with empirical rainfall thresholds to improve landslide early warning, Landslides, doi:10.1007/s10346-018-0995-z. Auburn and Poverty Bay. The rainfall intensity-duration threshold for the occurrence of landslides in the Seattle area is also based on an analysis of historical landslide and precipitation data from the period 1933 - 1997. Foster City, built on an engineered landfill, was one of the early developments of San Francisco Bay. Analysis of precipitation data associated with historical landslide events in Seattle has resulted in the identification of precipitation thresholds for the initiation of landslides.
Photograph showing head of a landslide in 1997 that eventually destroyed several homes near the south end of Perkins Lane in Seattle, Washington. Mirus, BB, JB Smith, RL Baum. Zoom in to or search for locations that are of interest to you. Looking at the map above, coastal areas where bluffs are common and the back sides of Queen Anne and the central hills exhibit the highest concentrations of landslide events. The USGS map does not claim to be accurate within 50 meters, nor does it distinguish between old, poorly engineered fill and more modern, engineered artificial fill zones. These dramatic natural features are products of dynamic forces... Empirical rainfall thresholds and related information form a basis for forecasting landslides in the Seattle area. The ECA regulations prior to the 2017 update apply if your project is within the Shoreline District, which includes all land within 200 feet of the shoreline, hydrologically connected wetlands, and all submerged land. Buildings that are built upon liquefaction zones could sink, topple, or even be overturned during an earthquake event. The Seattle Department of Construction & Inspections issues land use, construction, and trade permits, conducts construction- and housing-related inspections, ensures compliance with our codes, and regulates rental rules. Areas on the Elliott Bay could experience up to 5 meters (16 feet) tsunami, although the number is likely considerably lower. These earthquakes can happen anywhere along the local fault lines that emanate from the plates. The Seattle Fault, as it is known, could experience an earthquake with a magnitude up to 7.5. The epicenter was 60 miles south of the Marina, yet the quake still severely damaged or collapsed 70 buildings in the neighborhood. Sumner Dragovich, J. D.; Pringle, P. T., 1995, Liquefaction susceptibility for the Sumner 7.5-minute quadrangle, Washington, with a section on liquefaction by S. P. Palmer: Washington Division of Geology and Earth Resources Geologic Map Find out more at King County Public Health. Large swaths of Seattle are prone to liquefaction. Seattle Seismic Hazard Map. USA Earthquake Hazard Map… Seattle Fault Lines. Heck, many of them have “hill” in their name! Union City's liquefaction danger zone extends roughly from the city's eastern boundary near Quarry Lakes Regional Recreation Center northeast to Whipple Drive and Dyer Street. Although these commonly occurring landslides are typically triggered by subsurface hydrological processes, most early warning criteria rely exclusively on empirical rainfall thresholds and other indirect proxies for subsurface wetness. Due to the the shape of the Salish Sea and coastal landmasses of the Washington Coast and Vancouver Island, Seattle is fairly safe from any major tidal action associated with a Pacific Ocean tsunami. The home of rapper Tupac Shakur is deemed susceptible to heavy shaking by the USGS. Only modest shaking would be required to cause liquefaction of deposits mapped with Very High susceptibility.
Needless to say, areas like Interbay, Pioneer Square, the Duwamish industrial area, and even Magnolia and Queen Anne hills present serious risks to anyone within them during a major earthquake event. Mirus, B.B., Smith, J.B., Stark, Benjamin, Lewis, York, Michel, Abigail, and Baum, R.L., 2016, Assessing landslide potential on coastal bluffs near Mukilteo, Washington—Geologic site characterization for hydrologic monitoring: U.S. Geological Survey Open-File Report 2016–1082, 28 p., http://dx.doi.org/10.3133/ofr20161082.
2018. ), Photograph showing the scar left by a landslide on a hillside above the Burlington Northern Santa Fe Railway in Everett, Washington.
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