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The intent of this dataset is to depict landslide deformation from a M9 earthquake on the Cascade Subduction Zone within the Portland Water Bureau (PWB) service area and corridors along the conduits leading from the Bull Run watershed.
Evaluating the potential for liquefaction and employing methods to mitigate its impacts were recognized as key factors for increasing earthquake resilience in the Oregon Resilience Plan (OSSPAC, 2013), as well as previous earthquake risk studies. Delineation of liquefaction-susceptible deposits in the PWB service area and estimating the magnitude of potential ground deformation is essential for the evaluation of potential damage from future large earthquakes in the Portland area. Mapping of liquefaction hazard allows for planning and mitigation prior to the next large earthquake and can be used for prioritizing emergency response following the earthquake.
This dataset represents landslide deformation for the City of Portland Water Bureau service area and the conduit corridors leading from the Bull Run Watershed. Data are classified into ranges. Water bodies were removed. Complete methodology for landslide deformation can be found in the accompanying memorandum report for the "Portland Water Bureau Water System Seismic Study: Landslide Deformation for M9.0 Cascadia Earthquake Map," version 2.0, 2016. |