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    Image Title  Abstract Category Last Updated
    Deep Landslide Susceptibility, Multnomah County This layer is a deep landslide susceptibility map. The symbology on this map includes high and moderate susceptibility zones. The deep susceptibility zones were established based upon location and proximity to deep landslide deposits and head scarps, buffers along the landslide head scarps, susceptible geologic units, slope angles, and mapper judgement following protocol developed by Burns (2008). Hazard 05/31/18 07:05 AM
    Historic Landslide Points, Multnomah County Historic Landslide Points, is a compilation of center points of published or known historic (roughly 1849-2016) landslides and any available information about these landslides including damage and losses and several other attributes within central and western Multnomah County, Oregon. Hazard
    Landslide Deposits This feature class consists of polygons delineating landslide deposits (including debris flow fans and talus extent). Hazard 02/22/19 08:37 PM
    Landslide Scarp Flanks This feature class represents polygons that delineate the hard scarps and scarp flanks. These head scarps or uppermost scarps in many cases expose the primary failure plane (surface of rupture) and flanks or shear zones. Hazard 01/07/19 05:02 PM
    Landslide Scarps Lines of the uppermost extent of landslide head scarp and any internal scarps within the body of the landslide. Hazard 01/07/19 05:04 PM
    Landslide Scarps and Flanks, Multnomah County This feature class represents polygons that delineate the head scarps and scarp flanks in central and western Multnomah County, Oregon. These head scarps or uppermost scarps in many cases expose the primary failure plane (surface of rupture) and flanks or shear zones. Hazard
    Landslide Scarps, Multnomah County This feature class represents lines of the uppermost extent of landslide head scarp and any internal scarps in the body of the landslide. Hazard
    Liquefaction Susceptibility This map shows liquefaction susceptibility for Oregon calculated following the methods of FEMA's 2011 HAZUS-MH MR4 technical manual. The map was prepared in support of a series of ground motion and ground failure maps for a scenario Magnitude 9.0 Cascadia Subduction Earthquake developed by the Oregon Department of Geology and Mineral Industries. The scenario maps were prepared for the Oregon Seismic Safety Policy Advisory Commission for its use in preparing a report to the 77th Oregon Legislative Assembly entitled " The Oregon Resilience Plan; Reducing Risk and Improving Recovery for the Next Cascadia Earthquake and Tsunami". Hazard 12/26/18 05:04 PM
    Liquefaction Susceptibility (Deep), Multnomah County A landslide inventory database was prepared by following the Protocol for Inventory Mapping of Landslide Deposits from Light Detection and Ranging (lidar) Imagery developed by Burns and Madin (2009). Using the lidar-based landslide inventory and several other data sets, a deep landslide (failure depth greater than 15 ft [4.5 m]) susceptibility map was created following a method developed by Burns and Mickelson (2016). Deep-landslide susceptibility zones were established from locations and proximity to deep-landslide deposits and head scarps, head scarp buffers, susceptible geologic units, slope angles, and mapper judgment. This map cannot serve as a substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from those shown on this map. The recommended map scale for this data is 1:8,000 as displayed on this map. Hazard 01/01/00 12:00 AM
    nehrp_drillholes_dogami Hazard 07/02/15 03:10 PM

       
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