DOGAMI OPEN-FILE REPORT SERIES

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Open-File Report O-21-14, Landslide, coseismic liquefaction susceptibility, and coseismic soil amplification class maps, Benton, Marion, Morrow, And Washington Counties, Oregon

by Robert W. Hairston-Porter, Ian P. Madin, William J. Burns, and Christina A. Appleby; 49 p. report, four Esri® geodatabases with internal metadata, external metadata in .xml format

What's in this report?
This report describes the methods and results of landslide, coseismic liquefaction susceptibility, and coseismic soil amplification class mapping in Benton, Marion, Morrow, and Washington Counties, Oregon. These maps can help communities better plan for disasters such as landslides and earthquakes.

Presentations

DOGAMI staff recorded virtual presentations for each of the counties that describes the work from this publication and the accompanying flood depth and channel migration zone maps in Open-File Report O-21-15 by C.A. Appleby and others (https://www.oregongeology.org/pubs/ofr/o-21-15/o-21-15.htm). These presentations are available at the following links:

Benton County Presentation

Marion County Presentation

Morrow County Presentation

Washington County Presentation

Report downloads:

· Report (49. p, 7.3 MB file)

· GIS data bundle: 4 geodatabases with metadata (21.0 MB, zip file)

· Complete publication bundle: report, geodatabases, and metadata (28.1 MB, zip file)

EXECUTIVE SUMMARY

This project was a cooperative technical partnership between the Oregon Department of Geology and Mineral Industries (DOGAMI) and the Federal Emergency Management Agency (FEMA) to map landslides and coseismic geohazards, including liquefaction susceptibility and National Earthquake Hazard Reduction Program (NEHRP) site classes, for Benton, Marion, Morrow, and Washington counties in Oregon. The geohazard data from this project will be used to aid in future natural hazard risk assessments, including loss estimates with FEMA’s Hazus software. The maps can also assist local governments with emergency preparedness and land-use planning.

Landslide maps for Marion County were separately released in 2020 as a part of Open-File Report O-20-12 by N. Calhoun and others (https://www.oregongeology.org/pubs/ofr/p-O-20-12.htm)

GEOGRAPHIC INFORMATION SYSTEM (GIS) DATA
Geodatabase is Esri® version 10.7 format. Metadata is embedded in the geodatabase and is also provided as separate .xml formatted files.

Each dataset listed below has an associated, standalone .xml file containing metadata in the Federal Geographic Data Committee Content Standard for Digital Geospatial Metadata format.

Dataset name	Description
Deposits	This polygon feature class represents landslide deposits (including debris flow fans and talus extent).
Scarps	This polyline feature class represents the uppermost extent of landslide head scarp and any internal scarps within the body of the landslide.
Scarp_Flanks	This polygon feature class represents head 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.
Liquefaction_Susceptibility	This polygon feature class represents liquefaction susceptibility during an earthquake, assuming full soil saturation. Liquefaction susceptibility classes were based on data from Youd and Perkins (1978).
NEHRP_Site_Class	Soil amplification classification, or ground motion amplification potential, is a rating that represents the National Earthquake Hazards Reduction Program (NEHRP) class assigned to geologic map units.
Reference_Table	This table provides a list of the sources for geologic data used in this study.