Impacts of Potential Seismic Landslides on Lifeline Corridors

This report presents a fully probabilistic method for regional seismically induced landslide hazard analysis and mapping. The method considers the most current predictions for strong ground motions and seismic sources through use of the U.S. Geological Survey (U.S.G.S.) seismic hazard curves in conjunction with topographic, geologic, and other geospatial information. Probabilistic landslide triggering analysis is performed based on Newmark’s sliding block theory. Because strength parameters are difficult to obtain in detail for a large regional area, friction angles for each lithological unit are estimated from histograms of the terrain slope at locations of previously mapped landslides within the unit. Afterwards, empirical models are used to predict the probability of a landslide triggering and the probability of horizontal displacement from a landslide exceeding specific thresholds (i.e., 0.1, 0.3, 1.0 m) relevant to engineering and planning purposes. The probabilistic landslide-triggering map is evaluated by comparing its predictions with previously mapped landslides from the Statewide Landslide Inventory Database of Oregon (SLIDO). Over 99.8% of the landslides in SLIDO are located in areas mapped with very high probability (i.e., 80-100%) of a landslide triggering. The created landslide hazard maps are suitable for regional resilience and planning studies by various agencies, as well as integration with maps of other types of hazards for probabilistic-based multi-hazard calculations and risk assessment. The maps should not be used in place of site-specific analyses, but may be used to prioritize where site-specific analyses and new geotechnical investigations are most needed. Finally, the maps can be used to identify which sections of the highway corridors would likely be least affected by landslides, enabling it to serve as a lifeline route.

• Record URL:
  http://www.oregon.gov/ODOT/Programs/ResearchDocuments/SPR740SeismicLandslides.pdf
• 
• Corporate Authors:

  Oregon State University, Corvallis

  School of Civil and Construction Engineering
  Corvallis, OR  United States  97331

  Oregon Department of Transportation

  Research Section
  555 13th Street NE
  Salem, OR  United States  97301

  Federal Highway Administration

  400 Seventh Street, SW
  Washington, DC  United States  20590-0003
• Authors:
  • Olsen, Michael J
  • Ashford, Scott A
  • Mahlingam, Rubini
  • Sharifi-Mood, Mahyar
  • O'Banion, Matt
  • Gillins, Daniel T
• Publication Date: 2015-2

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; References; Tables;
• Pagination: 238p

Subject/Index Terms

• TRT Terms: Forecasting; Highway corridors; Landslides; Lifelines; Mapping; Maps; Risk assessment; Seismicity
• Geographic Terms: Oregon
• Subject Areas: Geotechnology; Highways; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 01556723
• Record Type: Publication
• Report/Paper Numbers: FHWA-OR-RD-15-06
• Contract Numbers: SPR 740
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Mar 12 2015 7:53AM