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Scientific Investigations Map 3077

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## Maps Showing Seismic Landslide Hazards in Anchorage, Alaska

#### By Randall W. Jibson and John A. Michael

| Abstract
The devastating landslides that accompanied the great 1964 Alaska earthquake showed that seismically triggered landslides are one of the greatest geologic hazards in Anchorage.  Maps quantifying seismic landslide hazards are therefore important for planning, zoning, and emergency-response preparation.  The accompanying maps portray seismic landslide hazards for the following conditions:  (1) deep, translational landslides, which occur only during great subduction-zone earthquakes that have return periods of ≈300–900 yr; (2) shallow landslides for a peak ground acceleration (PGA) of 0.69 g, which has a return period of 2,475 yr, or a 2 percent probability of exceedance in 50 yr; and (3) shallow landslides for a PGA of 0.43 g, which has a return period of 475 yr, or a 10 percent probability of exceedance in 50 yr.  Deep, translational landslide hazard zones were delineated based on previous studies of such landslides, with some modifications based on field observations of locations of deep landslides.  Shallow-landslide hazards were delineated using a Newmark-type displacement analysis for the two probabilistic ground motions modeled.     | Revised November 12, 2009

First posted June 11, 2009
-  **Pamphlet** PDF (122 kB) 
-  **Sheet 1** PDF (30.9 MB) 
-  **Sheet 2** PDF (28.4 MB) 
-  **Downloads** Directory  Contains: associated database files. Refer to the Readme and Metadata files for more information. 

**For additional information contact:**Science Center Chief Scientist,USGS Geologic HazardsBox 25046, Mail Stop 966Denver, CO 80225http://geohazards.cr.usgs.gov/

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### Suggested citation:

Jibson, R.W., and Michael, J.A., 2009, Maps showing seismic landslide hazards in Anchorage, Alaska: U.S. Geological Survey Scientific Investigations Map 3077, scale 1:25,000, 11-p. pamphlet. [Available at URL https://pubs.usgs.gov/sim/3077]

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U.S. Department of the Interior |            U.S. Geological Survey           	URL: *http://pubsdata.usgs.gov/pubs/sim/3077/index.html*            Page Contact Information: GS Pubs Web Contact           	Page Last Modified: Thursday, 01-Dec-2016 17:17:38 EST