Maps Showing Seismic Landslide Hazards in Anchorage, Alaska
Scientific Investigations Map
3077
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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.
Suggested Citation
Jibson, R.W., Michael, J.A., 2009, Maps Showing Seismic Landslide Hazards in Anchorage, Alaska (Version 1.0): U.S. Geological Survey Scientific Investigations Map 3077, Report: iv, 11 p.; 2 Plates: each sheet 36 x 48 inches; Downloads Directory, https://doi.org/10.3133/sim3077.
ISSN: 2329-132X (online)
ISSN: 2329-1311 (print)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Maps Showing Seismic Landslide Hazards in Anchorage, Alaska |
| Series title | Scientific Investigations Map |
| Series number | 3077 |
| ISBN | 9781411324244 |
| DOI | 10.3133/sim3077 |
| Edition | Version 1.0 |
| Year Published | 2009 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Geologic Hazards Team |
| Description | Report: iv, 11 p.; 2 Plates: each sheet 36 x 48 inches; Downloads Directory |
| Projection | Universal Transverse Mercator |
| Scale | 25000 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | Y |