| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 97594 |
| Citation Author: | Jibson, Randall W.; Michael, John A. |
| Citation Contributing Office: | Geologic Hazards Team |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | Version 1.0 |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0611600 |
| Citation LatS: | 0610000 |
| Citation LonE: | -1494000 |
| Citation LonW: | -1500500 |
| Citation Month: | |
| Citation No Pagination: | N |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | N |
| Citation Phsyical Description: | Report: iv, 11 p.; 2 Plates: each sheet 36 x 48 inches; Downloads Directory |
| Citation Projection: | Universal Transverse Mercator |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3077 |
| Citation Search Results Text: | Maps Showing Seismic Landslide Hazards in Anchorage, Alaska; 2009; SIM; 3077; Jibson, Randall W.; Michael, John A. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Maps Showing Seismic Landslide Hazards in Anchorage, Alaska; 2009; SIM; 3077; Jibson, Randall W.; Michael, John A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3077/ |
| Date Other: | Sat, 13 Jun 2009 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
