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SEISMIC LANDSLIDE HAZARDS ANCHORAGE, AK

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Product Details

Product Number
210867
Series
SIM-3077
Scale
1:25,000
Alternate ID
SIM3077
ISBN
978-1-4113-2424-4
Authors
RANDALL JIBSON W
Version Date
01/01/2009
Regions
AK
Countries
USA
Media
Paper
Format
Folded

Additional Details

Description
7/14/2009 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.
Survey Date
2009
Print Date
2009
Height In Inches
50.000
Length In Inches
38.000
Boundary Type
Geographic Unit
Two Sided
No
Pieces
3
Languages
English
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