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Seismic-hazard maps for Alaska and the Aleutian Islands

IMAP 2679

By:
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Abstract

Probabilistic seismic hazard maps were prepared for Alaska portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0.2, 0.3, and 1.0 second periods with probabilities of exceedance of 10% in 50 years and 2% in 50 years. This particular data set is for horizontal spectral response acceleration for 1.0 second period with a 10% probability of exceedance in 50 years. All of the maps were prepared by combining hazard derived from spatially- smoothed historic seismicity with hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP site classes B and C. This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0.1 degrees in latitude and longitude. The grid of points were contoured to produce the final representation of the seismic-hazard.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Seismic-hazard maps for Alaska and the Aleutian Islands
Series title:
IMAP
Series number:
2679
Subseries
GIS
ISBN:
0607937076 (Sheet 2)
Edition:
-
Year Published:
1999
Language:
ENGLISH
Description:
8 maps on 2 sheets :col. ;sheets 91 x 122 cm.
Scale:
7500000