Seismic-Hazard Maps for Alaska and the Aleutian Islands: 3HZ050

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 0.3 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.