SEISMIC-HAZARD MAPS FOR HAWAII U.S. Geological Survey Geologic Investigations Series 2 sheets, scale 1:2,000,000 DESCRIPTION Probabilistic seismic hazard maps were prepared for Hawaii 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. There are two map sheets for this publication, each sheet portraying the same probability level for the four different accelerations. 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 0.02 degrees in latitude and longitude. The grid of points were contoured to produce the final representation of the seismic-hazard. There are eight different digital geospatial data sets available of the seismic hazard in Hawaii. The data can be downloaded in either Arc/INFO export format or Spatial Data Transfer Standard (SDTS) format. AVAILABLE DATA SETS: hipga050 peak horizontal acceleration, 10% probability of exceedance in 50 years hi1hz050 1.0 second horizontal spectral response acceleration 10% probability of exceedance in 50 years hi3hz050 0.3 second horizontal spectral response acceleration 10% probability of exceedance in 50 years hi5hz050 0.2 second horizontal spectral response acceleration 10% probability of exceedance in 50 years hipga250 peak horizontal acceleration 2% probability of exceedance in 50 years hi1hz250 1.0 second horizontal spectral response acceleration 2% probability of exceedance in 50 years hi3hz250 0.3 second horizontal spectral response acceleration 2% probability of exceedance in 50 years hi5hz250 0.5 second horizontal spectral response acceleration 2% probability of exceedance in 50 years LOCATION OF DATA SETS The Arc/INFO export files are located at: ftp://greenwood.cr.usgs.gov/pub/i-maps/i-2724/arc/ Each export data file uses the name of one of the data sets listed above, and has an extension of .e00. For example, the 1.0 second horizontal spectral response acceleration with 10% probability of exceedance in 50 years export data file is named hi1hz050.e00. The SDTS files are located at: ftp://greenwood.cr.usgs.gov/pub/i-maps/i-2724/sdts/ Each SDTS file uses the name of one of the data sets listed above, and has an extension of .tar. For example, the 1.0 second horizontal spectral response acceleration with 10% probability of exceedance in 50 years SDTS data file is named hi1hz050.tar. These data files are in 'tar' (tape archive) format and can be extracted using the tar utility on UNIX, or WinZip on Windows.