SEISMIC-HAZARD MAPS FOR THE CONTERMINOUS UNITED STATES, 2014 By Mark D. Petersen,1 Morgan P. Moschetti,1 Peter M. Powers,1 Charles S. Mueller,1 Kathleen M. Haller,1 Arthur D. Frankel,1 Yuehua Zeng,1 Sanaz Rezaeian,1 Stephen C. Harmsen,1 Oliver S. Boyd,1 Edward H. Field,1 Rui Chen,2 Nicolas Luco,1 Russell L. Wheeler,1 Robert A. Williams,1 Anna H. Olsen,1 and Kenneth S. Rukstales1 1 U.S. Geological Survey 2 California Geological Survey, Sacramento, Calif. 2015 U. S. Geological Survey Scientific Investigations Map 3325 ABSTRACT The maps presented here provide an update to the 2008 data contained in U.S Geological Survey Scientific Investigations Map 3195 (http://pubs.usgs.gov/sim/3195/). Probabilistic seismic-hazard maps were prepared for the conterminous United States for 2014 portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years. All of the maps were prepared by combining the hazard derived from spatially smoothed historical seismicity with the 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/s in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) 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 0.05 degrees in latitude and longitude. The grid of points was contoured to produce the final representation of the seismic-hazard. These maps are intended to summarize the available quantitative information about seismic ground motion hazard for the conterminous United States from geologic and geophysical sources. DISCLAIMERS Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. This database, identified as SIM 3325, has been approved for release and publication by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. CONTENTS 00readme.txt SIM3325_sheet1.pdf--map of peak horizontal acceleration with 10% probability of exceedance in 50 years SIM3325_sheet2.pdf--map of peak horizontal acceleration with 2% probability of exceedance in 50 years SIM3325_sheet3.pdf--map of horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years SIM3325_sheet4.pdf--map of horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years SIM3325_sheet5.pdf--map of horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years SIM3325_sheet6.pdf--map of horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years Datafiles SIM3325_1.zip peak horizontal acceleration with 10% probability of exceedance in 50 years uspga050arc.shp (.dbf/.prj./.sbn/.sbx/.shx) uspga050poly.shp (.dbf/.prj./.sbn/.sbx/.shx) uspga050pts.shp (.dbf/.prj./.sbn/.sbx/.shx) SIM3325_2.zip peak horizontal acceleration with 2% probability of exceedance in 50 years uspga250arc.shp (.dbf/.prj./.sbn/.sbx/.shx) uspga250poly.shp (.dbf/.prj./.sbn/.sbx/.shx) uspga250pts.shp (.dbf/.prj./.sbn/.sbx/.shx) SIM3325_3.zip horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years us5hz050arc.shp (.dbf/.prj./.sbn/.sbx/.shx) us5hz050poly.shp (.dbf/.prj./.sbn/.sbx/.shx) us5hz050pts.shp (.dbf/.prj./.sbn/.sbx/.shx) SIM3325_4.zip horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years us5hz250arc.shp (.dbf/.prj./.sbn/.sbx/.shx) us5hz250poly.shp (.dbf/.prj./.sbn/.sbx/.shx) us5hz250pts.shp (.dbf/.prj./.sbn/.sbx/.shx) SIM3325_5.zip horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years us1hz050arc.shp (.dbf/.prj./.sbn/.sbx/.shx) us1hz050poly.shp (.dbf/.prj./.sbn/.sbx/.shx) us1hza050pts.shp (.dbf/.prj./.sbn/.sbx/.shx) SIM3325_6.zip horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years us1hz250arc.shp (.dbf/.prj./.sbn/.sbx/.shx) us1hz250poly.shp (.dbf/.prj./.sbn/.sbx/.shx) us1hza250pts.shp (.dbf/.prj./.sbn/.sbx/.shx) Metadata.zip us1hz050arc.met--metadata for horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years, arcs us1hz050poly.met--metadata for horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years, polygons us1hz050pts.met--metadata for horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years, points us1hz250arc.met--metadata for horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years, arcs us1hz250poly.met--metadata for horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years, polygons us1hz250pts.met--metadata for horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years, points us5hz050arc.met--metadata for horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years, arcs us5hz050poly.met--metadata for horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years,polygons us5hz050pts.met--metadata for horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years, points us5hz250arc.met--metadata for horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years, arcs us5hz250poly.met--metadata for horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years, polygons us5hz250pts.met--metadata for horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years, points uspga050arc.met--metadata for peak horizontal acceleration with 10% probability of exceedance in 50 years, arcs uspga050poly.met--metadata for peak horizontal acceleration with 10% probability of exceedance in 50 years, polygons uspga050pts.met--metadata for peak horizontal acceleration with 10% probability of exceedance in 50 years, points uspga250arc.met--metadata for peak horizontal acceleration with 2% probability of exceedance in 50 years, arcs uspga250poly.met--metadata for peak horizontal acceleration with 2% probability of exceedance in 50 years, polygons uspga250pts.met--metadata for peak horizontal acceleration with 2% probability of exceedance in 50 years, points TO ACCESS THE DATA The data files can be downloaded via the web from http://pubs.usgs.gov/sim/3325 or from http://dx.doi.org/10.30133/sim3325. The map product is a Portable Document Format (.pdf) which requires Adobe Acrobat for viewing. Acrobat software runs on a variety of systems, and is available for download free of charge from Adobe at http://www.adobe.com. ArcReader is available free at: http://www.esri.com/software/arcgis/arcreader/. Software Recommended: Adobe Acrobat (6.x, 7.x, or 8.x), or Adobe Acrobat Pro (6.x, 7.x, or 8.x), or the free Adobe Reader (6.x, 7.x, or 8.x), 8.x is preferred. ArcGIS 10.0, or newer preferred.