Item talk:Q57415

From geokb

{

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     "name": "Additional period and site class maps for the 2014 National Seismic Hazard Model for the conterminous United States",
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     "dateModified": "2018-09-12",
     "abstract": "The 2014 update of the U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for the conterminous\u00a0United States (2014 NSHM; Petersen and others, 2014, 2015) included probabilistic ground motion maps for 2 percent and\u00a010 percent probabilities of exceedance in 50 years, derived from seismic hazard curves for peak ground acceleration (PGA) and\u00a00.2 and 1.0 second spectral accelerations (SAs) with 5 percent damping for the National Earthquake Hazards Reduction Program\u00a0(NEHRP) site class boundary B/C (time-averaged shear wave velocity in the upper 30 meters [VS30]=760 meters per second\u00a0[m/s]). We now provide uniform NEHRP site class maps for 2, 5, and 10 percent probabilities of exceedance in 50 years derived\u00a0from hazard curves for additional spectral periods. For the central and eastern United States (CEUS) and western United States\u00a0(WUS), hazard curves and maps for PGA, 0.1, 0.2, 0.3, 0.5, 1.0, and 2.0 second SAs are now available. The WUS additionally\u00a0includes hazard curves and maps for 0.75, 3.0, 4.0, and 5.0 second SAs. The use of region-specific suites of weighted ground\u00a0motion models (GMMs) in the 2014 NSHM precluded the calculation of ground motions for a uniform set of periods and site\u00a0classes for the conterminous United States. At the time of the development of the 2014 NSHM, there was no consensus in the\u00a0CEUS on an appropriate site-amplification model to use; therefore, we calculated hazard curves and maps for NEHRP site class A,\u00a0for which most stable continental GMMs were originally developed, based on simulations for hard rock site conditions (VS30=2,000 m/s).\u00a0In the WUS, however, the active crustal Next Generation Attenuation Relationships for the WUS (NGA-West2 GMMs) and\u00a0subduction GMMs allow amplification of ground motions based on site class (defined by VS30); so we calculated hazard curves\u00a0and maps for NEHRP site classes B (VS30=1,080 m/s), C (VS30=530 m/s), D (VS30=260 m/s), and E (VS30=150 m/s) and site class\u00a0boundaries A/B (VS30=1,500 m/s), B/C (VS30=760 m/s), C/D (VS30=365 m/s), and D/E (VS30=185 m/s). The 2014 NSHM introduced\u00a0a set of criteria for selecting GMMs for use in the NSHMs. When calculating additional period and site class maps, we verified\u00a0whether the 2014 NSHM original suites of GMMs satisfied these ground motion selection criteria at all additional periods and\u00a0site classes using GMM magnitude-distance scaling relation plots. Results of our analysis show that certain GMMs give unrealistic\u00a0results at longer periods, distances, and softer soils in the WUS. In these rare instances, the GMM was removed from the original\u00a0suite of GMMs (for all periods and site classes) and the weights of the remaining GMMs in the suite were renormalized. Ratio\u00a0maps show these updated suites of weighted GMMs result in probabilistic ground motion changes of less than 10 percent in\u00a0the WUS at PGA, as well as 0.2 and 1.0 second SAs, except in the Pacific Northwest, where differences as much as 20 percent\u00a0are seen. Hazard curves and uniform hazard response spectra at test sites across the conterminous United States were produced to\u00a0verify that results were reasonable. The additional period and site class maps, and the hazard curves from which they were derived,\u00a0are available for download from the USGS ScienceBase Catalog.",
     "description": "Report: v, 46 p.; Data release",
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         "name": "Shumway, Allison ashumway@usgs.gov",
         "givenName": "Allison",
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         "name": "Petersen, Mark D. mpetersen@usgs.gov",
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         "name": "Rezaeian, Sanaz srezaeian@usgs.gov",
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