Geophysicist
Geologic Hazards Science Center
Email:
ashumway@usgs.gov
Office Phone:
3032738402
ORCID:
0000000311427141
Location
P.O. Box 25046
Denver
, CO
802250046
US
Supervisor:
Mark D Petersen

Seismicity catalogs, GIS shapefiles, gridded seismic hazard curve data, gridded ground motion data, and mapped gridded ground motion values are available for the 2014 National Seismic Hazard Model for the Conterminous U.S. Probabilistic seismic hazard data and maps of the conterminous U.S. for peak ground acceleration (PGA) and 0.2 and 1.0 second spectral acceleration at probability levels of 2 percent in 50 years (annual probability of 0.000404) and 10 percent in 50 years (annual probability of 0.0021), assuming firm rock soil conditions at 760 m/s, are available. Hazard was calculated on a 0.05 degree by 0.05 degree grid, defined by a bounding box encompassing the conterminous U.S. (125 to 65 degrees longitude...
Tags: Conterminous U.S.,
EHP,
Earthquake Hazards Program,
GHSC,
Geologic Hazards Science Center, All tags...
Geophysics,
NEHRP site classes,
NSHM,
NSHMP,
National Seismic Hazard Model,
National Seismic Hazard Model Project,
Seismology,
U.S. Seismic Hazard Maps,
USGS,
USGS Science Data Catalog (SDC),
conterminous U.S.,
ground motion,
hazard curve,
hazard map,
spectral period, Fewer tags

These data sets are the results of calculations of hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. They represent the chance of experiencing potentially damaging ground shaking for fixed ground shaking levels that corresponds with MMI = VII. The values are obtained by averaging the probability of experiencing MMI = VII based on a peak ground acceleration value of 0.2152 g for site class D, and the probability of experiencing MMI = VII based on 1.0second spectral acceleration value of 0.2256 g for site class D. The data are for the Central and Eastern United States.

Gridded ground motion data and mapped gridded ground motion values are available for the 1999 Alaska Seismic Hazard Model. Probabilistic seismic hazard data and maps of Alaska and the Aleutians for peak ground acceleration (PGA) and 0.2, 0.3, and 1.0 second spectral acceleration at probability levels of 2 percent in 50 years (annual probability of 0.000404) and 10 percent in 50 years (annual probably of 0.0021), assuming firm rock soil conditions at 760 m/s, are available. Development of the 1999 Alaska Seismic Hazard Model is documented in the USGS OpenFile Report 9936 (https://doi.org/10.3133/ofr9936). This dataset is considered a legacy dataset. The original dataset was released at the time of publication...
Tags: Alaska,
Alaska,
EHP,
Earthquake Hazards Program,
GHSC, All tags...
Geologic Hazards Science Center,
Geophysics,
NEHRP site classes,
NSHM,
NSHMP,
National Seismic Hazard Model,
National Seismic Hazard Model Project,
Seismology,
U.S. Seismic Hazard Maps,
USGS,
USGS Science Data Catalog (SDC),
ground motion,
hazard curve,
hazard map,
spectral period, Fewer tags

A comparison of the 2017 USGS South America seismic hazard model with the Global Seismic Hazard Assessment Program (GSHAP) model and the 2010 USGS preliminary model was made to see how the models differ. The comparisons were made as ratios of PGA at 10% probability of exceedance in 50 years. Ratio maps of each comparison are included as a georeferenced tiff (GeoTIFF).

Seismicity catalogs, gridded seismic hazard curve data, gridded ground motion data, and mapped gridded ground motion values are available for the 2002 National Seismic Hazard Model for the Conterminous U.S. Seismicity catalogs are available for the western U.S. (in Mw) and central and eastern U.S. (in mb). Probabilistic seismic hazard data and maps of the conterminous U.S. for peak ground acceleration (PGA) and 0.1, 0.2, 0.3, 0.5, 1.0 and 2.0 second spectral acceleration at probability levels of 2 percent in 50 years (annual probability of 0.000404) and 10 percent in 50 years (annual probability of 0.0021), assuming firm rock soil conditions at 760 m/s, are available. Hazard was calculated on a 0.1 degree by 0.1...
Tags: Conterminous U.S.,
EHP,
Earthquake Hazards Program,
GHSC,
Geologic Hazards Science Center, All tags...
Geophysics,
NEHRP site classes,
NSHM,
NSHMP,
National Seismic Hazard Model,
National Seismic Hazard Model Project,
Seismology,
U.S. Seismic Hazard Maps,
USGS,
USGS Science Data Catalog (SDC),
conterminous U.S.,
ground motion,
hazard curve,
hazard map,
spectral period, Fewer tags

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