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The 2002 U.S. Geological Survey (USGS) National Seismic Hazard Maps display earthquake ground motions for various probability levels across the United States and are applied in seismic provisions of building codes, insurance rate structures, risk assessments, and other public policy. This update of the maps incorporates new findings on earthquake ground shaking, faults, seismicity, and geodesy. The resulting maps are derived from seismic hazard curves calculated on a grid of sites across the United States that describe the frequency of exceeding a set of ground motions.
Types: Citation;
Tags: B/C site class boundary,
EHP,
Earthquake Hazards Program,
GHSC,
Geologic Hazards Science Center, All tags...
Hazard Maps,
NEHRP,
National Earthquake Hazard Reduction Program,
National Seismic Hazard Maps,
Seismic Hazard Maps,
USGS,
USGS Science Data Catalog (SDC),
United States,
Vs30,
building codes,
earthquake ground motions,
earthquake probability,
geophysics,
insurance rate structures,
probabilistic hazard maps,
public policy,
risk assessments,
seismic hazard,
seismic hazard curves,
seismic provisions,
spectral accelerations,
tectonic, Fewer tags
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Wildfire can significantly alter the hydrologic response of a watershed to the extent that even modest rainstorms can produce dangerous flash floods and debris flows. The USGS conducts post-fire debris-flow hazard assessments for select fires in the Western U.S. We use geospatial data related to basin morphometry, burn severity, soil properties, and rainfall characteristics to estimate the probability and volume of debris flows that may occur in response to a design storm.
Types: Citation;
Tags: GHSC,
Geologic Hazards Science Center,
LHP,
Landslide Hazards Program,
USGS, All tags...
USGS Science Data Catalog (SDC),
United States,
debris flow,
flash floods,
hazard assessments,
hydrologic response,
landslide hazard,
wildfire, Fewer tags
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Subduction zones are home to the most seismically active faults on the planet. The shallow megathrust interface of subduction zones host our largest earthquakes, and are the only faults capable of M9+ ruptures. Despite these facts, our knowledge of subduction zone geometry - which likely plays a key role in determining the spatial extent and ultimately the size of subduction zone earthquakes - is incomplete. Here we calculate the three- dimensional geometries of all active global subduction zones. The resulting model - Slab2 - provides for the first time a comprehensive geometrical analysis of all known slabs in unprecedented detail.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: EHP,
Earth,
Earthquake Hazards Program,
GHSC,
Geologic Hazards Science Center, All tags...
USGS,
earth science,
earthquake hazard,
large earthquake ruptures,
shallow megathrust interface,
subduction zone,
subduction zone geometry model, Fewer tags
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This dataset represents 25 parallel longitudinal profiles that were extracted from terrestrial lidar point clouds taken during six survey periods. The six lidar surveys were conducted between 7 October 2010 and 8 October 2013. Over that time a colluvial hollow eroded into a fluvial channel. The longitudinal profiles show the topography of the colluvial hollow for each survey period. The width of the original colluvial hollow was approximately 1.25 m, and a longitudinal profile was extracted every 5 cm for the entire length of the hollow, resulting in 25 parallel longitudinal profiles. These data can be used to observe the transition of the colluvial hollow to a fluvial channel and furthermore they show the development...
Types: Citation;
Tags: Fourmile Canyon, Colorado,
GHSC,
Geologic Hazards Science Center,
LHP,
LIDAR, All tags...
Landslide Hazards Program,
Soil Sciences,
USGS,
USGS Science Data Catalog (SDC),
burned watershed,
colluvial hollow,
earth science,
fluvial channel,
landslide hazard,
soil erosion,
wildfire,
wildfire hazard, Fewer tags
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ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes. These maps are used by federal, state, and local organizations, both public and private, for post-earthquake response and recovery, public and scientific information, as well as for preparedness exercises and disaster planning.
Types: Citation;
Tags: ANSS,
Advanced National Seismic System,
ComCat,
Comprehensive Earthquake Catalog,
Earth, All tags...
Earthquake Hazards Program,
GHSC,
Geologic Hazards Science Center,
ShakeMap,
USGS,
disaster planning,
earth science,
earthquake hazard,
geophysics,
ground motion,
post-earthquake recovery,
post-earthquake response,
preparedness exercises,
real time monitoring,
regional earthquake,
regional seismic networks,
seismic hazard,
seismology,
shaking intensity,
tectonophysics, Fewer tags
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