Earthquake Hazards

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Monitoring, station, and other various seismic data available for download. Data products to view and download.

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Filter Total Items: 233
Date published: April 24, 2019

Chance of considerable (MMI = VIII) damaging earthquake shaking in 100 years

This data set portrays the spatial potential for damaging earthquake ground shaking quantified as considerable (MMI = VI) in 100 years. The maps and data are based on the average of the results obtained from peak ground acceleration and 1.0-second horizontal spectral acceleration. Site specific soil factors based on Vs30 shear wave velocities were implemented using a simple topographic proxy...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Incorporating teleseismic tomography data into models of upper mantle slab geometry

Earthquake-based models of slab geometry are limited by the distribution of earthquakes within a subducting slab, which is often heterogeneous. The fast seismic velocity signature of slabs in tomography studies is independent of the distribution of earthquakes within the slab, providing a critical constraint on slab geometry when earthquakes are absent. In order to utilize this constraint,...

Attribution: Earthquake Hazards
Date published: April 24, 2019

1.0-second spectral response acceleration (5% of critical damping) with a 1% probability of exceedance in 1 year

A one-year seismic hazard forecast for the Central and Eastern United States, based on induced and natural earthquakes, has been produced by the U.S. Geological Survey. The model assumes that earthquake rates calculated from several different time windows will remain relatively stationary and can be used to forecast earthquake hazard and damage intensity for the year 2018. This assessment is...

Attribution: Earthquake Hazards
Date published: April 24, 2019

0.2-second spectral response acceleration (5% of critical damping) with a 1% probability of exceedance in 1 year

A one-year seismic hazard forecast for the Central and Eastern United States, based on induced and natural earthquakes, has been produced by the U.S. Geological Survey. The model assumes that earthquake rates calculated from several different time windows will remain relatively stationary and can be used to forecast earthquake hazard and damage intensity for the year 2018. This assessment is...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Chance of slight (MMI = VI) damaging earthquake shaking in 100 years

This data set portrays the spatial potential for damaging earthquake ground shaking quantified as slight (MMI = VI) in 100 years. The maps and data are based on the average of the results obtained from peak ground acceleration and 1.0-second horizontal spectral acceleration. Site specific soil factors based on Vs30 shear wave velocities were implemented using a simple topographic proxy...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Catalog of natural and induced earthquakes without duplicates

The U. S. Geological Survey (USGS) makes long-term seismic hazard forecasts that are used in building codes. The hazard models usually consider only natural seismicity; non-tectonic (man-made) earthquakes are excluded because they are transitory or too small. In the past decade, however, thousands of earthquakes related to underground fluid injection have occurred in the central and eastern U....

Attribution: Earthquake Hazards
Date published: April 24, 2019

KMZ file of summary field observations and photographs obtained during post-earthquake investigations of the Mw 6.0 South Napa Earthquake of August 24, 2014

This product presents summary information from field observations and photographs (data contained in the associated Observations.txt and Photos.txt data files) in KMZ format, allowing for: a) viewing the data in a spatial context within Google Earth or other earth viewers, b) easily accessing full-resolution photographs; and c) relating this information to mapped fault rupture and ground...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Modified Mercalli Intensity based on peak ground acceleration, with a 10% probability of exceedance in 50 years

A seismic hazard model for South America, based on a smoothed (gridded) seismicity model, a subduction model, a crustal fault model, and a ground motion model, has been produced by the U.S. Geological Survey. These models are combined to account for ground shaking from earthquakes on known faults as well as earthquakes on un-modeled faults. This data set represents the results of calculations...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Chance of potentially moderate-damage ground shaking in 2018 based on the average of horizontal spectral response acceleration for 1.0-second period and peak ground acceleration for the Western United States

A one-year seismic hazard forecast for the Central and Eastern United States, based on induced and natural earthquakes, has been produced by the U.S. Geological Survey. The model assumes that earthquake rates calculated from several different time windows will remain relatively stationary and can be used to forecast earthquake hazard and damage intensity for the year 2018. This assessment is...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Disaggregation plots

Disaggregation of the seismic hazard for peak ground acceleration having a 2 percent probability of exceedance in 50 years is given for several major cities in South America. These disaggregation plots and reports show the relative contribution of individual sources to the seismic hazard (aggregated by magnitude and distance).

Attribution: Earthquake Hazards
Date published: April 24, 2019

Risk-targeted maximum considered earthquake ground motion (MCER) of 0.2-second spectral response acceleration

A seismic hazard model for South America, based on a smoothed (gridded) seismicity model, a subduction model, a crustal fault model, and a ground motion model, has been produced by the U.S. Geological Survey. These models are combined to account for ground shaking from earthquakes on known faults as well as earthquakes on un-modeled faults. This data set represents the probabilistic and...

Attribution: Earthquake Hazards
Date published: April 24, 2019

Hazard curve data for annual rate of exceedance versus 0.2-second spectral response acceleration

A seismic hazard model for South America, based on a smoothed (gridded) seismicity model, a subduction model, a crustal fault model, and a ground motion model, has been produced by the U.S. Geological Survey. These models are combined to account for ground shaking from earthquakes on known faults as well as earthquakes on un-modeled faults. This data set represents the hazard curves for a...

Attribution: Earthquake Hazards