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0.2-second spectral response acceleration (5% of critical damping) with a 2% 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 of hazard curves for a grid of points with a spacing of 0.1 degrees in latitude and longitude. This particular data set is for horizontal spectral response acceleration for 0.2-second period with a 2 percent probability of exceedance in 50 years. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags 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 grid of points with a spacing of 0.1 degrees in latitude and longitude. It represents the annual rate of exceedance versus 0.2-second spectral response acceleration. Types: Citation; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags Hazard curve data for the 2018 one-year seismic hazard forecast from induced and natural earthquakes using the full seismicity catalog and a b-value of 1.5 These data sets represents the hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. They represents the annual rate of exceedance versus peak horizontal acceleration or horizontal spectral response acceleration for 0.2- or 1.0-second periods. These hazard curves are based on the full seismicity catalog and a calculated b-value of 1.5. Peak ground acceleration with a 2% 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 of hazard curves for a grid of points with a spacing of 0.1 degrees in latitude and longitude. This particular data set is for peak ground acceleration with a 2 percent probability of exceedance in 50 years. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags Subduction model The subduction model accounts for large earthquakes (M 7–9.5) that occur on the subduction interface. The subduction zones along the northern and western coast of South America, the Panama deformation zones, and the Lesser Antilles subduction zone of the Caribbean are considered in the subduction model of this hazard assessment. The subduction interface of the Nazca plate beneath the western coast of South America has been separated into five zones, down to a depth of 50 km. The five zones are based on the locations of impinging subduction ridges, dimensions of large earthquakes, and fault complications. An alternative model for Chile (Medina et al., 2017) is applied to the Nazca subduction zones 3–5. This... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile 6) Seismic design maps and data for South America Based on the USGS probabilistic seismic hazard model for South America, earthquake ground motion "design" maps were prepared, using the same procedures used to prepare seismic design maps for the U.S. and its territorries. The design maps for the U.S. and its territories have been adopted by U.S. building codes and consist of two parts: 1) Risk-targeted maximum considered earthquake (MCER) spectral acceleration maps at periods of 0.2 and 1.0 seconds, and 2) maximum considered earthquake geometric mean (MCEG) PGA maps. Both types of maps are derived in accordance with the site_specific ground motion procedures of the NEHRP Recommended Seismic Provisions for New Buildings and Other Structures (BSSC, 2015) and... 2b. Catalog of natural earthquakes without duplicates for the central and eastern U.S. Because of their transitory nature, induced earthquakes are excluded from seismic hazard models that are used for building codes, but they are used in special studies. Induced events are identified based on information in the literature, local expertise, and scrutiny of local catalogs. In this processing step, catalog emm.c2 is divided into two parts: a sub-catalog of suspected induced earthquakes (“pi”), and a complementary sub-catalog of natural earthquakes (“pn”). The catalog of natural earthquakes is included here. 2b. Earthquake catalog without duplicates for the western U.S., for use outside the UCERF3 zone (Catalog B) In processing step 2, duplicate entries, explosions, and mining-related seismic events are deleted from wmm_wg.c1 and wmm_rw.c1. Duplicates are identified within time and distance windows, and a preference hierarchy is used to select a favorite. Non-tectonic catalogs in the literature and online event-by-type catalog searches are used to identify explosions and mining-related events. Two distinct WUS catalogs are produced in step 2 to facilitate integrating California seismicity with the rest of the WUS. The Uniform California Earthquake Rupture Forecast (UCERF3) project developed a catalog for a region extending about 100km beyond the California border. Catalog B is constructed for the whole western U.S. with... Seismicity catalog used in the 2018 one-year seismic hazard forecast for the Central and Eastern United States from induced and natural earthquakes 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.S. (CEUS), and some have caused damage. In response, the USGS is now also making short-term forecasts that account for the hazard from these induced earthquakes. A uniform earthquake catalog is assembled by combining and winnowing pre-existing source catalogs. Seismicity statistics are analyzed to develop recurrence models,... Tags: Alabama, Arizona, Arkansas, Colorado, Connecticut, All tags... Delaware, District of Columbia, Earthquake, Florida, Georgia, Hazard, Illinois, Indiana, Induced, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Natural, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, Seismic, South Carolina, South Dakota, Tennessee, Texas, USA, United States, Utah, Vermont, Virginia, West Virginia, Wisconsin, Wyoming, Fewer tags Modeled and observed magnitude-frequency distribution, Oklahoma-Kansas potential induced earthquake catalog, 2016-2017 The b-value for the earthquake catalog from the Oklahoma-Kansas potentially induced earthquake zone is computed with the maximum likelihood method (MLE) (Aki, 1965). We use the minimum magnitude of completeness that is used for the seismicity rate models (Mc=2.7) and the earthquakes from 2016 and 2017 and find b=1.5 (1.48+/-0.05). However, we find that the b-value from the full (non-declustered) catalog is sensitive to the minimum magnitude of completeness, perhaps due to the moment magnitudes at these values being highly dependent on the conversion relations and the measurements of local magnitudes. Aki, K. (1965). Maximum likelihood estimate of b in the formula log N= a-bM and its confidence limits. Bull. Earthq.... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile 2a. Catalog of induced earthquakes without duplicates for the central and eastern U.S. Because of their transitory nature, induced earthquakes are excluded from seismic hazard models that are used for building codes, but they are used in special studies. Induced events are identified based on information in the literature, local expertise, and scrutiny of local catalogs. In this processing step, catalog emm.c2 is divided into two parts: a sub-catalog of suspected induced earthquakes (“pi”), and a complementary sub-catalog of natural earthquakes (“pn”). The catalog of induced earthquakes without duplicates is included here. Risk-targeted maximum considered earthquake ground motion of 0.2-second spectral response acceleration (5% of critical damping) Risk-targeted maximum considered earthquake ground acceleration maps (MCER) are for the design of buildings and other structures. The maps are derived from the USGS seismic hazard maps in accordance with the site-specific ground-motion procedures of the NEHRP Recommended Seismic Provisions for New Building and Other Structures and the ASCE Minimum Design Loads for Buildings and Other Structures (also known as the ASCE 7 Standard; ASCE, 2016). The MCER ground motions are taken as the lesser of probabilistic and deterministic values, as explained in the Provisions. The gridded probabilistic and deterministic values for 0.2-second spectral response acceleration are available here. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags 1.0-second spectral response acceleration (5% of critical damping) with a 50% 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 of hazard curves for a grid of points with a spacing of 0.1 degrees in latitude and longitude. This particular data set is for horizontal spectral response acceleration for 1.0-second period with a 50 percent probability of exceedance in 50 years. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags Hazard curve data for the 2017 one-year seismic hazard forecast from induced and natural earthquakes using the full seismicity catalog and a b-value of 1.5 These data sets represents the hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. They represents the annual rate of exceedance versus peak horizontal acceleration or horizontal spectral response acceleration for 0.2- or 1.0-second periods. These hazard curves are based on the full seismicity catalog and a calculated b-value of 1.5. Chance of moderate (MMI ≥ VII) damaging earthquake shaking in 100 years This maps portrays the spatial potential for damaging earthquake ground shaking quantified as moderate (MMI ≥ VII) 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 technique (Allen and Wald, 2009) and site amplification based on the relationships of Seyhan and Stewart (2014). MMI ≥ VII is equivalent to peak ground acceleration of 0.22g and 1.0-second horizontal spectral acceleration of 0.23g (Worden et al., 2012). Allen, T.A. and Wald, D.J. 2009,. On the use of high-resolution topographic... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Argentina, Bolivia, Brazil, Chile, Colombia, All tags... Earthquake, Ecuador, French Guiana, Guyana, Hazard, Panama, Paraguay, Peru, Risk, Seismic, South America, Suriname, Trinidad and Tobago, Uruguay, Venezuela, Fewer tags Hazard curve data for annual rate of exceedance versus 1.0-second spectral response acceleration This data set represents the hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. It represents the annual rate of exceedance versus 1.0-second spectral response acceleration. Earthquake catalog (1568 to 2018) for the USGS National Seismic Hazard Model and Nuclear Regulatory Commission The earthquake catalog was generated in August 2018 using the standard National Seismic Hazard Model methodology (Mueller, 2019) for the central and eastern United States. Pre-existing catalogs were merged, duplicate records were removed, the catalog was declustered, and induced earthquakes were removed. The final catalog contains 6802 records, M2.5–7.8, and extends from 1568 through July 2018. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Seismology, USGS Science Data Catalog (SDC), United States, catalog, earthquake occurrences, All tags... earthquakes, geoscientificInformation, hazard, location, seismology, Fewer tags Smoothed seismicity model The smoothed seismicity model is based on a uniform seismicity catalog that is used to assess the location and rate of future earthquakes. This catalog is declustered by removing foreshocks and aftershocks so that only independent events are considered, as required in the probabilistic probabilistic methodolgy used to assess seismic hazard. Future seismicity rates are estimated by counting historical earthquakes in a grid with a cell dimension of 0.1 degrees in latitude and longitude. These gridded earthquake rates are smoothed using a 50 kilometer fixed length smoothing kernel. Separate rate models were developed for the craton and active tectonic regions for earthquake depths between 0 and 50 km. Gridded... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile 1) Source models for South America The 2017 USGS South American seismic hazard model is based on: a uniform seismicity catalog, a smoothed (gridded) seismicity model, a subduction model, crustal fault model, and ground motion models that are described below. These models are combined to account for ground shaking from earthquakes on known faults as well as earthquakes on faults not included in the model. Chance of potentially minor-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 Central and Eastern United States 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 = VI. The values are obtained by averaging the probability of experiencing MMI = VI based on a peak ground acceleration value of 0.1155 g for site class D, and the probability of experiencing MMI = VI based on 1.0-second spectral acceleration value of 0.102 g for site class D. The data are for the Central and Eastern United States. 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