Geological survey usgs nati onal seismic hazard model, which uses a uniform firmrocksite condition, the new probabilistic seismichazard estimates document much more variability. National seismic hazard mapping project has built a good scientific database. National seismic hazard mapsdocumentation june 1996. The usgs and its partners monitor and report earthquakes, assess earthquake impacts and hazards. He serves as a liaison between the usgs national seismic hazard mapping project and the american society of civil engineers asce seismic subcommittees for the asce 7 and 41 standards, among other building code committees. Then the usgs calculates gridded values of seismic design parameters based on usgs hazard values in accordance with design code procedures. Sitespecific seismichazard maps and deaggregation in. Also, generalized fault data used in the hazard maps. The values returned by the two applications are not identical. During 20172018, the national seismic hazard model for the conterminous united states was updated as follows. Caltrans reliance on usgs national seismic hazard mapping program. Geological survey usgs nati onal seismic hazard model. Broad and shallow, used to help people find scientific information.
The global seismic hazard map is a product of the global seismic hazard. The design code developers first decide how usgs earthquake hazard information should be applied in design practice. The 2018 update of the us national seismic hazard model. The map is based on the most recent usgs models for the conterminous u. Seismic hazard is the hazard associated with potential earthquakes in a particular area, and a seismic hazard map shows the relative hazards in different areas. The global seismic hazard assessment program gshap was launched in 1992 by the international lithosphere program ilp with the support of the international council of scientific unions icsu, and endorsed as a demonstration program in the framework of the united nations international decade for natural disaster reduction unidndr. For parts of the us, the national seismic hazard mapping project in 2008 resulted in seismic hazard maps showing peak acceleration as a percentage of gravity with a 2% probability of exceedance in 50 years. Over the past four decades, the us national seismic hazard model nshm project of the us geological survey usgs. With each release or update of a national seismic hazard model nshm, a variety of earthquake catalogs are compiled and subsequently processed to remove duplicate, dependent foreshocks and aftershocks, and anthropogenic events. Vs30m can be directly used for shakemap products, hazusmh applications, seismic hazard mapping gmpes, and building code developments in the region. The usgs collaborates with organizations that develop building codes for buildings, bridges, and other structures to make seismic design parameter values available to engineers. Seismic design technology for new buildings the 2015 nehrp recommended seismic.
Maps of surficial geology, deterministic and probabilistic seismic hazard, and liquefaction potential index have been prepared by various members of the evansville area earthquake hazard mapping project for seven quadrangles in the evansville, indiana, and henderson, kentucky, metropolitan areas. Email california geological survey zones of required investigation for. Development of risk targeted earthquake ground motions for use in asce 7, n. The evansville area earthquake hazards mapping project eaehmp has produced three types of hazard maps for the evansville area. Usgs lowers seismic hazard forecast for oklahoma in 2017. The gshap global seismic hazard map the site classification is rock everywhere except canada and the united states, which assume rockfirm soil reference ground conditions. This appendix describes how to use the usgs design value utility, including five screenshots to illustrate. The hazard component of the current air earthquake model for the united states is based on. Topics and methods of scientific study carried out by usgs, with product types, scientific disciplines, geologic time, and types of institutional structure and activities.
By national geologic map database project and pacific northwest geologic mapping project u. Some seven million people in the central and eastern united states live or work in areas threatened by so called induced seismicity, and in parts of these regions, the damage caused by earthquakes could be at parity with that seen in high. Temblor, a company founded in 2014, offers a seismic hazard rank for the all of the conterminous us. The national seismic hazard model project team standing outside the geologic hazards science center building in golden, colorado. Probabilistic seismic hazard maps were prepared for alaska portraying peak horizontal ground acceleration and horizontal spectral. Nshmp models, codes and catalogs national seismic hazard. However, the hazard curves and maps produced are not scientifically sound because the methodology being used. Geological survey usgs national seismic hazard maps are an important part of that program. United states geological survey by including humaninduced events, our assessment of earthquake hazards has significantly increased in parts of the u.
Usgs uses github for all new software development, as well as open sourcing older. Mar 20, 2019 national seismic hazard mapping project nshmp earthquake catalogs. Our database will be the first database gathered for a seismic network supplying data for current and future studies at and nearby the stations, and future statewide highresolution site. He serves as a liaison between the usgs national seismic hazard mapping project.
The national archive of marine seismic surveys namss is a marine seismic reflection data archive consisting of data acquired by or contributed to u. Unified hazard tool replaces most of the previous individual tools. The 2008 national seismic hazard mapping project nshmp update for the conterminous united states employs several new groundmotion prediction equations which include modern empirical models of. Unified hazard tool usgs earthquake hazard program. The usgs is committed to preserving these data on behalf of the academic community and the nation. Unified hazard tool please do not use this tool to obtain ground motion parameter values for the design code reference documents covered by the u. Development of risktargeted earthquake ground motions for. The 2008 national seismic hazard mapping project nshmp update for the conterminous united states employs several new groundmotion prediction equations which include modern empirical models of linear and nonlinear site response to local and regional earthquakes. Seismichazard maps for alaska and the aleutian islands. Seismichazard maps for the conterminous united states. Alaska 2007, south east asia 2007, united states 2008, south america 2010 and more in. For parts of the us, the national seismic hazard mapping project in 2008 resulted in seismic hazard maps showing peak acceleration as a percentage of gravity with a 2% probability of exceedance in. Having issued national seismic hazard maps in 1996, the usgs updated them in 2002, 2008, and again in 2014.
These maps are intended to summarize the available quantitative information about seismic ground motion hazard for the conterminous united states from geologic and geophysical sources. Mar 31, 2017 mark petersen, chief of the usgs national seismic hazard mapping project, said the 2016 prediction for oklahoma was quite accurate in assessing hazardous areas and that the possibility of. The design code developers first decide how usgs earthquake hazard information. Research projects in the earthquake hazards program, external research support, science center activities, software. Geological survey ocean bottom seismometer facility the ocean bottom seismometer facility provides technical support for a variety of scientific investigations ranging from deep crustal structure. Nicolas luco is a research structural engineer with the u. Usgs provides update for the national seismic hazard model. Geological survey usgs workshop at our newark headquarters in california to discuss the interim updates planned for the 2018 usgs national seismic hazard map project nshmp. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site.
Caltrans division of research, innovation, and system information. Bulletin of the seismological society of america, v. The hazard component of the current air earthquake model for the united states is based on the most recentthe 2014 usgs national seismic hazard map project nshmp. Change is coming to usgs earthquake map air worldwide. This sort of analysis is the basis for the us national seismic hazard mapping project, and it is critical for making sure we build structures that can withstand earthquake shaking. National archive of marine seismic surveys home usgs. While the information presented on this website is believed to be correct, seaoc oshpd and its sponsors and contributors assume no responsibility or liability for its accuracy. Luco, usgs march 11, 2011 eeri seminar on next generation attenuation models calculated iteratively by combining.
Usgs thesaurus topics and methods of scientific study carried out by usgs, with product types, scientific disciplines, geologic time, and types of institutional structure and activities. Uniform california earthquake forecasts ucerfs timedependent earthquake probability maps for california from the working group on california earthquake probabilities. Please do not use this tool to obtain ground motion parameter values for the design code reference documents covered by the u. The usgs earthquake hazards program is part of the national earthquake hazards reduction program nehrp, established by congress in 1977, and the usgs advanced national seismic system anss was established by congress as a nehrp facility. The usgs collaborates with organizations such as the building seismic safety council that develop model building and bridge design codes to make seismic design parameter values available to. Usgs earthquake hazards program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards. Geological survey openfile report 96532, 110 p report hanks, t. Seismic design maps and tools for engineers usgs the. Quitorianos research works united states geological.
Caltrans reliance on usgs national seismic hazard mapping. Code issues 0 pull requests 0 actions projects 0 wiki security insights. Email california geological survey zones of required investigation for earthquakeinduced landslides livermore valley, california. National seismic hazard mapping project nshmp code. Code issues 0 pull requests 0 actions projects 0 wiki. Evansville area earthquake hazards mapping project usgs. Seismic hazard maps for alaska and the aleutian islands. Geological survey national seismic hazard maps rock. Mark petersen, chief of the usgs national seismic hazard mapping project, said the 2016 prediction for oklahoma was quite accurate in assessing hazardous areas and that the possibility of. Seaoc oshpd do not intend that the use of this information replace the sound judgment of such competent professionals, having experience and knowledge in the field of practice, nor to substitute for the standard of care required of such professionals in interpreting and applying the results of the seismic data provided by this website. The usgs national seismic hazard mapping project for making the following models publicly available. The global seismic hazard assessment program gshap was launched in 1992 by the international lithosphere program ilp with the support of the international council of scientific unions icsu, and. Opensha provides a platform that can accomodate both past and future models.
Having issued national seismic hazard maps in 1996, the usgs updated them in 2002, 2008, and. However, the hazard curves and maps produced are not scientifically sound because the methodology being used psha the math is simply incorrect not transparent difficult to understand and communicate. Evansville area earthquake hazards mapping project. Nshmp models, codes and catalogs national seismic hazard mapping project. Induced and tectonic earthquakes in the central and eastern united states february 2019 bulletin of the seismological. Usgs software tools for sitespecific ground motion hazard. Interactive fault map and comprehensive geologically based information on known or suspected active faults and folds in the united states. Usgs uses github for all new software development, as well as open sourcing older software as time allows. Using the usgs seismic hazards mapping utility seismic loads. The grid of points was contoured to produce the final representation of the seismic hazard. Maps of surficial geology, deterministic and probabilistic seismic hazard, and liquefaction potential index have been prepared by various members of the evansville area earthquake hazard mapping project. These maps are intended to summarize the available quantitative information about seismic ground motion hazard.
Geological survey and the swiss seismological service have released the first quantitative map of global seismic hazard. Hazard levels for upland sites consisting of bedrock and weath. We present here a number of comparisons between the hazard results e. Our goal is to provide a framework where any arbitrarily complex e.
Earthquake hazards are an important consideration in planning efforts. As new earthquakes occur, the national seismic hazard model project team. Probabilistic seismic hazard maps were prepared for alaska portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0. Alaska 2007, south east asia 2007, united states 2008, south america 2010 and more in general for the openly sharing models and software. Jul 21, 2014 2014 usgs national seismic hazard map, displaying intensity of potential ground shaking from an earthquake in 50 years which is the typical lifetime of a building.
Software to download usgs earthquake hazard program. Geological survey s usgs national seismic hazard mapping project nshmp utilizes a database of over 500 faults across the conterminous united states to constrain earthquake source. See how our applications work and collaborate with us at usgs github. Geological survey usgs workshop at our newark headquarters in california to discuss the interim updates planned for the 2018 usgs national seismic. National seismic hazard mapping project nshmp earthquake catalogs.
Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in. Aug 21, 2019 nicolas luco is a research structural engineer with the u. Seismic design maps and tools for engineers usgs the best. Usgs releases earthquake hazard map geospatial solutions. To help make the best decisions to protect communities from earthquakes, new usgs maps display how intense ground shaking could be across the nation. Welcome to the data page of the geology discipline of the u. Some seven million people in the central and eastern united states live or work in areas. Nshmp hazard codes github repositorynshmp hazard model for conterminous u.
1001 824 876 264 12 282 1450 143 458 1555 1146 205 752 428 609 1477 914 753 130 1119 269 67 645 1119 1451 1308 121 1574 1101 962 1364 967 1655 1016 382 244 23 991 360 171