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Multichannel sparker seismic reflection data of USGS field activity 2018-658-FA collected between Cape Blanco and Cape Mendocino from 2018-10-04 to 2018-10-18 Note: This data release has been superseded, available here: https://doi.org/10.5066/P9MYL7WJ This data release contains processed high-resolution multichannel sparker seismic-reflection (MCS) data that were collected aboard Humboldt State University’s R/V Coral Sea in October of 2018 on U.S. Geological Survey cruise 2018-658-FA on the shelf and slope between Cape Blanco, Oregon, and Cape Mendocino, California. MCS data were collected to characterize quaternary deformation and sediment dynamics along the southern Cascadia margin. Tags: Bathymetry and Elevation, Bear Valley, Blanco Fracture Zone, Blanco Saddle, CMHRP, All tags... Cape Blanco, City of Eureka, Coastal and Marine Hazards and Resources Program, Continental Margin, Crescent City, Eel Canyon, Eel River, Geophysics, Gorda Basin, Marine Geology, Mattole Canyon, Mendocino Escarpment, Mendocino Fracture Zone, Mendocino Ridge, PCMSC, Pacific Coastal and Marine Science Center, Pacific Ocean, Seismology, State of California, State of Oregon, Stratigraphy, Structural Geology, Trinidad Canyon, U.S. Geological Survey, USGS, geoscientificInformation, geospatial datasets, marine geophysics, oceans, seismic reflection profiling, sparker, sub-bottom profiling, Fewer tags Chirp, multichannel minisparker, and boomer seismic-reflection data from USGS field activity G-01-13-GA collected in Port Valdez, Alaska, in September 2013 Multichannel minisparker and boomer seismic-reflection and chirp sub bottom data were collected by the U.S. Geological Survey in September of 2013 in Port Valdez, Alaska. Data were collected aboard the USGS R/V Alaskan Gyre during field activity G-01-13-GA. Sub-bottom acoustic penetration spans several hundreds of meters and is variable by location. High-resolution multichannel seismic-reflection data were acquired to support the U.S. Geological Survey Alaska coastal and marine hazards project to explore the sedimentary structure of tsunamigenic landslide deposits around an IODP drill site in Port Valdez. These data and information are intended for science researchers, students from elementary through college, policy... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Seismology, Structural Geology Bathymetry, acoustic backscatter, and minisparker seismic-reflection datasets collected southwest of Montague Island and southwest of Chenega, Alaska during field activity 2014-622-FA High-resolution acoustic backscatter data, bathymetry data, single channel minisparker seismic-reflection data were collected by the U.S. Geological Survey (USGS) and the Alaska Department of Fish and Game in May of 2014 southwest of Chenega Island and southwest of Montague Island, Alaska. Data were collected aboard the Alaska Department of Fish and Game vessel, R/V Solstice, during USGS field activity 2014-622-FA, using a pole mounted 100-kHz Reson 7111 multibeam echosounder, a 500 Joule SIG 2-mille minisparker sound source and a single channel streamer. Categories: Data; Tags: Geomorphology, Geophysics, Marine Geology, Seismology, Structural Geology Data release for the lower seismogenic depth model of western U.S. earthquakes A model of the lower seismogenic depth distribution of earthquakes in the western United States was developed to support models for seismic hazard assessment that will be included in the 2023 USGS National Seismic Hazard Model. This data release presents a recalibration using the hypocentral depths of events M>1 from the Advanced National Seismic System Comprehensive Earthquake Catalog from 1980 to 2021. For higher precision and better resolution in the model, the data were supplemented with seismicity from southern California that was relocated by Hauksson and others (2012). Along the San Andreas Fault, the deepest seismogenic depths are located at 23 km around the Cholame segment, whereas the shallowest depths... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Geophysics, Seismology, USGS Science Data Catalog (SDC), United States, earthquake occurrences, All tags... earthquakes, hazards, seismology, Fewer tags Atlantic and Gulf Coastal Plains Sediment Thickness (v220517) This dataset of the elevation of basement and thickness of sediment above the syn- and post-rift unconformity (sediments above being generally Late Cretaceous and younger) was constructed for application to site response models in earthquake hazard analyses. Sediment thickness in meters is provided in zipped csv format on a 0.01-degree grid, and sediment thickness and basement elevation in meters relative to mean sea level are provided in GeoTIFF format on a 1-km grid. Tags: EHP, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, Geophysics, All tags... Seismology, Structural Geology, USGS, USGS Science Data Catalog (SDC), United States, earthquake occurrences, earthquakes, geoscientificInformation, hazards, maps and atlases, sediment thickness, Fewer tags Updated Compilation of VS30 Data for the United States VS30, the time-averaged shear-wave velocity (VS) to a depth of 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions. VS30 is typically based on geophysical measurements of VS derived from invasive and noninvasive techniques at sites of interest. Owing to cost considerations, as well as logistical and environmental concerns, VS30 data are sparse or not readily available for most areas. Where data are available, VS30 values are often assembled in assorted formats that are accessible from disparate and (or) impermanent Websites. To help remedy this situation, we compiled VS30 measurements obtained by studies funded by the U.S. Geological Survey (USGS) and... Categories: Data; Tags: Geophysics, Seismology, USGS Science Data Catalog (SDC), United States, earthquake seismology, All tags... seismic hazard maps, seismic monitoring stations, seismic profiles, Fewer tags Data Release for the 2014 National Seismic Hazard Model for the Conterminous U.S. 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 Data Release for the 2002 National Seismic Hazard Model for the Conterminous U.S. 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 Data Release for the 1999 Alaska Seismic Hazard Model 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 Open-File Report 99-36 (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 Science Data Catalog submission - USGS:aedffa40-95a3-4b8d-a947-cab0b7c05fff Supplemental Material: Distinct yet adjacent earthquake sequences near the Mendocino Triple Junction: 20 December 2021 Mw 6.1 and 6.0 Petrolia, and 20 December 2022 Mw 6.4 Ferndale Data Sets S0-S4 with station data and earthquake catalogs in text format See README_Data_Supplement.pdf for more details Tags: Mendocino, Northern California Coastal, USGS Science Data Catalog (SDC), USGS:aedffa40-95a3-4b8d-a947-cab0b7c05fff, biota, All tags... earthquake occurrences, earthquakes, seismology, Fewer tags Multichannel minisparker and chirp seismic reflection data of USGS field activity 2016-616-FA collected in the Catalina Basin offshore southern California in February 2016 This data release contains 25 multichannel minisparker seismic reflection (MCS) profiles and 41 chirp sub-bottom profiles that were collected in February of 2016 from the Catalina Basin offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center in cooperation with the University of Washington. Data were collected aboard the University of Washington’s R/V Thomas G. Thompson on USGS cruise 2016-616-FA. MCS profiles were collected to image the Catalina and San Clemente fault systems as well as the San Gabriel Canyon and Channel system. Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Marine Geology, Seismology, Structural Geology Multichannel minisparker, multichannel boomer, and chirp seismic-reflection data of USGS field activity 2017-612-FA collected in Puget Sound and Lake Washington in February of 2017 High-resolution multichannel minisparker, multichannel boomer and chirp seismic-reflection data were collected by the U.S. Geological Survey and the University of Washington in February of 2017 west of Seattle in Puget Sound and in Lake Washington, Washington. Data were collected aboard University of Washington’s R/V Clifford A. Barnes during USGS field activity 2017-612-FA. Sub-bottom acoustic penetration spans several hundreds of meters and is variable by location. Data were collected to characterize recent deformation and estimate earthquake recurrence on the Seattle Fault zone. These data and information are intended for science researchers, students from elementary through college, policy makers, and general... Tags: Geophysics, Marine Geology, Seismology Multibeam bathymetry, acoustic backscatter, and multichannel minisparker seismic-reflection data of USGS field activity 2016-666-FA collected in the Santa Barbara Basin in September and October of 2016 High-resolution multichannel minkisparker seismic-reflection (MCS) profiles were collected by the U.S. Geological Survey in September and October of 2016 from the northern portion of the Santa Barbara Basin offshore southern California. Data were collected aboard the USGS R/V Parke Snavely and NOAA R/V Shearwater during field activity 2016-666-FA. Data were acquired to support USGS geologic hazards projects to aide hazard assessment within the Santa Barbara Basin. High-resolution multichannel minisparker seismic-reflection, multibeam-bathymetry and acoustic-backscatter data were collected to investigate the causes and consequences of submarine landslides in the Santa Barbara Basin. These data and information are... Tags: Geophysics, Marine Geology, Sedimentology, Seismology, Stratigraphy, All tags... Structural Geology, Fewer tags Data Release for the 2018 Update of the U.S. National Seismic Hazard Model: Where, Why, and How Much Probabilistic Ground Motion Maps Changed This dataset presents where, why, and how much probabilistic ground motions have changed with the 2018 update of the National Seismic Hazard Model (NSHM) for the conterminous U.S. (CONUS) vs. the 2014 NSHM. In the central and eastern U.S., hazard changes are the result of updated ground motion models (further broken down by median and epistemic uncertainty, aleatory variability, and site effects models) and gridded seismicity models. In the western U.S., hazard changes are the result of updated ground motion models in four urban areas with deep sedimentary basins and gridded seismicity models. Probabilistic ground motion changes (2% in 50 years probability of exceedance for a firm rock site, VS30 = 760 m/s, NEHRP... Categories: Data; 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), ground motion, hazard curve, hazard map, spectral period, Fewer tags Data Release for PGV Data for the 2018 National Seismic Hazard Model for the Conterminous United States Peak ground velocity (PGV) gridded probabilistic seismic hazard data for the updated 2018 National Seismic Hazard Model (NSHM) for the Conterminous United States (CONUS). PGV hazard curves and ground motions have been calculated on a 0.05 by 0.05 degree grid using the NSHM CONUS 2018 earthquake source model. PGV support has been incorporated into the NSHM using a newly developed PGV model conditioned on pseudo-spectral acceleration (Abrahamson and Bhasin, 2020, PEER Report No. 2020/05). See Powers et al. (in press) for implementation details. This dataset complements the "Data Release for Additional Period and Site Class Data for the 2018 National Seismic Hazard Model for the Conterminous United States (ver. 1.2,... Tags: CONUS, CONUS, Conterminous U.S., Conterminous U.S., EHP, All tags... Earthquake Hazards Program, GHSC, 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 Data Release for the 2010 Haiti Seismic Hazard Model Gridded seismic hazard curve data, gridded ground motion data, and mapped gridded ground motion values are available for the 2010 Haiti Seismic Hazard Model. Probabilistic seismic hazard data and maps are available for peak ground acceleration (PGA) and 0.2, and 1.0 second spectral acceleration at probability levels of 2 percent in 50 years and 10 percent in 50 years, assuming firm rock soil conditions at 760 m/s. Development of the 2010 Haiti Seismic Hazard Model is documented at https://pubs.usgs.gov/of/2010/1067/ and https://doi.org/10.1193/1.3631016. This dataset is considered a legacy dataset. The original dataset was uploaded to the USGS website at the time of publication of the seismic hazard model (2010)... Tags: EHP, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, Geophysics, All tags... Haiti, Haiti, NEHRP site classes, NSHM, NSHMP, National Seismic Hazard Model, National Seismic Hazard Model Project, Seismology, U.S. Seismic Hazard Maps, USAID, USGS, USGS Science Data Catalog (SDC), ground motion, hazard curve, hazard map, spectral period, Fewer tags Earthquake Relocations for the 2008 Wells, Nevada Earthquake Sequence The 2008 Wells, Nevada Earthquake Sequence: Source Constraints using Calibrated Multiple Event Relocation and InSAR Categories: Data; Tags: Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, Geophysics, InSAR, All tags... Seismology, USGS, USGS Science Data Catalog (SDC), United States, Wells, Nevada, calibrated multiple event relocation, earthquake, earthquake hazard, earthquake relocation, geophysics, seismic hazard, seismology, source constraints, tectonic, Fewer tags High-resolution seismic data acquired at six Southern California Seismic Network (SCSN) recording stations in 2017 In August 2017, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data near six Southern California Seismic Network (SCSN) recording stations in southern California: CI.OLI Olinda; CI.SRN Serrano; CI.MUR Murrieta; CI.LCG La Cienega; CI.RUS Rush; and CI.STC Santa Clara (Figure 1). These strong-motion recording stations are located inside Southern California Edison electrical substations, critical infrastructures that provide essential services to millions of customers. The primary goals of the seismic survey were to understand the potential for amplified ground shaking and to evaluate lateral variability in shear-wave velocity at these sites. We deployed up to 88 geophones at 2-m or 4-m... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Seismology, Shear-wave velocity, Southern California, USGS Science Data Catalog (SDC), All tags... earthquake hazards, ground motion, seismic refraction methods, seismology, shaking, site characterization, surface wave method, Fewer tags Data Release for Additional Period and Site Class Maps for the 2014 National Seismic Hazard Model for the Conterminous United States The 2014 update of the U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for the conterminous United States (2014 NSHM; Petersen and others, 2014; https://pubs.usgs.gov/of/2008/1128/) included probabilistic ground motion maps for 2 percent and 10 percent probabilities of exceedance in 50 years, derived from seismic hazard curves for peak ground acceleration (PGA) and 0.2 and 1.0 second spectral accelerations (SAs) with 5 percent damping for the National Earthquake Hazards Reduction Program (NEHRP) site class boundary B/C (time-averaged shear wave velocity in the upper 30 meters [VS30]=760 meters per second [m/s]). This data release provides 0.1 degree by 0.1 degree gridded seismic hazard curves,... Categories: Data Release - Revised; 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), ground motion, hazard curve, hazard map, spectral period, Fewer tags Field evidence noted in 2008 to 2023 that pertains to sea floods of the past millennium on Anegada, British Virgin Islands This release provides inventories of georeferenced evidence pertaining to extreme waves on Anegada, a low Caribbean island perched south of the Puerto Rico Trench: CORAL BOULDERS AND COBBLES -- Derived offshore, found inland. Boulder star coral Orbicella franksii (37 localities), brain coral Pseudodiploria strigosa (171), elkhorn coral Acropora palmata (36), mustard hill coral Porites astreoides (29). LIMESTONE BOULDERS AND COBBLES -- Derived and found onshore (633). MOLLUSCAN SHELLS -- Queen conch Aliger gigas, discarded by precolonial fishers (12 onshore heaps) and by modern fishers (40 offshore heaps); individual conch shells deposited inland by precolonial sea flood (59); tiger lucine Codakia orbicularis, also... Tags: British Virgin Islands, Caribbean Sea, Geography, Geomorphology, Geophysics, All tags... Marine Geology, Sedimentology, Seismology, Stratigraphy, USGS Science Data Catalog (SDC), Water Resources, biota, carbon-14 analysis, corals, geoscientificInformation, hurricanes, tsunamis, Fewer tags 1 2 3 »