Filters: Tags: faulting (geologic) (X) > partyWithName: Joanne H Chan (X)

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2015 high resolution seismic acquisition at Dos Palmas Preserve, Mecca, California In March 2015, the U.S. Geological Survey acquired seismic reflection and refraction data along an approximately 2.8-km-long profile across northwest-trending San Andreas Fault splays located at the Dos Palmas Preserve east of Salton Sea. To acquire the reflection and refraction data, we collocated shots and geophones, spaced every 3 m along the profile. We used 933 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 925 P-wave shots. We generated P-wave data using one of two active sources: 400-grain Betsy-SeisgunTM shots at approximately every 90 m and a 3.5-kg sledgehammer and steel plate combination at every 3 m between the seisgun shots. All data... Categories: Data; Tags: Dos Palmas Spring, Geophysics, Mecca, Salton Sea, Seismology, All tags... Structural Geology, USGS Science Data Catalog (SDC), Water Resources, earthquake hazards, faulting (geologic), groundwater, groundwater flow, seismic reflection methods, seismic refraction methods, seismology, Fewer tags Data Release for the 2016 East Bay Seismic Imaging Investigation of the Hayward Fault Zone In October 2016, we acquired an approximately 15-km-long seismic profile along a linear transect across the East Bay region of the San Francisco Bay area. Our goal was to image previously unknown strands of the Hayward Fault zone and to better delineate the structure and geometry of the main trace of the Hayward Fault. Our profile started near the southern border of San Leandro, California at the San Francisco Bay shoreline, trended ENE through the northern edge of Castro Valley, California, and ended approximately 5 km WSW of San Ramon, California. The data were analyzed using refraction tomography modeling, reflection processing, and guided-wave analysis. The analyzed data are presented in separate reports by... Categories: Data; Tags: Geophysics, Hayward, San Francisco Bay Area, Seismology, USGS Science Data Catalog (SDC), All tags... earthquakes, faulting (geologic), hazards, seismic methods, seismic reflection methods, seismic refraction methods, seismology, Fewer tags 2017 seismic imaging of the West Napa Fault Zone, St. Helena, California In April 2017, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data across the suspected trace of the West Napa Fault zone in St. Helena, California. We acquired seismic reflection, refraction, and guided-wave data along a 215-m-long profile across the expected trend of the West Napa Fault zone. To acquire the reflection and refraction data, we co-located shots and geophones, spaced every 2 m along the profile. We used 109 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 108 P-wave shots, and 109 SercelTM L28-LBH S-wave (4.5-Hz horizontal-component) geophones with a sensitivity of 31.3 volts/meter/second to record 108 S-wave... Categories: Data; Tags: Geophysics, Saint Helena, Seismology, USGS Science Data Catalog (SDC), earthquakes, All tags... faulting (geologic), hazards, seismic reflection methods, seismic refraction methods, seismology, Fewer tags Data Release for the 2018 U.S. Geological Survey–California Geological Survey Fault-Imaging Surveys Across the Hollywood and Santa Monica Faults, Los Angeles County, California We acquired multiple types of controlled-source seismic data across the Hollywood Fault in Hollywood, Calif., and the Santa Monica Fault in Beverly Hills, Calif., in May and June of 2018. We acquired two separate profiles across the Hollywood Fault, and from those data, we can evaluate multiple seismic datasets, including guided-wave data, tomographic Vp data, and tomographic Vs data. From the datasets, we can calculate multiple seismic models, including Vp/Vs and Poisson's ratio models derived from tomographic Vp and Vs data, Rayleigh-wave-based Vs models, Love-wave-based Vs models, Vp/Vs and Poisson's ratio models (derived from combinations of tomographic-based Vp and surface-wave-based Vs models), P-wave reflection... Categories: Data; Tags: Beverly Hills, Hollywood, Seismology, USGS Science Data Catalog (SDC), earthquakes, All tags... faulting (geologic), hazards, seismic methods, seismic refraction methods, seismology, Fewer tags Three-component nodal recordings of aftershocks from the 15 May 2020 Mw 6.5 Monte Cristo, Nevada earthquake In May of 2020, the U.S. Geological Survey responded to the M6.5 Monte Cristo Range Earthquake, occurring near Tonopah, Nevada: https://www.usgs.gov/news/featured-story/m65-monte-cristo-range-earthquake. 60 DTCC SmartSolo 3-component nodal seismograph systems ("nodes") were deployed in the area and continuously recorded seismic data for about a month. Nodes were deployed in various arrays including a square grid, circular grid, linear array, and near 2 permanent strong-motion instruments. This report provides the metadata needed to analyze the seismic data. Categories: Data; Tags: Nevada, Seismology, USGS Science Data Catalog (SDC), earthquakes, faulting (geologic), All tags... hazards, seismic methods, seismic reflection methods, seismic refraction methods, seismology, Fewer tags High-resolution seismic data from the Frijoles Fault of the San Gregorio Fault zone, Año Nuevo, California The U.S. Geological Survey acquired high-resolution P- and S-wave seismic data across the Frijoles Fault strand of the San Gregorio Fault Zone (SGFZ) at Año Nuevo, California in 2012. The SGFZ is a Holocene-active, dominantly right-lateral fault system that trends more than 200 km along the California coastline. The Frijoles Fault is one of several onshore strands of the SGF system, and together the strands represent a 3- to 4-km wide fault zone at Año Nuevo. Prior paleoseismology studies indicate highly variable slip-rate estimates, indicating considerable uncertainty about the slip history of the SGFZ and the seismic hazard it poses. Amongst the onshore strands of the SGFZ at Año Nuevo, the Frijoles Fault presented... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Ano Nuevo, Geophysics, Northern California Coastal, San Mateo, Seismology, All tags... Structural Geology, USGS Science Data Catalog (SDC), earthquake occurrences, earthquake zone, earthquakes, fault zones, faulting (geologic), geoscientificInformation, hazards, seismic reflection profiling, seismic refraction profiling, seismology, Fewer tags 2017 U.S. Geological Survey/BC Hydro seismic data recorded at three dam sites on Vancouver Island, British Columbia, Canada In May 2017, we acquired high-resolution seismic profiles near three dam sites (Strathcona, Laodre and John Hart dams) located on Vancouver Island, British Columbia, Canada. Our goal was to measure seismic velocities (particularly Vs) at each dam site using body and surface waves. The data were analyzed using refraction tomography and multi-channel analysis of surface waves (MASW), especially in the upper 30 m of the subsurface. The analyzed data are presented in a separate report (Catchings and others, in review). We also recorded one hour of ambient noise (passive-source) data along most of the same profiles. This work was completed under the authority of a 2011 agreement relating to scientific and technical... Categories: Data; Tags: British Columbia, Seismology, USGS Science Data Catalog (SDC), Vancouver Island, earthquakes, All tags... faulting (geologic), hazards, seismic reflection methods, seismology, Fewer tags High-resolution seismic imaging of the West Napa Fault Zone at Saintsbury Winery, Napa, California In November 2016, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data across the surface trace of the West Napa Fault zone at Saintsbury Winery in Napa, California. We acquired seismic reflection, refraction, and guided-wave data along a 115-m-long profile across the known surface rupture zone of the West Napa Fault zone. To acquire the reflection and refraction data, we co-located shots and geophones, spaced every meter along the profile. We used 116 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 116 P-wave shots. We also used 116 SercelTM L28-LBH S-wave (4.5-Hz horizontal-component) geophones with a sensitivity of... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Earthquake Hazards, Earthquakes, Faulting (geologic), Geophysics, Napa, All tags... Northern California, Seismology, Seismology, USGS Science Data Catalog (SDC), West Napa Fault Zone, seismic reflection and refraction, Fewer tags High-resolution seismic imaging data acquired in 2021 across the West Winters Fault, Great Valley Fault System at Bigelow Hills, Yolo County, California In June of 2021, the U.S. Geological Survey conducted a high-resolution seismic survey at Winters, California. Seismic data were acquired using a DTCC SmartSolo 3-component nodal seismograph system ("node"), which continuously recorded at 2000 samples per second. Nodes were deployed 5 meters apart from west-southwest to east-northeast to create an approximately 800-m-long linear profile. P-wave data were generated primarily using a 500-lb (227-kg) accelerated weight drop at each recording station. In areas of difficult access, P-wave data were generated using a sledgehammer striking a steel plate. S-wave data were generated using a sledgehammer horizontally striking an aluminum block anchored to the ground. Every... Categories: Data; Tags: Seismology, USGS Science Data Catalog (SDC), Winters, earthquakes, faulting (geologic), All tags... hazards, seismic methods, seismic reflection methods, seismic refraction methods, seismology, Fewer tags Data Release for a 2020 High-Resolution Seismic Survey across Northeastern Edwards Air Force Base, Kern County, California In June of 2020, the U.S. Geological Survey conducted a high-resolution seismic survey at Edwards Air Force Base in Kern County, California. Seismic data were acquired using a DTCC SmartSolo 3-component nodal seismometer system ("node"), which continuously recorded at 2000 samples per second. Nodes were deployed 5 meters apart along a southwest-northeast trend to create an approximately 3-km-long linear profile. P-wave data were generated primarily using a 500-lb (227-kg) accelerated weight drop at each recording station. P-wave data were also generated at every 40 stations using downhole explosions, and fault-zone-guided-wave data were generated using explosive sources that were placed within a mapped trace of... Categories: Data; Tags: Kern County, Seismology, USGS Science Data Catalog (SDC), earthquakes, faulting (geologic), All tags... hazards, seismic methods, seismic reflection methods, seismic refraction methods, seismology, Fewer tags High-resolution seismic imaging data acquired in 2021 across a trace of the San Andreas Fault at Mee Ranch, Monterey County, California In April of 2021, the U.S. Geological Survey conducted a high-resolution seismic survey at Mee Ranch in Monterey County, California. Both passive- and active-source seismic data were acquired using DTCC SmartSolo 3-component nodal seismograph systems ("nodes"), which continuously recorded data at rates up to 2000 samples per second. For passive-source acquisition, a 6x5 grid of nodes was deployed for several weeks before and during the active source shooting. For active-source acquisition, 395 nodes were deployed 1 meter apart (2 meters apart near the endpoints) along a southwest-northeast trend to create an approximately 500-m-long linear array. Additional nodes were deployed at 1 or 2 meter spacing along 25- and... Categories: Data; Tags: Kern County, Seismology, USGS Science Data Catalog (SDC), earthquakes, faulting (geologic), All tags... hazards, seismic methods, seismic reflection methods, seismic refraction methods, seismology, Fewer tags 2017b high resolution seismic imaging of the West Napa Fault Zone, St. Helena, California In September 2017, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data across the suspected trace of the West Napa Fault zone in St. Helena, California, approximately 70 m north of the previous seismic survey conducted in April 2017 (Chan et al., 2018). We acquired seismic reflection, refraction, and guided-wave data along a 75-m-long profile across the expected trend of the West Napa Fault zone. To acquire the reflection and refraction data, we co-located shots and geophones, spaced every 1 and 2 m along the profile. We used 77 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 60 P-wave shots, and 77 SercelTM L28-LBH S-wave... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Northern California, Saint Helena, Seismology, USGS Science Data Catalog (SDC), All tags... earthquake hazards, earthquakes, faulting (geologic), seismic reflection methods, seismic refraction methods, seismology, Fewer tags Data Report for Nodal Seismograph Recording at the Byerly Seismographic Vault, University of California, Berkeley, California In September and October 2019, the USGS and UC Berkeley (UCB) deployed two nodal seismographs at the Byerly Seismographic Vault (station BRK), east of the UCB campus. One of the nodes was located immediately outside the vault, and the other was located within the vault, adjacent to a broadband seismometer. The objective of this deployment was to compare recordings of local earthquakes and ambient noise as recorded by very stable broadband recorders in the vault with nodes that were placed within and outside of the vault. The node within the vault was placed in a barrel filled with sand, and the node outside of the vault was placed a few inches below the surface. Both nodes recorded for approximately 28 days. Categories: Data; Tags: Alameda County, Geophysics, USGS Science Data Catalog (SDC), earthquakes, faulting (geologic), All tags... hazards, seismic methods, seismology, Fewer tags High-resolution seismic imaging of the West Napa Fault Zone at Buhman Avenue, Napa, California In November 2016, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data across the surface trace of the West Napa Fault zone near Buhman Avenue in Napa, California. We acquired seismic reflection, refraction, and guided-wave data along a 117-m-long profile across the known surface rupture zone of the West Napa Fault zone. To acquire the reflection and refraction data, we co-located shots and geophones, spaced every meter along the profile. We used 118 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 118 P-wave shots. We also used 118 SercelTM L28-LBH S-wave (4.5-Hz horizontal-component) geophones with a sensitivity of 31.3... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Earthquake Hazards, Earthquakes, Faulting (geologic), Geophysics, Napa, All tags... Northern California, Seismology, Seismology, USGS Science Data Catalog (SDC), West Napa Fault Zone, seismic reflection and refraction, Fewer tags