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The original time series and cross power data were stored in Binary format on 3.5" disks until further conversion was needed. To convert the time series and cross power data to a format that can be used for modeling, the original binary files were converted to ASCII format using Basic 4.0 code and associated subroutines (see Magnetotelluric_Original-Code_Binary-to-Ascii.txt and Magnetotelluric_Original-Code_Binary-to-Ascii-Subroutines.txt attached to the binary data ScienceBase item). The DaR project used these converted ASCII format files to create the EDI format files included in this data release. The binary data are considered the original data for the magnetotelluric survey, therefore, they are provided with...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered...
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This data set maps and describes the geology of the Devore 7.5' quadrangle, SanBernardino County, California. Created using Environmental Systems Research Institute'sARC/INFO software, the data base consists of the following items: (1) a map coveragecontaining geologic contacts and units, (2) attribute tables for geologic units(polygons), contacts (arcs), and site-specific data (points). In addition, the dataset includes the following graphic and text products: (1) A PostScript graphicplot-file containing the geologic map, topography, cultural data, a Correlation of MapUnits (CMU) diagram, a Description of Map Units (DMU), an index map, a regionalgeologic and structure map, and a key for point and line symbols;...
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This digital map database, compiled from previously published andunpublished data, and new mapping by the authors, represents thegeneral distribution of bedrock and surficial deposits in the mappedarea. Together with the accompanying text file (pamf.ps, pamf.pdf,pamf.txt), it provides current information on the geologic structureand stratigraphy of the area covered. The database delineates mapunits that are identified by general age and lithology following thestratigraphic nomenclature of the U.S. Geological Survey. The scaleof the source maps limits the spatial resolution (scale) of thedatabase to 1:62,500 or smaller.
Tags: 06081 = San Mateo, 06085 = Santa Clara, 06087 = Santa Cruz, 1100 - Geology, 1101 - General, All tags...
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This data set maps and describes the geology of the San Bernardino North 7.5' quadrangle,San Bernardino County, California. Created using Environmental Systems ResearchInstitute's ARC/INFO software, the data base consists of the following items: (1) a mapcoverage containing geologic contacts and units, (2) attribute tables for geologic units(polygons), contacts (arcs), and site-specific data (points). In addition, the data setincludes the following graphic and text products: (1) A PostScript graphic plot-filecontaining the geologic map, topography, cultural data, a Correlation of Map Units (CMU)diagram, a Description of Map Units (DMU), an index map, a regional geologic andstructure map, and a key for point and...
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This digital map database, compiled from previously published andunpublished data, and new mapping by the authors, represents thegeneral distribution of bedrock and surficial deposits in themapped area. Together with the accompanying text file (ceghmf.ps,ceghmf.pdf, ceghmf.txt), it provides current information on thegeologic structure and stratigraphy of the area covered. Thedatabase delineates map units that are identified by general ageand lithology following the stratigraphic nomenclature of the U.S.Geological Survey. The scale of the source maps limits the spatialresolution (scale) of the database to 1:100,000 or smaller.
Tags: 06023 = Humboldt, 06045 = Mendocino, 06103 = Tehama, 06105 = Trinity, Bear River fault zone, All tags...
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This digital map database, compiled from previously publishedand unpublished data, and new mapping by the authors,represents the general distribution of bedrock and surficialdeposits in the mapped area. Together with the accompanyingtext file (scvmf.ps, scvmf.pdf, scvmf.txt), it provides currentinformation on the geologic structure and stratigraphy of thearea covered. The database delineates map units that areidentified by general age and lithology following thestratigraphic nomenclature of the U.S. Geological Survey. Thescale of the source maps limits the spatial resolution (scale)of the database to 1:24,000 or smaller.
Tags: 06085 = Santa Clara, 06087 = Santa Cruz, Aldercroft fault, Ben Lomond fault block, Berrocal fault, All tags...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered...
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The Sawmill Mountain quadrangle is located in the western Transverse Ranges of California, about 10 km west of Frazier Park. It includes Mt. Pinos, Mt. Abel (Cerro Noroeste), a part of the southern San Emigdio Mountains, and straddles an eleven-kilometer reach of the nearly east-west striking "Big Bend" section of the San Andreas Fault.South of the San Andreas Fault, the oldest rocks include undated amphibolite-grade biotite and hornblende-biotite gneiss that is probably early or middle Proterozoic in age. The older gneiss is intruded by strongly deformed and foliated biotite orthogneiss that has an age on biotite of 67.2+0.5 Ma (Late Cretaceous). Several other weakly foliated to massive Late Cretaceous granitic...
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The Santa Clara River Lakes, located along the San Andreas fault 19 miles northwest of Palmdale, California, were placed on the state’s “303(d) List” or “Impaired Water List” in 1996 for eutrophic conditions, high pH, and low dissolved oxygen. In 2016, the state adopted a Total Maximum Daily Load (TMDL) for nutrients (nitrogen and phosphorus) in the Santa Clara River Lakes. This study focuses on the largest of the three lakes, Lake Elizabeth, which is surrounded by the unincorporated town of Elizabeth Lake, CA. The local community uses on-site wastewater treatment systems instead of a centralized sewer system, resulting in potential contamination of groundwater. In response to concerns over the quality of water...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered...
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These data provide measures of aseismic slip (creep) at approximately 40 sites located on the San Andreas, Hayward, and Calaveras faults in Central California from Point Pinole located in the San Francisco Bay area to south of Parkfield, California. The earliest measurement of creep followed the 1966 Parkfield earthquake. Currently, we maintain approximately 20 creepmeters and those data are uploaded to the web daily. The data provided at http://earthquake.usgs.gov/monitoring/deformation/data/download/table.php include measurements for sites that have been abandoned. The table provides the location of each creepmeter, and where present, notes that might be relevant to interpreting the data from each instrument.
Many plate boundary faults, including the San Andreas Fault, appear to slip at unexpectedly low shear stress. One long-standing explanation for a “weak” San Andreas Fault is that fluid release by dehydration reactions during regional metamorphism generates elevated fluid pressures that are localized within the fault, reducing the effective normal stress. We evaluate this hypothesis by calculating realistic fluid production rates for the San Andreas Fault system, and incorporating them into 2-D fluid flow models. Our results show that for a wide range of permeability distributions, fluid sources from crustal dehydration are too small and short-lived to generate, sustain, or localize fluid pressures in the fault sufficient...
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The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Data at Risk (DaR) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Parkfield, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered and transformed to binary or ASCII...
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The Yucaipa 7.5' quadrangle is located at the southeastern margin of the SanBernardino Basin, an extensional region situated within a right-step-over zonebetween the San Jacinto and San Andreas Fault zones. The quadrangle is traversed byseveral faults of the San Andreas system, including (from oldest to youngest) theBanning Fault and the Wilson Creek, Mission Creek, Mill Creek, and San BernardinoStrands of the San Andreas Fault.The Mill Creek Strand of the San Andreas Fault is the easternmost strand of the SanAndreas in the Yucaipa quadrangle. It separates granitic and metamorphic rocks ofthe San Bernardino Mountains block from a thin slice of similar rocks on YucaipaRidge, and thus has only a small amount of strike-slip...


map background search result map search result map ShakeOut 2008 CA M7.8 ShakeOut 2008 CA Aftershock 4 M6.0 ShakeOut 2008 CA M7.8 real-time stations Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California Geologic map of the Cape Mendocino, Eureka, Garberville,and southwestern part of the Hayfork 30 X 60 Quadrangles and Adjacent OffshoreArea, Northern California Geologic maps and structure sections of the southwestern SantaClara Valley and southern Santa Cruz Mountains, Santa Clara andSanta Cruz Counties, California Geologic Map of the San Bernardino North 7.5' quadrangle, San Bernardino County, California Geologic Map of the Devore 7.5' quadrangle, San Bernardino County, California Geologic map of the Sawmill Mountain quadrangle, Kern and Ventura Counties, California Geologic map and digital database of the Yucaipa 7.5' quadrangle, San Bernardino andRiverside Counties, California High resolution measurements of aseismic slip (creep) on the San Andreas fault system from Parkfield to San Francisco Bay area; 1966 to the present Magnetotelluric Data from the San Andreas Fault, Parkfield CA, 1990 Magnetotelluric Data from the San Andreas Fault, Parkfield CA, 1990: Binary Data Electrical Resistivity Tomography Data at Elizabeth Lake, Los Angeles County, California, 2019 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt04 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt05 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt03 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt01 Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt02 Electrical Resistivity Tomography Data at Elizabeth Lake, Los Angeles County, California, 2019 Geologic map of the Sawmill Mountain quadrangle, Kern and Ventura Counties, California Geologic map and digital database of the Yucaipa 7.5' quadrangle, San Bernardino andRiverside Counties, California Geologic Map of the San Bernardino North 7.5' quadrangle, San Bernardino County, California Geologic Map of the Devore 7.5' quadrangle, San Bernardino County, California Magnetotelluric Data from the San Andreas Fault, Parkfield CA, 1990 Magnetotelluric Data from the San Andreas Fault, Parkfield CA, 1990: Binary Data Geologic maps and structure sections of the southwestern SantaClara Valley and southern Santa Cruz Mountains, Santa Clara andSanta Cruz Counties, California Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California Geologic map of the Cape Mendocino, Eureka, Garberville,and southwestern part of the Hayfork 30 X 60 Quadrangles and Adjacent OffshoreArea, Northern California High resolution measurements of aseismic slip (creep) on the San Andreas fault system from Parkfield to San Francisco Bay area; 1966 to the present