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Alska is a complex amalgamation of tectonic blocks with diverse histories. Sedimentary basins that are formed on these blocks both before amalgamation and as a result of collisions between them record the tectonic history of this complex region. Thermal-maturity data-indicators of maximum burial temperatures-provide important constraints both on basin evolution and on terrane amalgamation. To help elucidate these relations, and to provide constraints for hydrocarbon assessments, the U.S. Geological survey (USGS) has compilied thermal-maturity data from Alaska for many decades. This report is a digital release of our current understanding of thermal-maturity patters in Alaska.
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This digital map database, which is compiled from previouslyunpublished and open-filed U.S. Geol. Survey reports (Wesling andHelley, 1989), represents the general distribution and identity ofQuaternary deposits in eight 7.5 minute quadrangles in the southernSan Francisco Bay region, California.
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These maps show, for emergency service managers in the San FranciscoBay region, the threshold rainfall that may be capable oftriggering a level of debris-flow activity likely to threatenpublic safety. The maps are products of a continuing series ofstudies that began after a catastrophic storm on January 3-5, 1982triggered 18,000 debris flows in the San Francisco Bay region,causing 25 deaths and $66 million in property damage. Thethreshold rainfall values were estimated by re-evaluating aprevious empirical analysis of data from the 1982 storm, and otherhistorical rainfall records, that normalized the rainfall intensitydata by dividing by the mean annual precipitation (MAP) of thecorresponding rain gage. The present...
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The Santa Ana Quadrangle is in the northern part of the Peninsular Ranges Province as defined by Jahns (1954), except for the northeast corner, which is underlain by basement rocks of the Transverse Ranges Province. A summary of the general geology of the Peninsular Ranges Province is given by Jahns (1954) and a generalized geologic map of this part of the Peninsular Ranges Province is given by Rogers (1965). This report provides a digital representation of this quadrangle.
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This map identifies the principal areas in the San Francisco Bayregion that are likely to produce debris flows, which are alsocalled "mudslides." Debris flows that occur in the bay region arefast-moving downslope flows of mud that may include rocks,vegetation, and other debris. These flows begin during intenserainfall as shallow landslides on steep slopes. The rapid movementand sudden arrival of debris flows pose a hazard to life andproperty during and immediately following the triggering rainfall.Debris flows in a given storm originate from a number of sourcesscattered throughout steep parts of the landscape, as shown infigure 1 (on map sheet; files sfbr- df.ps, al-df.ps, etc.). Duringsubsequent storms, new debris...
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Contra Costa County is located at the northern end of the DiabloRange of Central California. It is bounded on the north byCarquinez Strait, through which flows 27 percent of California'ssurface water runoff. San Francisco Bay forms the westernboundary, the San Joaquin Valley borders it on the east and theLivermore Valley forms the southern boundary. Contra Costa is oneof the nine Bay Area counties with streams that are tributaries toSan Francisco Bay. Most of the county is mountainous with steeprugged topography. Mount Diablo, in the center of the county, isone of the highest peaks in the Bay Area, reaching an elevation of1173 meters (3,849 ft). Contra Costa County is covered bytwenty-five 7.5' topographic Quadrangles...
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The Santa Ana Quadrangle is in the northern part of the Peninsular Ranges Province as defined by Jahns (1954), except for the northeast corner, which is underlain by basement rocks of the Transverse Ranges Province. A summary of the general geology of the Peninsular Ranges Province is given by Jahns (1954) and a generalized geologic map of this part of the Peninsular Ranges Province is given by Rogers (1965). This report provides a digital representation of this quadrangle.
The ssfb_m1 digital map database, which is compiled from 1970'svintage sources, represents the general distribution and identityof geologic materials in the southern San Francisco Bay region,California, west of the Calaveras fault. It is not a geologic map,because it does not address the geologic structure or thestratigraphic organization of the map units in a systematic way.Instead, it is directed at the distribution and character of thegeologic materials following the pattern of its progenitors,Wentworth and others (1985) and Ellen and Wentworth (in press).Consultation of these reports and the other compilation sources willaid in using the database.
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This digital map database represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text files (hpk_geo.txt, hpk_geo.pdf or hpk_geo.ps), it provides current information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller.
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The bedrock geology of the 7.5-minute Windham quadrangle, New Hampshireconsists of deformed early Paleozoic crystalline metamorphic and intrusiveigneous rocks intruded by Mesozoic igneous dikes.The geologic data was mapped during the summer of 1998 at a scale of1:24,000. The bedrock geology was mapped using standard techniques.Locational information was provided by Rockwell PLGR+96 GPS receiversusing the federal precise positioning service.The line and polygon data were compiled on a mylar greenline of the7.5-minute quadrangle and scanned at 400 dpi on an Anatech Eagle 4080Tscanner. The raster files (TIF) were converted to vector files (DXF)using GTX OSR version 2.0 raster-to-vector conversion software. Thevector...
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This geologic map database is a bedrock compilation of the Beatty30'x 60' quadrangle in southern Nevada and adjoining parts ofCalifornia. The database represents a new compilation at1:100,000-scale of the southern part of the southwestern Nevadavolcanic field and Paleozoic and late Precambrian sedimentary rocksin Bare Mountain and the Funeral Mountains. The map area includesthe entire region around Yucca Mountain, the proposed nationalhigh-level nuclear waste repository, and the eastern part of DeathValley National Park. A major epithermal disseminated gold depositis being mined at Ladd Mountain, in the southeastern BullfrogHills, and the geology of numerous other areas of mineralization inthe Bullfrog Hills and...
A table keyed to 171 topographic quadrangles on a new1:275,000-scale shaded-relief map speeds access to information onlandslide locations in the ten-county San Francisco Bay region.Detailed maps showing individual landslides in nearly any area ofinterest can be found quickly by knowing only the name of theappropriate 7.5' quadrangle. The some-80 technical reports thatcontain these maps may be consulted in the U.S. Geological Survey'sMenlo Park library collection.
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Alameda County is located at the northern end of the Diablo Range ofCentral California. It is bounded on the north by the south flankof Mount Diablo, one of the highest peaks in the Bay Area, reachingan elevation of 1173 meters (3,849 ft). San Francisco Bay forms thewestern boundary, the San Joaquin Valley borders it on the east andan arbitrary line from the Bay into the Diablo Range forms thesouthern boundary. Alameda is one of the nine Bay Area countiestributary to San Francisco Bay. Most of the country is mountainouswith steep rugged topography. Alameda County is covered bytwenty-eight 7.5' topographic Quadrangles which are shown on theindex map (alq_quad or Sheet 2).The Quaternary deposits in Alameda County...
The distribution of landslides evident in the landscape -- most ofwhich are slumps, translational slides, and earth flows -- is ofinterest both for evaluation of hazard and risk and for use infurther study of landslides. Future movement of such landslides ismost likely to occur within and around the places where they havepreviously occurred. A map showing the generalized distribution ofthese landslides was published by Nilsen and Wright for the 9-countySan Francisco Bay region in 1979. Original sources available at thetime of that compilation were incomplete for the region. Landslidemapping that has since become available provides a basis forrevision and extension of that work, and modern procedures allowthis to...
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Alameda County is located at the northern end of the Diablo Range of Central California. It is bounded on the north by the south flank of Mount Diablo, one of the highest peaks in the Bay Area, reaching an elevation of 1173 meters (3,849 ft). San Francisco Bay forms the western boundary, the San Joaquin Valley borders it on the east and an arbitrary line from the Bay into the Diablo Range forms the southern boundary. Alameda is one of the nine Bay Area counties tributary to San Francisco Bay. Most of the country is mountainous with steep rugged topography. Alameda County is covered by twenty-eight 7.5' topographic Quadrangles which are shown on the index map (alq_quad or Sheet 2). The Quaternary deposits in Alameda...
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This Open-File report is a digital geologic map database stored in acomputer in the U. S. Geological Survey offices in Menlo Park,California. The study area includes the Monterey Peninsula and partof the Carmel Valley area. Geologically, this region is situatedwithin the complexly deformed Salinian block between the active SanAndreas fault to the northeast and the San Gregorio fault zone tothe southwest. It also is characterized by compressional tectonicsrelated to the San Andreas fault system and includes many poorlyunderstood subsidiary faults (Greene and others, 1988). A seriesof high-angle faults trends northwestward across the quadrangles.Most of the faults in the area are discontinuous, with some lessthan...
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This Open-File report is a digital geologic map database. Thisdigital map database is prepared from a previously published map byBrabb (1989). The geologic map database delineates map units thatare identified by general age, lithology and clast size followingthe stratigraphic nomenclature of the U. S. Geological Survey.
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Some of the benefits that can be derived from these geologic maps are:>1. Materials properties>2. Earthquake shaking>3. Liquefaction potential>4. Ground water pollution>5. Relating landslides>6. Location of mineral hazards>7. Seismic velocity>8. Earthquake faults>9. Education and scientific inquiry
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This two coverage dataset makes up a 1:25,000 scalesurficial geologic map along the Castle Mountain faultbetween Houston and Hatcher Pass Road in southcentralAlaska. The map area lies entirely within the Anchoragequadrangle and within the Matanuska-Susitna Borough. Theprimary purpose of the map is to delineate the locationof the Castle Mountain fault and other active orpotentially active faults in the area. This map liesbetween two other maps along the Castle Mountain faultby Detterman and others (1974, 1976).
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This digital geologic map database represents the distribution and character of Cenozoic geologic strata in six 15' quadrangles covering most of the Tillamook Highlands in the northwest Oregon Coast Range. The geologic map was published as Open-File Report 94-21, the Geologic Map of the Tillamook Highlands, Northwest Oregon Coast Range, by Wells and others.


map background search result map search result map Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin Counties, California: A digital database Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, Southern California, version 1.0 Generalized Thermal Maturity Map of Alaska Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: A digital database Digital Bedrock Geologic Map Database of the Beatty 30 X 60-Minute Quadrangle, Nevada and California Geologic Map of the Monterey and Seaside 7.5-minute Quadrangles, Monterey County, California: A Digital Database Geologic map of Santa Cruz county, California: A digital database Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin Counties, California: A digital database Quaternary geology of Contra Costa County, and surrounding parts of Alameda, Marin, Sonoma, Solano, Sacramento, and San Joaquin Counties, California: A digital database Geology of the Palo Alto 30 X 60 minute quadrangle, California: A digital database Surficial geologic map along the Castle Mountain faultbetween Houston and Hatcher Pass Road, Alaska Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, Southern California, version 1.0 Geologic Map of the Hart Peak Quadrangle, California and Nevada: A Digital Database Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: General description Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: General description Geologic Map of the Hart Peak Quadrangle, California and Nevada: A Digital Database Surficial geologic map along the Castle Mountain faultbetween Houston and Hatcher Pass Road, Alaska Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: A digital database Geologic map of Santa Cruz county, California: A digital database Geology of the Palo Alto 30 X 60 minute quadrangle, California: A digital database Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, Southern California, version 1.0 Digital Bedrock Geologic Map Database of the Beatty 30 X 60-Minute Quadrangle, Nevada and California Quaternary geology of Contra Costa County, and surrounding parts of Alameda, Marin, Sonoma, Solano, Sacramento, and San Joaquin Counties, California: A digital database Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, Southern California, version 1.0 Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin Counties, California: A digital database Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin Counties, California: A digital database Generalized Thermal Maturity Map of Alaska