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This data set contains locations and information on faults and associated folds in the United States that are believed to be sources of M>6 earthquakes during the Quaternary (the past 1,600,000 years). On the website, maps of these geologic structures are linked to a database containing detailed descriptions and references. The database is intended to be the USGS?s archive for historic and ancient earthquake sources used in current and future probabilistic seismic-hazard analyses. Our website presents for the first time a single source that summarizes important information on paleoseismic (ancient earthquake) parameters. These data are compiled from thousands of journal articles, maps, theses, and other documents,...
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This report presents a preliminary map and database ofQuaternary deposits and liquefaction susceptibility for thenine-county San Francisco Bay region, together with a digitalcompendium of ground effects associated with past earthquakesin the region. The report consists of (1) a spatial database offivedata layers (Quaternary deposits, quadrangle index, andthree ground effects layers) and two text layers (a labels andleaders layer for Quaternary deposits and for groundeffects), (2) two small-scale colored maps (Quaternary depositsand liquefaction susceptibility), (3) a text describing theQuaternary map, liquefaction interpretation, and the groundeffects compendium, and (4) the databse description pamphlet.The nine...
This digital map database consists of the ESRI ARC/INFO Version7.0.2 coverages used to generate the plates in Professional Paper1538-M (1994). Base-data is from 1:2,000,000-scale Digital LineGraph (DLG) data (roads, railroads, streams, water bodies, andinternational boundaries) and 1:100,000 scale DLG data (state andcounty boundaries).


    map background search result map search result map Preliminary maps of Quaternary deposits and liquefactionsusceptibility, nine-county San Francisco Bay region,California: a digital database Quaternary Faults Preliminary maps of Quaternary deposits and liquefactionsusceptibility, nine-county San Francisco Bay region,California: a digital database Quaternary Faults