Filters: Tags: San Francisco Bay Region (X)4 results (10ms)
This product was derived from a clipped portion of the ~3m spatial resolution National Elevation Dataset. The National Elevation Dataset (NED) is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. All NED data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). All elevation values are provided in units of meters, and are referenced...
Management units for Ellicott Slough NWR. These boundaries were updated as part of the Comprehensive Conservation Plan in 2009.
The data comprise an archive of repeated surveyed measurements to monitor surface fault creep (a form of gradual tectonic movement) occurring along active faults in the San Francisco Bay region for use by the scientific research community. Additional description of these data and the methods used to collect them is provided at: https://pubs.usgs.gov/of/2009/1119/ The primary data are angle measurements surveyed using an electronic theodolite on about ninety alignment arrays that cross the region's major faults, which enables detection of any significant rate changes over time from long-term rates of aseismic fault displacement. These primary measurement data, and resulting long-term average creep rates of each site,...
Preliminary maps of Quaternary deposits and liquefactionsusceptibility, nine-county San Francisco Bay region,California: a digital database
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...