Digital map showing faults, lineaments, and earthquake epicenters in the Pahute Mesa 30' x 60' quadrangle, Nevada, in Arc/Info ASCII generate and Arc/Info export formats

Details and significance of fault, lineament, and seismicity data used in the current compilation are described in following sections. Each type of data was digitized differently: (1) most fault data were imported from previous 1:100,000-scale digital geologic compilations covering the Pahute Mesa quadrangle (Minor and others, 1993; Sawyer and others, 1995); (2) a few supplemental (newly acquired) fault lines were hand digitized within the GIS program indicated below; (3) selected lineaments originally mapped by Reheis (1992) were hand digitized using GSMAP (Selner and Taylor, 1993); and (4) seismicity data point coordinates were read directly from ASCII tables modified from reported seismicity catalogs (Meremonte and Rogers, 1987; D. Vonseggern, Univ. of Nevada, Reno, digital commun., 1995). A non-edited digital base map of the Pahute Mesa 30’ x 60 quadrangle, which is included with the data files, was obtained by scanning and vectorizing a stable-base copy of the published U.S. Geological Survey 1:100,000-scale base map. Geographic Resource Analysis Support System (GRASS), a public domain GIS developed by the U.S. Army Corps of Engineers, was used to transform all new component data to Universal Transverse Mercator projections, merge data in the appropriate map layers, hand digitize supplemental line data, conduct final editing and modification of map elements, and assign attributes to map line elements. Finally, GRASS was used to convert the data layers to ARC/INFO ASCII and export files.