California (Long Valley) USGS Temperature Depth Well Logs

Basic Information
Author: Farrar, Christopher; DeAngelo, Jacob; Williams, Colin; Grubb, Frederick; and Hurwitz, Shaul
Description:This compilation is metadata for a collection of 163 Long Valley Caldera geothermal well field temperature-depth logs from 80 wells compiled by the U.S. Geological Survey. The Long Valley Caldera in eastern California has been the site of extensive research on geothermal resources and volcanic hazards. The first geothermal exploratory drilling was done in the shallow, less than 200 m deep, hydrothermal system at Casa Diablo in the 1960s. Many more boreholes were drilled throughout the caldera in the 1970s and 1980s by private industry for geothermal exploration and by the USGS and Sandia National Laboratory for volcanic and geothermal research and exploration. Temperature logs were obtained in some of these wells during or immediately following drilling, before thermal equilibration was complete. Most of the temperature logs, however, were obtained weeks, months, or years after well completion and are representative of dynamic thermal equilibrium. The Excel workbooks and CSV files include temperatures at discreet depths and graphic profiles of data. The data are courtesy of the USGS. For more information on this resource, please see the links provided.
Publication Date:
Author Contact Information
Distributor Contact Information
Name: Farrar, Christopher; DeAngelo, Jacob; Williams, Colin; Grubb, Frederick; and Hurwitz, Shaul
Organization Name: U.S. Geological Survey
Street: 5229 N Lake Blvd
City: Carnelian Bay
State: CA
Zip: 96140
Phone: 530-546-0187
Geographic Extent
North Bounding Latitude: 38.39343832
South Bounding Latitude: 37.5228976725
East Bounding Longitude: -118.378379404
West Bounding Longitude: -119.339683115