Assessment of geothermal resources of the United States: 1978

Circular 790
Prepared in cooperation with the Department of Energy



The geothermal resource assessment presented in this Circular is a refinement and updating of USGS Circular 726. Nonproprietary information available in June 1978 is used to assess geothermal energy in the ground and, when possible, to evaluate the fraction that might be recovered at the surface. Five categories of geothermal energy are discussed:

a. Conduction-dominated regimes

b. Igneous-related geothermal systems

c. High-temperature (>1500C) and intermediate-temperature (90°-150°C) hydrothermal convection systems

d. Low-temperature (<900C) geothermal waters

e. Geopressured-geothermal energy (both thermal energy and energy from dissolved methane).

Assessment data are presented on three colored maps prepared in cooperation with the National Oceanic and Atmospheric Administration.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Assessment of geothermal resources of the United States: 1978
Series title Circular
Series number 790
DOI 10.3133/cir790
Year Published 1979
Language English
Publisher U.S. Geological Survey
Description Report: iv, 163 p.; 3 Plates: 34.51 x 46.16 inches and smaller
Country United States
Google Analytic Metrics Metrics page
Additional publication details