Airborne-temperature-survey maps of heat-flow anomalies for exploration geology

Conference · Wed Nov 10 00:00:00 EST 1982

OSTI ID:6673368

Del Grande, N K

Precise airborne temperature surveys depicted small predawn surface temperature differences related to heat flow anomalies at the Long Valley, California, KGRA. Zones with conductive heat flow differences of 45 +- 16 ..mu..cal/cm/sup 2/(s) has predawn surface temperature differences of 1.4 +- 0.3/sup 0/C. The warmer zones had hot water circulating in a shallow (less than 60-m-deep) aquifer. Hot water is a useful geochemical indicator of geothermal and mineral resource potential. The precise airborne temperature survey method recorded redundant infrared scanner signals at two wavelengths (10 to 12 ..mu..m and 4.5 to 5.5 ..mu..m) and two elevations (0.3 km and 1.2 km). Ground thermistor probes recorded air and soil temperatures during the survey overflights. Radiometric temperatures were corrected for air-path and reflected-sky-radiation effects. Corrected temperatures were displayed in image form with color-coded maps which depicted 0.24/sup 0/C temperature differences. After accounting for surficial features on the corrected predawn thermal imagery, there remained several anomalous zones. These zones had high temperature gradients at depths from 6 to 30 m, compared to the temperature gradients in nearby areas.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6673368
• Report Number(s): UCRL-87802-Rev.1; CONF-821204-1-Rev.1; ON: DE83003018
• Resource Relation: Conference: International symposium on remote sensing of environment, Ft Worth, TX, USA, 6 Dec 1982; Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
LONG VALLEY
AERIAL SURVEYING
HEAT FLOW
TEMPERATURE SURVEYS
MAPS
THERMISTORS
CALIFORNIA
FEDERAL REGION IX
GEOPHYSICAL SURVEYS
NORTH AMERICA
SEMICONDUCTOR DEVICES
SURVEYS
USA
Geothermal Legacy
150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys