| Title | Airborne and Field Temperature Surveys Compared at Long Valley KGRA, California |
|---|---|
| Authors | Del Grande, N. Kerr |
| Year | 1981 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Exploration; USA; California; Long Valley; Aquifers; Hot Ground; Temperature; Thermal Anomaly |
| Abstract | An airborne predawn radiometric temperature survey was flown over the Long Valley KGRA. Radiometric temperatures were recorded at 1012 un and 4.5-5.5 ums. They were corrected to obtain true land surface temperatures in agreement with field data. After accounting for thermal effects from surface features, there remained a thermal anomaly. The anomalous zone encompassed 2km2. It was a dry land area with a predawn surface temperature which averaged 1.4+/-0.3°C warmer than ambient. This area coincided with a thermal discharge ozone where deep temperature gradients were 5-30 times normal. The predawn radiometric survey clarified and supplemented conclusions drawn from 6-30m deep field survey. Heat from hydrothermal discharge was stored in a shallow aquifer and conduct5ed to the surface. |