Field Mapping At Long Valley Caldera Geothermal Area (Sorey & Farrar, 1998)
Exploration Activity: Field Mapping At Long Valley Caldera Geothermal Area (Sorey & Farrar, 1998)
|Exploration Activity Details|
|Location||Long Valley Caldera Geothermal Area|
|Exploration Technique||Field Mapping|
|Activity Date||1985 - 1997|
Abstract: "Since 1985, Long Valley caldera in east central California has been the site of a 40 MW binary electric geothermal development utilizing water at temperatures near 170°C. During the course of this development, changes have occurred in surficial features, including declines in hot spring discharge, increase in fumarolic discharge, heat induced vegetation kills, and land subsidence. Factors responsible for such changes include seismic activity and related ground deformation, seasonal and annual variations in recharge, and changes in geothermal reservoir pressures and temperatures. To date, however, there have been no significant adverse impacts to thermal springs whose usage is important for recreational and economic reasons. A program do hydrologic monitoring has been in effect since 1988 under the direction of the Long Valley Hydrologic Advisory Committee. The monitoring data have provided useful information on the hydrothermal system and its response to development that can be used by regulatory agencies in designating permit conditions and mitigation measures for existing and future resource developments."
- Michael L. Sorey, Christopher D. Farrar (1998) Changes in Surficial Features Associated with Geothermal Development in Long Valley Caldera, California, 1985-1997