Proceedings of the 7th New Zealand Geothermal Workshop 1985. Long Valley, California : a caldera under stress. New Zealand Geothermal Workshop [7, 6-8 Nov. 1985, New Zealand].

Sorey, Michael L. Farrar, Christopher D.

1985

1067
CIENA

0-86869-065-1

Long Valley caldera in east-central California has been the site of intermittent volcanism up until as recently as 550-650 years ago, and since 1980 has experienced active seismicity and magmatic infaction. Such processes have caused changes in the caldera's hydrothermal system as has fluid production for geothermal energy development. A program of hydrologic and chemical monitoring by U.S. Geological Survey has been in effect since 1982 to detect and quantify changes in hot spring discharge, chemistry and isotopic content of springs and fumaroles, and temperature and pressure in wells. The results of this monitoring have lead to increased understanding of the hydrothermal system and the level of natural variability within the system, and documented decreases in hot spring flow at one site where fluid is produced for gethermal development. ABSTRACT. INTRODUCTION. THE HYDROTHERMAL SYSTEM. MONITORING PROGRAM. REFERENCES CITED.

Presenta grafs. y maps.

ESTADOS UNIDOS; CALDERAS; ENERGIA GEOTERMICA; GEOTERMIA; POZOS GEOTERMICOS; ANALISIS QUIMICO;