Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1985

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Report: Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1985

Abstract
Hydrologic and geochemical monitoring, by the U.S. Geological Survey, to detect changes caused by magmatic and tectonic processes in the Long Valley caldera has continued through 1985. The monitoring included the collection of the following types of data: chemical and isotopic composition of waters and gases from springs, wells, and steam vents; temperatures in wells, springs, and steam vents; flow rates of springs and streams; water levels in wells; and barometric pressure and precipitation at several sites. In addition, reservoir temperatures for the geothermal system were estimated from computations based on chemical geothermometers applied to fluid samples from wells and springs. Estimates of thermal water discharged from springs were made on the basis of boron and chloride fluxes in surface waters for selected sites in the Casa Diablo area and along the Mammoth-Hot Creek drainage. These data are presented in tables and graphs.The Long Valley area was relatively quiescent throughout 1985 in terms of geodetic changes and seismic activity. As a consequence, the hydrologic system varied mainly in response to seasonal influences of temperature, atmospheric pressure, and precipitation. However, spring flows near CasaDiablo were influenced by pumping at the geothermal production well field nearby.

Authors 
Christopher D. Farrar, Michael L. Sorey, S.A. Rojstaczer, Cathy J. Janik, T.L. Winnett and M.D. Clark








Published 
U.S. Geological Survey, 1987



Report Number 
Water-Resources Investigations Report 87-4090


DOI 
Not Provided
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Online 
Internet link for Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1985

Citation

Christopher D. Farrar,Michael L. Sorey,S.A. Rojstaczer,Cathy J. Janik,T.L. Winnett,M.D. Clark. 1987. Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1985. Sacramento, CA: U.S. Geological Survey. Report No.: Water-Resources Investigations Report 87-4090.


Related Geothermal Exploration Activities
Activities (1)


Areas (1)
  1. Long Valley Caldera Geothermal Area
Regions (0)