Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1986

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Report: Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1986

Abstract
The U.S. Geological Survey continued to monitor hydrologic and geochemical conditions in the Long Valley caldera during 1986. The monitoring is directed toward detecting changes in the hydrologic system caused by tectonic or magmatic processes. Data collected during 1986 include chemical and isotopic composition of water from selected stream sites, springs, and wells; pumpage from four geothermal wells; flow rates of selected springs and stream sites; mean daily water or gas temperatures at selected sites; mean daily atmospheric pressures and water levels at selected wells, and precipitation records for two sites.Seismicity within the caldera persisted at a relatively low level compared with the more active periods of 1978-84. The most significant events of seismicity that affected hydrologic monitoring sites in Long Valley during 1986 occurred during July, in response to the Chalfant Valley earthquakes, centered about 20 miles southeast of the caldera. Water-level records for three wells show distinct responses to the Chalfant Valley earthquakes.

Authors 
Christopher D. Farrar, M.L. Sorey, S.A. Rojstaczer, A.C. Steinemann and M.D. Clark








Published 
U.S. Geological Survey, 1989



Report Number 
Water-Resources Investigations Report 89-4033


DOI 
Not Provided
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Online 
Internet link for Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1986

Citation

Christopher D. Farrar,M.L. Sorey,S.A. Rojstaczer,A.C. Steinemann,M.D. Clark. 1989. Hydrologic and Geochemical Monitoring in Long Valley Caldera, Mono County, California, 1986. Sacramento, CA: U.S. Geological Survey. Report No.: Water-Resources Investigations Report 89-4033.


Related Geothermal Exploration Activities
Activities (1)


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