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Title: Deep borehole measurements for characterizing the magma/hydrothermal system at Long Valley Caldera, CA

Abstract

The Magma Energy Program of the Geothermal Technology Division is scheduled to begin drilling a deep (6 km) exploration well in long Valley Caldera, California in 1989. The drilling site is near the center of the caldera which is associated with numerous shallow (5-7 km) geophysical anomalies. This deep well will present an unparalleled opportunity to test and validate geophysical techniques for locating magma as well as a test of the theory that magma is still present at drillable depths within the central portion of the caldera. If, indeed, drilling indicates magma, the geothermal community will then be afforded the unique possibility of examining the coupling between magmatic and hydrothermal regimes in a major volcanic system. Goals of planned seismic experiments that involve the well include the investigation of local crystal structure down to depths of 10 km as well as the determination of mechanisms for local seismicity and deformation. Borehole electrical and electromagnetic surveys will increase the volume and depth of rock investigated by the well through consideration of the conductive structure of the hydrothermal and underlying regimes. 9 refs., 5 figs.

Authors:
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
6319993
Report Number(s):
SAND-89-0492C; CONF-890352-3
ON: DE89009324
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: US Department of Energy research and development for the geothermal marketplace: 7th geothermal program review, San Francisco, CA, USA, 21 Mar 1989; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 15 GEOTHERMAL ENERGY; EXPLORATORY WELLS; WELL LOGGING; MAGMA SYSTEMS; GEOTHERMAL ENERGY; HYDROTHERMAL SYSTEMS; MAGMA; MAPS; ROCK MECHANICS; WELL DRILLING; WELLS; DRILLING; ENERGY; ENERGY SOURCES; ENERGY SYSTEMS; GEOTHERMAL SYSTEMS; MECHANICS; RENEWABLE ENERGY SOURCES; Geothermal Legacy

Citation Formats

Carrigan, C R. Deep borehole measurements for characterizing the magma/hydrothermal system at Long Valley Caldera, CA. United States: N. p., 1989. Web.
Carrigan, C R. Deep borehole measurements for characterizing the magma/hydrothermal system at Long Valley Caldera, CA. United States.
Carrigan, C R. Sun . "Deep borehole measurements for characterizing the magma/hydrothermal system at Long Valley Caldera, CA". United States. https://www.osti.gov/servlets/purl/6319993.
@article{osti_6319993,
title = {Deep borehole measurements for characterizing the magma/hydrothermal system at Long Valley Caldera, CA},
author = {Carrigan, C R},
abstractNote = {The Magma Energy Program of the Geothermal Technology Division is scheduled to begin drilling a deep (6 km) exploration well in long Valley Caldera, California in 1989. The drilling site is near the center of the caldera which is associated with numerous shallow (5-7 km) geophysical anomalies. This deep well will present an unparalleled opportunity to test and validate geophysical techniques for locating magma as well as a test of the theory that magma is still present at drillable depths within the central portion of the caldera. If, indeed, drilling indicates magma, the geothermal community will then be afforded the unique possibility of examining the coupling between magmatic and hydrothermal regimes in a major volcanic system. Goals of planned seismic experiments that involve the well include the investigation of local crystal structure down to depths of 10 km as well as the determination of mechanisms for local seismicity and deformation. Borehole electrical and electromagnetic surveys will increase the volume and depth of rock investigated by the well through consideration of the conductive structure of the hydrothermal and underlying regimes. 9 refs., 5 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6319993}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Conference:
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