Pre‐drilling data review and synthesis for the Long Valley Caldera, California

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Abstract
A 2‐day symposium was held at the Lawrence Berkeley Laboratory (LBL) on March 17–18, 1987, to review a large body of scientific investigations for the Long Valley Caldera and to discuss concepts and models for the present‐day magmatic‐hydrothermal system. Speakers at the symposium also addressed the problem of where to locate future scientific drill holes in the caldera.Deep scientific drilling projects such as those being contemplated by the U.S. Department of Energy (DOE) Geothermal Technologies Division (GTD), under the Magma Energy Program, and by the DOE Office of Basic Energy Sciences (OBES) along with the U.S. Geological Survey (USGS) and the National Science Foundation (NSF), under the Continental Scientific Drilling Program (CSDP), will be major and expensive national undertakings that will require strong support from geoscientists and engineers and from industry and government‐supported laboratories. DOE/OBES is sponsoring a program of relatively shallow core holes (less than 1 km) in the caldera, and DOE/GTD is considering the start of a deep (6‐km) hole for geophysical observations and sampling of the near‐magmatic environment as early as fiscal year (FY) 1988.