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Title: Gravity and fault structures, Long Valley caldera, California

Abstract

The main and catastrophic phase of eruption in Long Valley occurred 0.73 m.y. ago with the eruption of over 600 km/sup 3/ of rhyolitic magma. Subsequent collapse of the roof rocks produced a caldera which is now elliptical in shape, 32 km east-west by 17 km north-south. The caldera, like other large Quarternary silicic ash-flow volcanoes that have been studied by various workers, has a nearly coincident Bouguer gravity low. Earlier interpretations of the gravity anomaly have attributed the entire anomaly to lower density rocks filling the collapsed structure. However, on the basis of many additional gravity stations and supporting subsurface data from several new holes, a much more complex and accurate picture has emerged of caldera structure. From a three-dimensional inversion of the residual Bouguer gravity data we can resolve discontinuities that seem to correlate with extensions of pre-caldera faults into the caldera and faults associated with the ring fracture. Some of these faults are believed related to the present-day hydrothermal upflow zone and the zone of youngest volcanic activity within the caldera.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
6051142
Report Number(s):
LBL-23648; CONF-871024-15
ON: DE87014117
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the Geothermal Resources Council, Sparks, NV, USA, 12 Oct 1987; Other Information: Paper copy only, copy does not permit microfiche production
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; CALDERAS; GEOLOGIC MODELS; LONG VALLEY; GEOLOGIC FAULTS; GRAVITY SURVEYS; CALIFORNIA; FEDERAL REGION IX; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; GEOPHYSICAL SURVEYS; NORTH AMERICA; SURVEYS; USA; Geothermal Legacy

Citation Formats

Carle, S F, and Goldstein, N E. Gravity and fault structures, Long Valley caldera, California. United States: N. p., 1987. Web.
Carle, S F, & Goldstein, N E. Gravity and fault structures, Long Valley caldera, California. United States.
Carle, S F, and Goldstein, N E. 1987. "Gravity and fault structures, Long Valley caldera, California". United States. https://www.osti.gov/servlets/purl/6051142.
@article{osti_6051142,
title = {Gravity and fault structures, Long Valley caldera, California},
author = {Carle, S F and Goldstein, N E},
abstractNote = {The main and catastrophic phase of eruption in Long Valley occurred 0.73 m.y. ago with the eruption of over 600 km/sup 3/ of rhyolitic magma. Subsequent collapse of the roof rocks produced a caldera which is now elliptical in shape, 32 km east-west by 17 km north-south. The caldera, like other large Quarternary silicic ash-flow volcanoes that have been studied by various workers, has a nearly coincident Bouguer gravity low. Earlier interpretations of the gravity anomaly have attributed the entire anomaly to lower density rocks filling the collapsed structure. However, on the basis of many additional gravity stations and supporting subsurface data from several new holes, a much more complex and accurate picture has emerged of caldera structure. From a three-dimensional inversion of the residual Bouguer gravity data we can resolve discontinuities that seem to correlate with extensions of pre-caldera faults into the caldera and faults associated with the ring fracture. Some of these faults are believed related to the present-day hydrothermal upflow zone and the zone of youngest volcanic activity within the caldera.},
doi = {},
url = {https://www.osti.gov/biblio/6051142}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 1987},
month = {Wed Jul 01 00:00:00 EDT 1987}
}

Conference:
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