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Low velocity zone under Long Valley as determined from teleseismic events
Steeples, Don W. Lyer, H. M.
Steeples, Don W.
Lyer, H. M.
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Abstract
A temporary seismograph station network was used to estimate teleseismic P wave residuals in the vicinity of Long Valley geothermal area, California. Relative P wave delays of 0.3 s persist at stations in the west central part of the Long Valley caldera after regional and near-surface effects have been removed. Ray tracing indicates that low-velocity material exists beneath the caldera at depths greater than 7 km and less than 40 km, probably less than 25 km. The velocity contrast with normal crust must be at least 5% to satisfy the data and is probably in the range 10–15%. We believe that the low velocity indicates anomalously hot rock at depth and that relative teleseismic P residuals may be useful for investigation of sources of geothermal energy.
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This is the published version. Copyright 1976 American Geophysical Union. All Rights Reserved.
Date
1976-02-10
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American Geophysical Union
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Steeples, D. W., and H. M. Iyer (1976), Low-velocity zone under long valley as determined from teleseismic events, J. Geophys. Res., 81(5), 849–860, http://dx.doi.org/10.1029/JB081i005p00849