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Detailed Reference Information |
Stanley, W.D., Jackson, D.B. and Zohdy, A.A.R. (1976). Deep electrical investigations in the Long Valley geothermal area, California. Journal of Geophysical Research 81. doi: 10.1029/JB081i005p00810. issn: 0148-0227. |
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Direct current resistivity and time domain electromagnetic techniques were used to study the electrical structure of the Long Valley geothermal area. A resistivity map was complied from 375 total field resistivity measurements. Two significant zones of low resistivity were detected, one near Casa Diablo Hot Srpings and one surrounding the Cashbaugh Ranch-Whitmore Hot Springs area. Thes anomalies and other parts of the caldera were investigated in detail with 49 Schlumberger dc soundings and 13 transient electromagnetic soundings. An extensive conductive zone of 1- to 10-&OHgr;m resistivity was found to be the cause of the total field resistivity lows. Drill hole information indicates that the shallow parts of the conductive zone in the eastern part of the caldera contain water of only 73¿C and consist of highly colitized tuffs and ashes in the places that were tested. A deeper zone near Whitmore Hot Springs is somewhat more promising in potential for hot water, but owing to the extensive alteration prevalent in the caldera the presence of hot water cannot be definitely assumed. The resistivity results indicate that most of the past hydrothermal activity, and probably most of the present activity, is controlled by fracture systems related to regional Sierran faulting. |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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