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The subsurface resistivity structure of Kilauea Volcano, Hawai'i

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Item Summary Kauahikaua, James P. 2011-12-14T00:56:55Z 2011-12-14T00:56:55Z 2011-12-13
dc.description ill
dc.description.abstract Using the controlled-source electromagnetic technique, resistivity soundings were obtained at 49 locations around the summit caldera and upper rift zones of Kilauea volcano. Each sounding consisted of vector measurements of the magnetic field induced by a large-moment horizontal loop current source at discrete frequencies between 0.04 and 8 Hz. The source-to-sensor distances ranged from 2.5 to 13 km. The data have been computer-inverted to produce a best-fitting horizontally layered earth model. Although each sounding's interpretation is different in detail, the volcano’s structure appears simple and can be represented by four, subhorizontal layers. The surface layer is highly resistive and with. the dry, basaltic overburden. At a depth of 500 to 1000 m, resistivities decrease abruptly to between 30 and 50 ohm-m, marking the top of the water-saturated zone. The third layer occurs between 2 and 3 km depth and has a resistivity of less than 10 ohm-m and a total conductance of about 200 mhos. This layer is underlain everywhere by highly resistive rock to a depth of at least 6 km, the estimated limit of penetration by this study. Pockets of low resistivity (less than 20 ohm--m) occur irregularly within the high-resistivity basement. Because of its widespread occurrence, 'the shallower conductive layer (layer 3) is probably water-saturated rock at high, temperature; however, the possibility of thin, intruded sills of magma contributing to the low resistivities cannot be refuted, The pockets of low resistivity within layer 4 occur at a depth of 5 km and are believed to be magma chamber 2 to 3 km deeper than models derived from earthquake hypocenter location and surface deformation studies.
dc.format.extent xv, 189 leaves
dc.language.iso en-US
dc.publisher University of Hawaii at Manoa
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii at Manoa). Geology and Geophysics; no. 1549
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dc.subject theses
dc.subject Kilauea
dc.subject resistivity
dc.subject.lcsh Volcanoes--Hawaii--Hawaii Island
dc.subject.lcsh Earth resistance--Hawaii--Kilauea Volcano
dc.subject.lcsh Earth resistance
dc.subject.lcsh Kilauea Volcano (Hawaii)
dc.title The subsurface resistivity structure of Kilauea Volcano, Hawai'i
dc.type Dissertation
dc.type.dcmi Text
dc.contributor.department Geology and Geophysics 5/1/1982
local.identifier.callnumber AC1 .H3 no.1549
local.thesis.degreelevel Ph.D
Appears in Collections: Ph.D. - Geology and Geophysics
The Geothermal Collection

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