Geophysical surveys -- Island of Molokai, Hawaii

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dc.contributor.authorNance, Tom
dc.date.accessioned2019-05-22T00:47:49Z
dc.date.available2019-05-22T00:47:49Z
dc.date.issued1990-03-29
dc.description.abstractThis report covers the results of geophysical surveys conducted by-Blackhawk Geosciences, Inc. (BGI) for Alpha U.S.A., Inc. (Alpha) on the island of Molokai, Hawaii. The field work was performed between February 15 and March 4, 1990. Three separate geophysical surveys were used by BGI. The geophysical surveys conducted and their individual objectives are as follows: 1. Seismic refraction surveys were utilized to map the depth to volcanic rocks and the seismic velocity distribution of the rock units in the area of Kamkaipo located in the southwest corner of the island. The seismic velocity distribution was subsequently correlated to mode and ease of excavation. 2. Gravity surveys were performed to outline intrusive (dense) bodies which may form a base to dike-impounded ground water and may be a source of vertical impounding dikes. 3. Time domain electromagnetic CTDEM) surveys were conducted to map the thickness of the fresh to brackish water lens and the location of dike-impounded ground water to better outline the geohydrologic system of Molokai's central aquifer area. In addition, work was performed to further delineate areas of relatively thick brackish water lenses identified in the previous TDEM survey in the western portion of Molokai. The report is written in two parts. The first part consists of the TDEM and gravity surveys which address the mapping of ground water resources on Molokai, and the results of the seismic survey are contained in the second portion.
dc.description.sponsorshipAlpha U.S.A., Inc.
dc.format.extent41 pages
dc.format.extent93 pages
dc.format.extent21 pages
dc.identifier.otherProject #90007
dc.identifier.urihttp://hdl.handle.net/10125/61980
dc.language.isoeng
dc.publisherBlackhawk Geosciences, Inc.
dc.publisherTom Nance Water Resource Engineering
dc.subjectgroundwater
dc.subjectTDEM
dc.subjectMolokai
dc.subjectHawaii
dc.subject.lcshGeology--Hawaii
dc.subject.lcshGroundwater--Hawaii
dc.subject.lcshWater-supply--Hawaii
dc.subject.lcshGeology
dc.subject.lcshGroundwater
dc.subject.lcshWater-supply
dc.titleGeophysical surveys -- Island of Molokai, Hawaii
dc.typeReport
dc.type.dcmiText

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