Geophysical surveys -- Island of Molokai, Hawaii

dc.contributor.author Nance, Tom
dc.date.accessioned 2019-05-22T00:47:49Z
dc.date.available 2019-05-22T00:47:49Z
dc.date.issued 1990-03-29
dc.description.abstract This 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.sponsorship Alpha U.S.A., Inc.
dc.format.extent 41 pages
dc.format.extent 93 pages
dc.format.extent 21 pages
dc.identifier.other Project #90007
dc.identifier.uri http://hdl.handle.net/10125/61980
dc.language.iso eng
dc.publisher Blackhawk Geosciences, Inc.
dc.publisher Tom Nance Water Resource Engineering
dc.subject groundwater
dc.subject TDEM
dc.subject Molokai
dc.subject Hawaii
dc.subject.lcsh Geology--Hawaii
dc.subject.lcsh Groundwater--Hawaii
dc.subject.lcsh Water-supply--Hawaii
dc.subject.lcsh Geology
dc.subject.lcsh Groundwater
dc.subject.lcsh Water-supply
dc.title Geophysical surveys -- Island of Molokai, Hawaii
dc.type Report
dc.type.dcmi Text
Files
Original bundle
Now showing 1 - 5 of 9
No Thumbnail Available
Name:
1990-GeophysMolokai1.pdf
Size:
3 MB
Format:
Adobe Portable Document Format
Description:
No Thumbnail Available
Name:
1990-GeophysMolokai1-1.tif
Size:
223.55 MB
Format:
Tag Image File Format
Description:
No Thumbnail Available
Name:
1990-GeophysMolokai1-2.tif
Size:
395.27 MB
Format:
Tag Image File Format
Description:
No Thumbnail Available
Name:
1990-GeophysMolokai2.pdf
Size:
5.11 MB
Format:
Adobe Portable Document Format
Description:
No Thumbnail Available
Name:
1990-GeophysMolokai2-1.tif
Size:
649.42 MB
Format:
Tag Image File Format
Description: