Core photos, Hole 1 (PTA-2), Humu‘ula Groundwater Research Project

Thomas, Donald M.; Lautze, Nicole C.; Haskins, Eric

Core photos, Hole 1 (PTA-2), Humu‘ula Groundwater Research Project

dc.contributor.author	Thomas, Donald M.
dc.contributor.author	Lautze, Nicole C.
dc.contributor.author	Haskins, Eric
dc.contributor.depositor	Kim, Alice
dc.date.accessioned	2020-08-07T12:52:44Z
dc.date.available	2020-08-07T12:52:44Z
dc.date.issued	2016
dc.description	The site of the first hole was based on results of a geophysical (Magnetotelluric or MT) survey. We drilled into the area where the measured subsurface resistivity is consistent with highest level water saturation – on the southern edge of the Pohakuloa Training Area cantonment. During the drilling, we encountered the following: - ~215 meters (700’) below the ground surface — The initial stable saturated zone. - ~215 meters (700’) – 345 meters (830’) — A perching layer of clay-rich ash. Water levels began to drop. - 345 meters (830’) – ~550 meters (1,800’) — Dry rock. - ~550 meters (1,800’) — A second saturated interval. - ~550 meters (1,800’) – 1,763 meters (5,780’) — Water levels in the borehole remained stable. This deeper water is likely the regional water table for this area. - ~1,000 m and beyond — The borehole temperatures showed significant increases. Intervals of intruded dike rocks indicate a dike-impounded aquifer. Along with the unexpected presence of high-elevation water, the borehole temperatures significantly increased below depths of ~1,000 m, suggestive of a previously unknown geothermal reservoir in the Saddle region.
dc.description.abstract	Also known as “PTA” or “Saddle Road Project,” the Humuʻula Groundwater Research Project (HGRP) aimed to research the groundwater resources in the Hawaiʻi Island ‘Saddle’ region between Mauna Loa and Mauna Kea volcanoes by drilling two test holes on Army Garrison Hawaii land. Results include the discovery of: i) groundwater at a much shallower depth than expected, ii) a dike-impounded aquifer, and iii) a potential geothermal reservoir. By using the diamond wireline core drilling technology, we collected a continuous sequence of rock core. We documented our progress in a blog and made a complete stratigraphic record of the region. This continuous stratigraphic sequence contained subaerial shield-stage and post-shield-stage lava rock and ash samples from the Mauna Kea Volcano, documenting the area’s environmental, geologic, hydrologic, and thermal history.
dc.description.sponsorship	The U.S. Army funded the drilling, initial characterization of the core, and ongoing analyses of the fluid. Detailed logging of the core was supported by the National Science Foundation.
dc.format.extent	1,058 pages
dc.identifier.uri	http://hdl.handle.net/10524/63332
dc.language.iso	en-US
dc.publisher	University of Hawaii at Manoa
dc.publisher	Hawaii Groundwater and Geothermal Resources Center
dc.publisher	Humu‘ula Groundwater Research Project
dc.relation.uri	https://www.higp.hawaii.edu/hggrc/
dc.rights	CC0 1.0 Universal	*
dc.rights.uri	http://creativecommons.org/publicdomain/zero/1.0/	*
dc.subject	core logging
dc.subject	core samples
dc.subject	Hawaii--Mauna Kea
dc.subject	Hawaii--Mauna Loa (Hawaii Island)
dc.subject	Humuʻula Groundwater Research Project
dc.subject	drill cores
dc.subject	well logging
dc.subject	Water table
dc.subject	Groundwater flow
dc.subject	Groundwater
dc.subject.lcsh	Drill cores -- Hawaii -- Mauna Kea
dc.subject.lcsh	Drill cores -- Hawaii -- Mauna Loa
dc.subject.lcsh	Volcanism -- Hawaii -- Mauna Kea
dc.subject.lcsh	Volcanism -- Hawaii -- Mauna Loa
dc.subject.lcsh	Hawaii -- Mauna Kea
dc.subject.lcsh	Hawaii -- Mauna Loa
dc.title	Core photos, Hole 1 (PTA-2), Humu‘ula Groundwater Research Project
dc.type	Image
dc.type.dcmi	Dataset