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

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Title:Core photos, Hole 2 (KMA-1), Humu‘ula Groundwater Research Project
Authors:Thomas, Donald M.
Lautze, Nicole C.
Haskins, Eric
Keywords:core logging
core samples
Hawaii--Mauna Kea
Hawaii--Mauna Loa (Hawaii Island)
Humuʻula Groundwater Research Project
show 5 moredrill cores
well logging
Water Table
Groundwater flow
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LC Subject Headings:Drill cores -- Hawaii -- Mauna Kea
Drill cores -- Hawaii -- Mauna Loa
Volcanism -- Hawaii -- Mauna Kea
Volcanism -- Hawaii -- Mauna Loa
Hawaii -- Mauna Kea
show 1 moreHawaii -- Mauna Loa
show less
Date Issued:2016
Publisher:University of Hawaii at Manoa
Hawaii Groundwater and Geothermal Resources Center
Humu‘ula Groundwater Research Project
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.
Description:To measure the extent of the regional table found by the first hole, we drilled a second test hole approximately 10 kilometers west of the PTA-2 borehole. Within the top ~1,500 meters the hole did not encounter the regional aquifer, but found a sequence of confined, pressurized aquifers from ~300 meters below the ground surface. Layers of soil, ash, or explosive eruptive deposits confined these aquifers as highly pressurized water trapped between impermeable layers. Hence, as we drilled into the aquifers, water came spouting from the point of entry to up the drill string to several hundred to several thousand feet.
Pages/Duration:538 pages
Rights:CC0 1.0 Universal
Appears in Collections: The Geothermal Collection

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