Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii

Abstract

Research Article| October 01, 1997 Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii Paul G. Okubo; Paul G. Okubo 1U.S. Geological Survey, Hawaiian Volcano Observatory, P.O. Box 51, Hawaii National Park, Hawaii 96718 Search for other works by this author on: GSW Google Scholar Harley M. Benz; Harley M. Benz 2U.S. Geological Survey, Box 25046, M.S. 967, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Bernard A. Chouet Bernard A. Chouet 3U.S. Geological Survey, M.S. 977, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information Paul G. Okubo 1U.S. Geological Survey, Hawaiian Volcano Observatory, P.O. Box 51, Hawaii National Park, Hawaii 96718 Harley M. Benz 2U.S. Geological Survey, Box 25046, M.S. 967, Denver, Colorado 80225 Bernard A. Chouet 3U.S. Geological Survey, M.S. 977, 345 Middlefield Road, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (10): 867–870. https://doi.org/10.1130/0091-7613(1997)025<0867:ITCMSB>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paul G. Okubo, Harley M. Benz, Bernard A. Chouet; Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii. Geology 1997;; 25 (10): 867–870. doi: https://doi.org/10.1130/0091-7613(1997)025<0867:ITCMSB>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Three-dimensional seismic P-wave traveltime tomography is used to image the magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii. High-velocity bodies (>6.4 km/s) in the upper 9 km of the crust beneath the summits and rift zones of the volcanoes correlate with zones of high magnetic intensities and are interpreted as solidified gabbro-ultramafic cumulates from which the surface volcanism is derived. The proximity of these high-velocity features to the rift zones is consistent with a ridge-spreading model of the volcanic flank. Southeast of the Hilina fault zone, along the south flank of Kilauea, low-velocity material (<6.0 km/s) is observed extending to depths of 9–11 km, indicating that the Hilina fault may extend possibly as deep as the basal decollement. Along the southeast flank of Mauna Loa, a similar low-velocity zone associated with the Kaoiki fault zone is observed extending to depths of 6–8 km. These two upper crustal low-velocity zones suggest common stages in the evolution of the Hawaiian shield volcanoes in which these fault systems are formed as a result of upper crustal deformation in response to magma injection within the volcanic edifice. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.