| 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. |
| Genre: | Article |
| ProdID: | 70019466 |
| Citation Author: | Okubo, P. G.; Benz, H. M.; Chouet, B. A. |
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| Citation End Page: | 870 |
| Citation Issue: | 10 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii; 1997; Article; Journal; Geology; Okubo, P. G.; Benz, H. M.; Chouet, B. A. |
| Citation Start Page: | 867 |
| Citation Volume: | 25 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii; 1997; Article; Journal; Geology; Okubo, P. G.; Benz, H. M.; Chouet, B. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
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