Caldera structure of submarine Volcano #1 on the Tonga Arc at 21 degrees 09 ' S, southwestern Pacific: Analysis of multichannel seismic profiling
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Title
- Caldera structure of submarine Volcano #1 on the Tonga Arc at 21 degrees 09 ' S, southwestern Pacific: Analysis of multichannel seismic profiling
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Author(s)
- Kim, Han-Joon; Jou, Hyeong-Tae; Lee, Gwang-Hoon; Na, Ji-Hoon; Kim, Hyun-Sub; Jang, Ugeun; Lee, Kyeong-Yong; Kim, Chang-Hwan; Lee, Sang Hoon; Park, Chan-Hong; Jung, Seom-Kyu; Suk, Bong-Cool
- KIOST Author(s)
- Kim, Hyun Sub(김현섭); Kim, Chang Hwan(김창환); Lee, Sang Hoon(이상훈); Park, Chan Hong(박찬홍); Jung, Seom Kyu(정섬규)
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Alternative Author(s)
- 김한준; 주형태; 김현섭; 이경용; 김창환; 이상훈; 박찬홍; 정섬규; 석봉출
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Publication Year
- 2013
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Abstract
- Volcano #1 is a large submarine stratovolcano with a summit caldera in the south central part of the Tonga Arc. We collected and analyzed multichannel seismic profiles in conjunction with magnetic data from Volcano #1 to investigate the structure of the intracaldera fill and processes of caldera formation. The intracaldera fill, exhibiting stratified units with a maximum thickness of 2 km, consists of at least four seismic units and a thick wedge of landslide debris derived from the caldera wall. The structural caldera floor, deepening toward the northwestern rim, suggests asymmetric collapse in the initial stage, which, in turn, appears to have contributed to the creation of a caldera elongated to the northwest by enhancing gravitational instability along the northwestern caldera boundary. Occasional, but repeated, eruptions resulted in a thick accumulation of the intracaldera fill and further subsidence in the mode of piston collapse. Magnetization lows are well-defined along the structural rim of the caldera that is interpreted as the inner principal ring fault. The magnetization lows indicate sites of submarine hydrothermal vents that caused an alteration of magnetic minerals. Faults recognized on the outer slope of the volcano are interpreted to be involved in hydrothermal fluid circulation.
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ISSN
- 1343-8832
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/3347
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DOI
- 10.5047/eps.2013.01.002
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Bibliographic Citation
- EARTH PLANETS AND SPACE, v.65, no.8, pp.893 - 900, 2013
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Publisher
- TERRA SCIENTIFIC PUBL CO
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Keywords
- Tonga Arc; Volcano #1; multichannel seismic sections; caldera infill; seismic unit; magnetic anomaly; hydrothermal activity
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Type
- Article
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Language
- English
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Document Type
- Article
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