Shallow Velocity Structure Beneath the Aira Caldera and Sakurajima Volcano as Inferred from Refraction Analysis of the Seismic Experiment in 2008(<Special Section>Sakurajima Special Issue)
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- MIYAMACHI Hiroki
- Graduate School of Science and Engineering, Kagoshima University
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- TOMARI Chisato
- Graduate School of Science and Engineering, Kagoshima University
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- YAKIWARA Hiroshi
- Graduate School of Science and Engineering, Kagoshima University
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- IGUCHI Masato
- Disaster Prevention Research Institute, Kyoto University
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- TAMEGURI Takeshi
- Disaster Prevention Research Institute, Kyoto University
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- YAMAMOTO Keigo
- Disaster Prevention Research Institute, Kyoto University
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- OHKURA Takahiro
- Graduate School of Science, Kyoto University
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- ANDO Takashi
- Graduate School of Science, Kyoto University
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- ONISHI Kyosuke
- Graduate School of Engineering, Kyoto University
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- SHIMIZU Hiroshi
- Graduate School of Science, Kyushu University
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- YAMASHITA Yusuke
- Graduate School of Science, Kyushu University
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- NAKAMICHI Haruhisa
- Graduate School of Environmental Studies, Nagoya University
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- YAMAWAKI Teruo
- Volcanic Fluid Research Center, Tokyo Institute of Technology
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- OIKAWA Jun
- Earthquake Research Institute, University of Tokyo
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- UEKI Sadato
- Graduate School of Science, Tohoku University
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- TSUTSUI Tomoki
- Faculty of Engineering and Resource Science, Akita University
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- MORI Hitoshi
- Graduate School of Science, Hokkaido University
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- NISHIDA Makoto
- Japan Meteorological Agency
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- HIRAMATSU Hideyuki
- Japan Meteorological Agency
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- KOEDA Tomoyuki
- Japan Meteorological Agency
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- MASUDA Yoshirou
- Japan Meteorological Agency
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- KATOU Kouji
- Japan Meteorological Agency
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- HATAKEYAMA Kengo
- Japan Meteorological Agency
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- KOBAYASHI Tetsuo
- Graduate School of Science and Engineering, Kagoshima University
Bibliographic Information
- Other Title
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- 屈折法地震探査による姶良カルデラと桜島火山の浅部速度構造(<特集>桜島火山)
- Shallow Velocity Structure Beneath the Aira Caldera and Sakurajima Volcano as Inferred from Refraction Analysis of the Seismic Experiment in 2008
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Abstract
We performed refraction analysis for the first P-wave arrival time data observed in the seismic experiment in 2008, and estimated a shallow velocity model up to 3 km depth beneath the Aira caldera and Sakurajima volcano. We found that a basement layer with a velocity of 4.6-5.0 km/s, which corresponds to geologically the Shimanto Group, inclines toward the central part of the Aira caldera. A low velocity zone with a velocity of 4.2-4.4 km/s is located in a depth range 1.5-3 km in the central part of the caldera. This low velocity zone suggests high activity of the magma plumbing system from the deep magma reservoir distributed beneath the caldera. It is found that the basement layer steeply falls down from 1 km to 2.5 km in depth along the northwestern boundary of the Kagoshima graben. The velocity structure in Sakurajima volcano is characterized by a zone with a velocity of 3.6-3.7 km/s. Moreover, we present a possibility that the underground structure strongly restricts an expanse of a focal region of each different type of the volcanic earthquakes.
Journal
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- BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN
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BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 58 (1), 227-237, 2013
The Volcanological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204304864256
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- NII Article ID
- 110009597103
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- NII Book ID
- AN10512786
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- ISSN
- 21897182
- 04534360
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- NDL BIB ID
- 024573470
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- CiNii Articles
- Crossref
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- Abstract License Flag
- Disallowed