Seismic reflection survey of the crustal structure beneath Unzen volcano, Kyushu, Japan

Satoshi Matsumoto, Hiroshi Shimizu, Masazumi Onishi, Kenji Uehira

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

Unzen volcano is located in the western part of Kyushu, Japan. We carried out a seismic reflection survey at Unzen volcano in order to elucidate the structure of the volcano. Although the survey was conducted in a volcanic area under difficult conditions, such as artificial noises and a complex structure, we were able to resolve the structure beneath the profile using vibrator sources and a large number of stacking signals. The processed depth sections confirmed that Unzen volcano developed in a graben structure, as has been suggested in other geological studies. We imaged many subsurface normal faults shallower than 1 km. These faults, mostly covered with volcanic lava and deposits, were identified at the surface. Strong reflectors were found at a depth of approximately 3 km. They were located just above the pressure source of the latest eruption, as inferred from geodetic data. The geometric relationship between the reflection image, the pressure source location, and the lava dome suggests that the conduit from the lava dome could connect to the magma chamber located 4 km away from the lava dome.

本文言語英語
ページ(範囲)405-414
ページ数10
ジャーナルearth, planets and space
64
5
DOI
出版ステータス出版済み - 2012

All Science Journal Classification (ASJC) codes

  • 地質学
  • 宇宙惑星科学

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