Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey

S. Tanaka, H. Hamaguchi, T. Nishimura, T. Yamawaki, S. Ueki, H. Nakamichi, T. Tsutsui, H. Miyamachi, N. Matsuwo, J. Oikawa, T. Ohminato, K. Miyaoka, S. Onizawa, T. Mori, K. Aizawa

Research output: Contribution to journalArticle

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Abstract

The three-dimensional P-wave velocity structure of the Iwate volcano, northeastern Japan, is determined to depths of 2 km through an active seismic survey conducted in October 2000. Seismic tomography is applied to approximately 2700 travel-time data. The most prominent discovery is an existing of column-like high-velocity body (Vp > 5.4 km/s) that extends vertically for 2 km beneath the caldera. While the western part of the volcano extending from the caldera is characterized by a moderate-velocity region (4.8 < Vp < 5.4 km/s), the summit and eastern flank of the volcano are covered with very low-velocity material (Vp < 4 km/s) which represent relatively younger volcanic edifices. The spatial difference in the velocity structures between the western and eastern parts of the volcano is explained by the evolutionary history of the volcano. And we find that the western structure may give constraints on the volcanic activity in 1998.

Original languageEnglish
JournalGeophysical Research Letters
Volume29
Issue number10
Publication statusPublished - May 15 2002
Externally publishedYes

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seismic survey
velocity structure
P waves
volcanoes
P-wave
wave velocity
Japan
volcano
calderas
caldera
volcanology
seismic tomography
travel time
travel
low speed
tomography
histories
history

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Tanaka, S., Hamaguchi, H., Nishimura, T., Yamawaki, T., Ueki, S., Nakamichi, H., ... Aizawa, K. (2002). Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey. Geophysical Research Letters, 29(10).

Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey. / Tanaka, S.; Hamaguchi, H.; Nishimura, T.; Yamawaki, T.; Ueki, S.; Nakamichi, H.; Tsutsui, T.; Miyamachi, H.; Matsuwo, N.; Oikawa, J.; Ohminato, T.; Miyaoka, K.; Onizawa, S.; Mori, T.; Aizawa, K.

In: Geophysical Research Letters, Vol. 29, No. 10, 15.05.2002.

Research output: Contribution to journalArticle

Tanaka, S, Hamaguchi, H, Nishimura, T, Yamawaki, T, Ueki, S, Nakamichi, H, Tsutsui, T, Miyamachi, H, Matsuwo, N, Oikawa, J, Ohminato, T, Miyaoka, K, Onizawa, S, Mori, T & Aizawa, K 2002, 'Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey', Geophysical Research Letters, vol. 29, no. 10.
Tanaka S, Hamaguchi H, Nishimura T, Yamawaki T, Ueki S, Nakamichi H et al. Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey. Geophysical Research Letters. 2002 May 15;29(10).
Tanaka, S. ; Hamaguchi, H. ; Nishimura, T. ; Yamawaki, T. ; Ueki, S. ; Nakamichi, H. ; Tsutsui, T. ; Miyamachi, H. ; Matsuwo, N. ; Oikawa, J. ; Ohminato, T. ; Miyaoka, K. ; Onizawa, S. ; Mori, T. ; Aizawa, K. / Three-dimensional P-wave velocity structure of Iwate volcano, Japan from active seismic survey. In: Geophysical Research Letters. 2002 ; Vol. 29, No. 10.
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