P-wave velocity structure beneath Asama Volcano, Japan, inferred from active source seismic experiment

Yosuke Aoki, Minoru Takeo, Hiroshi Aoyama, Jun Fujimatsu, Satoshi Matsumoto, Hiroki Miyamachi, Haruhisa Nakamichi, Takahiro Ohkura, Takao Ohminato, Jun Oikawa, Rie Tanada, Tomoki Tsutsui, Keigo Yamamoto, Mare Yamamoto, Hitoshi Yamasato, Teruo Yamawaki

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


An active seismic survey with unprecedented density of seismometers found a high velocity zone to the west of the summit of Asama Volcano, Japan. The high velocity zone coincides with an area of magma-filled crack (dike) intrusion associated with the 2004 eruptions inferred from precise earthquake relocations and ground deformation modeling. It also coincides with an area of high resistivity surrounded by low resistivity, indicating that the solidification of magma due to repeating intrusions is responsible for the high velocity. This thus endorses the magma pathway previously speculated by seismic and geodetic observations. These findings demonstrate that dense seismic exploration combined with geophysical monitoring is an effective way to understand the dynamics of volcanic eruptions.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalJournal of Volcanology and Geothermal Research
Issue number3-4
Publication statusPublished - 2009 Nov 10


  • P-wave velocity structure
  • active source seismic experiment
  • dike intrusion
  • magma pathway

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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