Temporal changes in the Earth's interior with seismic interferometry

• Project/Area Number: 21740319
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: AOKI Yosuke 東京大学, 地震研究所, 助教 (90376624)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 地震波干渉法 / 地震波速度構造 / マグマ供給経路 / 表面波 / 地下構造 / 波動伝搬 / 地下構造の時間変化

Research Abstract

We derived the seismic velocity and its temporal changes of Asama Volcano, Japan, where rich seismic dataset exists. We found a prominent low velocity body at depths of 5-10 km to the west of the summit. The low velocity body we found in this study has its diameter of 5 km or less, so that it has been impossible to detect with conventional seismic tomography techniques.

Research Products

• [Journal Article] Seismic imaging of magma chamber beneath an active volcano (2012)
  • Author(s): Nagaoka, Y., Nishida, K., Aoki, Y., Takeo, M., Ohminato, T
  • Journal Title: Earth and Planetary Science Letters Volume: 1-8 Pages: 333-334
  • DOI: 10.1016/j.epsl.2012.03.034
  • Peer Reviewed
• [Journal Article] Monitoring volcano using seismic noise correlations (2011)
  • Author(s): Brenguier, F., Clark, D., Aoki, Y., Shapiro, N. M., Campillo, M., Ferrazini, V
  • Journal Title: Comptes Rendus Geoscience Volume: 343 Issue: 8-9 Pages: 633-638
  • DOI: 10.1016/j.crte.2010.12.010
• [Journal Article] Temporal changes of phase velocity beneath Mt. Asama, Japan, inferred from coda wave interferometry (2010)
  • Author(s): Nagaoka, Y., Nishida, K., Aoki, Y., Takeo, M
  • Journal Title: Geophysical Research Letters Volume: 37 Issue: 22
  • DOI: 10.1029/2010gl045289
• [Journal Article] Absolute stress and its temporal variation at Mt. Asama volcano, Japan, from seismic anisotropy and GPS (2010)
  • Author(s): Savage, M. K., Ohminato, T., Aoki, Y., Tsuji, H., Greve, S. M
  • Journal Title: Earth and Planetary Science Letters Volume: 290 Issue: 3-4 Pages: 403-414
  • DOI: 10.1016/j.epsl.2009.12.037
• [Journal Article] Temporal change of phase velocity beneath Mt.Asama, Japan, inerred from coda wave interferometry (2010)
  • Author(s): 長岡優
  • Journal Title: Geophysical Research Letters Volume: 37
  • Peer Reviewed
• [Presentation] 脈動記録を用いた浅間山の地殻内速度構造の推定 (2011)
  • Author(s): 青木陽介
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ(千葉市)
  • Year and Date: 2011-05-23
• [Presentation] Changes in isotropic and anisotropic velocity before eruptions at Piton de la Fournaise volcano (2011)
  • Author(s): Savage, M. K., Rivemale, E., Ferrazzini, V., Brenguier, F., Aoki, Y., Clarke, D. S., Massin, F., Fontaine, F., Roult, G. C.
  • Organizer: American Geophysical Union Fall Meeting
• [Presentation] 脈動記録を用いた浅間山地殻内速度構造の推定 (2011)
  • Author(s): 長岡優・西田究・青木陽介・武尾実・大湊隆雄
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] Temporal change of phase velocity beneath Mt.Asama, Japan, inferred from coda wave interferometry (2010)
  • Author(s): 青木陽介
  • Organizer: 米国地球物理学会秋季大会
  • Place of Presentation: 米国サンフランシスコ市
  • Year and Date: 2010-12-14
• [Presentation] コーダ波干渉法による浅間山直下の位相速度の時間変化 (2010)
  • Author(s): 長岡優
  • Organizer: 日本地震学会秋季大会
  • Place of Presentation: 広島市広島国際会議場
  • Year and Date: 2010-10-29
• [Presentation] Temporal changes of phase velocity beneath Mt. Asama, Japan, inferred from coda wave interferometry (2010)
  • Author(s): Nagaoka, Y., Nishida, K., Aoki, Y., Takeo, M.
  • Organizer: American Geophysical Union Fall Meeting
• [Presentation] Geophysical monitoring of Mt.Asama, Japan, during the 2008-9 eruptions (2009)
  • Author(s): 青木陽介
  • Organizer: 米国地球物理学会
  • Place of Presentation: 米国サンフランシスコ
  • Year and Date: 2009-12-16
• [Presentation] Temporal change of seismic wavefield during the 2007 eruption of Piton de la Fournaise, La Reunion, islnad (2009)
  • Author(s): 青木陽介
  • Organizer: 米国地球物理学会
  • Place of Presentation: 米国サンフランシスコ
  • Year and Date: 2009-12-15
• [Presentation] Geophysical monitoring of Mt. Asama, Japan, during the 2008-9 eruptions (2009)
  • Author(s): Aoki, Y., Takeo, M., Ohminato, T.
  • Organizer: American Geophysical Union Fall Meeting
• [Presentation] Tempora lvariation of stress at Mt. Asama volcano, Japan, from seismic anisotropy and GPS (2009)
  • Author(s): Savage, M. K., Ohminato, T., Aoki, Y., Tsuji, H., Greve, S. M.
  • Organizer: American Geophysical Union Fall Meeting
• [Presentation] Temporal changes of seismic wavefield during the 2007 eruptios of Piton de la Fournaise Volcano (2009)
  • Author(s): Aoki, Y., Ferrazzini, V.
  • Organizer: La Reunion island, American Geophysical Union Fall Meeting