A study on heterogeneity in the seismic structure within the Pacific plate subducting at the Kuril and Japan Trench

• Project/Area Number: 19540436
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University
• Principal Investigator: HINO Ryota Tohoku University, 大学院・理学研究科, 准教授 (00241521)
• Co-Investigator(Kenkyū-buntansha): MIURA Seiichi 海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (00371724) ; FUJIE Go 海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (50371729)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 海底人工地震探査 / 海洋性地殻 / スラブマントル / 地震波トモグラフィ / アウターライズ地震

Research Abstract

Seismic structure in the Pacific lithosphere around the Japan and Kuril Trenches has been clarified by offshore seismic observations. The results indicate that the seismic velocity in the oceanic crust and uppermost mantle is altered by fracture development accompanied by down-bending of the lithosphere in the subduction process.

Research Products

• [Journal Article] Insight into complex rupturing of the immature bending normal fault in the outer slope of the Jaan Trench from aftershocks of the 2005 Sanriku earthquake (Mw=7.0) located by ocean bottom seismometry (2009)
  • Author(s): Hino, R., R. Azuma, Y. Ito, Y. Yamamoto, K. Suzuki, H. Tsuhima, S. Suzuki, M. Miyashita, T. Tomori, M. Arizono, G. Tange
  • Journal Title: Geochemistry Geophysics Geosystems Vol. 10
  • Peer Reviewed
• [Journal Article] Heterogeneous structure around the rupture area of the 2003 Tokachi-oki earthquake (Mw=8.0), Japan, as revealed by aftershock observatoins using Ocean Bottom Seismometers (2009)
  • Author(s): Machida, Y., M. Shinohara, T. Takanami, Y. Murai, T. Yamada, N. Hirata, K. Suyehiro, T. Kanazawa, Y. Kaneda, H. Mikada, S. Sakai, T. Watanabe, K. Uehira, N. Takahashi, M. Nishino, K. Mochizuki, T. Sato, E. Araki, R. Hino, K. Uhira, H. Shiobara, H. Shimizu
  • Journal Title: Tectonophysics Vol. 465 Pages: 164-176
  • Peer Reviewed
• [Journal Article] Crustal evolution of the southwestern Kuril Arc, Hokkaido Japan, deduced from seismic velocity and geochemical structure (2009)
  • Author(s): Nakanishi, A., E. Kurashimo, Y. Tatsumi, H. Yamaguchi, S. Miura, S. Kodaira, K. Obana, N. Takahashi, T. Tsuru, Y. Kaneda, T. Iwasaki, N. Hirata
  • Journal Title: Tectonophysics Vol. 472 Pages: 105-123
  • Peer Reviewed
• [Journal Article] Insight into complex rupturing of the immature bending normal fault in the outer slope of the Jaan Trench from aftershocks of the 2005 Sanriku earthquake(Mw=7.0)located by ocean bottom seismometry (2009)
  • Author(s): Ryota Hino, 他
  • Journal Title: Geochemistry Geophysics Geosystems 10
  • Peer Reviewed
• [Journal Article] Spatial heterogeneity of the mantle wedge structure and interplate coupling in the NE Japan forearc region (2008)
  • Author(s): Yamamoto, Y., R. Hino, K. Suzuki, Y. Ito, T. Yamada, M. Shinohara, T. Kanazawa, G. Aoki, M. Tanaka, K. Uehira, G. Fujie, Y. Kaneda, T. Takanami, T. Sato
  • Journal Title: Geophys.Res.Lett. Vol. 35
  • Peer Reviewed
• [Journal Article] Interactive analysis tools for the wide-angle seismic data for crustal structure study (2008)
  • Author(s): Fujie, G., J. Kasahara, K. Murase, K. Mochizuki, Y. Kaneda
  • Journal Title: Exploration Geophysics Vol. 39 Pages: 26-33
  • Peer Reviewed
• [Presentation] 中部東北日本前弧下に沈み込む太平洋スラブの地震波速度構造 (2009)
  • Author(s): 東龍介, 日野亮太, 伊藤喜宏, 鈴木健介
  • Organizer: 日本地震学会2009秋季大会
  • Place of Presentation: 京都市
  • Year and Date: 2009-10-21
• [Presentation] 人工地震波探査で推定した沈み込む太平洋プレートのP波・S波速度構造 (2009)
  • Author(s): 東龍介, 日野亮太, ほか10名
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2009-05-19
• [Presentation] Seismic velocity structure of subducting Pacific Ocean slab near Japantrench deduced by airgun-OBS surveys (2008)
  • Author(s): Azuma, R., R. Hino, et al.
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: 米国・サンフランシスコ
  • Year and Date: 2008-12-19
• [Presentation] 3D Seismic Velocity Structure along the southwestern Kuril Trench (2008)
  • Author(s): R. Hino, et al.
  • Organizer: ASC・SSJ合同大会
  • Place of Presentation: つくば市
  • Year and Date: 2008-11-27
• [Presentation] Ocean bottom seismographic study on the 2005 off-Sanriku intralate earthquake (M7.1) occurred in the outer rise of the Japan Trench (2007)
  • Author(s): R. Hino, et al.
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: 米国・サンフランシスコ市
  • Year and Date: 2007-12-11
• [Presentation] Ocean bottom seismographic study on the 2005 off-Sanriku intralate earthquake (M7.1) occurred in the outer rise of the Japan Trench (2007)
  • Author(s): R. Hino, et. al.
  • Organizer: American Geophysical Union
  • Place of Presentation: 米国・サンフランシスコ市
  • Year and Date: 2007-12-11
• [Presentation] 2005年に三陸沖 trench outer rise 域で発生したプレート内地震 (M7.1) の余震分布 (2007)
  • Author(s): 日野亮太・ほか8名
  • Organizer: 日本地震学会
  • Place of Presentation: 仙台市
  • Year and Date: 2007-10-24
• [Presentation] 2005年に三陸沖trench outer rise域で発生したプレート内地震(M7.1)の余震分布 (2007)
  • Author(s): 日野亮太・ほか8名
  • Organizer: 日本地震学会
  • Place of Presentation: 仙台市
  • Year and Date: 2007-10-24