Development of an analysis and observation method of active seismic surveys for understanding entities of large-earthquake asperities

• Project/Area Number: 20540408
• 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: The University of Tokyo
• Principal Investigator: MOCHIZUKI Kimihiro 東京大学, 地震研究所, 准教授 (80292861)
• Project Period (FY): 2008 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2011: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: アスペリティ / プレート境界 / 人工地震構造調査 / 反射強度 / 巨大地震 / 地震 / 人工地震調査 / 震源波形 / ニュージーランド / 速度構造 / 海洋性地殻 / 不均質構造

Research Abstract

The fault plane of repeating large subduction earthquakes is located where the mechanical coupling between the subducting and overriding plates is strong along the plate interface at depths more than 10 km deep beneath the seafloor. I developed a method to analyze waveform records obtained in marine active-source seismic surveys to understand factors that control the mechanical coupling along the plate interface. I successfully improve temporal resolution of the waveforms, and clearly identified arrivals of refracted waves and plate-interface reflected waves.

Research Products

• [Journal Article] Segmentation of the Vp/Vs ratio and low-frequency earthquake distribution around the fault boundary of the Tonankai and Nankai earthquakes (2013)
  • Author(s): Akuhara, T., K. Mochizuki, K. Nakahigashi, T. Yamada, M. Shinohara, S. Sakai, T. Kanazawa, K. Uehira and H. Shimizu
  • Journal Title: Geophys. Res. Lett. Volume: 40 Issue: 7 Pages: 1306-1310
  • DOI: 10.1002/grl.50223
  • Peer Reviewed
• [Journal Article] Seismic characteristics around the fault segment boundary of historical great earthquakes along the Nankai Trough revealed by repeated long-term OBS observations (2010)
  • Author(s): Mochizuki, K., K. Nakahigashi, A. Kuwano, T. Yamada, M. Shinohara, S. Sakai, T. Kanazawa, K. Uehira and H. Shimizu
  • Journal Title: Geophys. Res. Lett Volume: 37 Issue: 9
  • DOI: 10.1029/2010gl042935
  • Peer Reviewed
• [Journal Article] Seismic characteristics around the fault segment boundary of historical great earthquakes along the Nankai Trough revealed by repeated long-term OBS observations (2010)
  • Author(s): Mochizuki, K., K.Nakahigashi, A.Kuwano, T.Yamada, M.Shinohara, S.Sakai, T.Kanazawa, K.Uehira, H.Shimizu
  • Journal Title: Geophys. Res.Lett. 37
  • Peer Reviewed
• [Journal Article] Seismic characteristics around the fault segment boundary of historical great earthquakes along the Nankai Trough revealed by repeated long-term OBS observations (2010)
  • Author(s): K.Mochizuki, et al.
  • Journal Title: Geophysical Research Letters Volume: 37
  • Peer Reviewed
• [Journal Article] Weak interplate coupling by seamounts and repeating M~7 earthquakes (2008)
  • Author(s): Mochizuki, K., T. Yamada, M. Shinohara, Y. Yamanaka and T. Kanazawa
  • Journal Title: Science Volume: 321 Pages: 1194-1197
  • Peer Reviewed
• [Journal Article] Weak interplate coupling by seamounts and repeating M～7 earthquakes (2008)
  • Author(s): Mochizuki, K., T.Yamada, M.Shinohara, Y.Yamanaka, T.Kanazawa
  • Journal Title: Science 321 Pages: 1194-1197
  • Peer Reviewed
• [Journal Article] Weak Interplate Coupling by Seamounts and Repeating M〜7 Earthquakes (2008)
  • Author(s): K. Mochizuki
  • Journal Title: Science 321 Pages: 1194-1197
  • Peer Reviewed
• [Presentation] Wide-angle OBS velocity structure and gravity modeling along the SAHKE transect, lower North Island (2012)
  • Author(s): Mochizuki, K.
  • Organizer: New Zealand, American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2012-12-05
• [Presentation] ニュージーランド北島南部における海底地震計を用いたSAHKE人工震源構造調査測線下の地震波速度構造 (2012)
  • Author(s): 望月公廣
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ,千葉市
  • Year and Date: 2012-05-25
• [Presentation] ニュージーランド北島南部における海底地震計を用いたSAHKE人工震源構造調査測線下の地震波速度構造 (2012)
  • Author(s): 望月 公廣
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ、千葉市
• [Presentation] Wide-angle OBS velocity structure and gravity modeling along the SAHKE transect, lower North Island, New Zealand (2012)
  • Author(s): K. Mochizuki
  • Organizer: American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A
• [Presentation] Wide-angle OBS velocity structure along the SAHKE transect, lower North Island (2011)
  • Author(s): 望月公廣
  • Organizer: New Zealand, American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2011-12-05
• [Presentation] Wide-angle OBS velocity structure along the SAHKE transect, lower North Island, New Zealand (2011)
  • Author(s): 望月公廣
  • Organizer: 2012 AGU Fall Meeting
  • Place of Presentation: 米国サンフランシスコ(モスコーニセンター)
  • Year and Date: 2011-12-05
• [Presentation] ニュージーランド北島南方ヒクランギ沈み込み帯固着領域内SAHKE構造調査測線における地震波速度構造 (2011)
  • Author(s): 望月公廣
  • Organizer: 日本地震学会
  • Place of Presentation: コンベンションアーツセンター・グランシップ,静岡市
  • Year and Date: 2011-10-12
• [Presentation] ニュージーランド北島南方ヒクランギ沈み込み帯固着領域内SAHKE構造調査測線における地震波速度構造 (2011)
  • Author(s): 望月公廣
  • Organizer: 日本地震学会秋季大会
  • Place of Presentation: 静岡県静岡市(コンベンションアーツセンター・グランシップ)
  • Year and Date: 2011-10-12
• [Presentation] 紀伊半島西方におけるフィリピン海プレートの沈み込みに関する海陸統合構造調査 (2011)
  • Author(s): 望月公廣
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ,千葉市
  • Year and Date: 2011-05-25
• [Presentation] 紀伊半島西方におけるフィリピン海プレートの沈み込みに関する海陸統合構造調査 (2011)
  • Author(s): 望月公廣
  • Organizer: 日本地球惑星科学連合2011年度連合大会
  • Place of Presentation: 千葉県千葉市(幕張メッセ国際会議場)
  • Year and Date: 2011-05-25
• [Presentation] Offshore seismic survey and observation using OBSs across the locked southern Hikurangi margin (2010)
  • Author(s): Mochizuki, K.
  • Organizer: New Zealand, American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2010-12-17
• [Presentation] Offshore seismic survey and observation using OBSs across the locked southern Hikurangi margin, New Zealand (2010)
  • Author(s): K.Mochizuki, 他6名
  • Organizer: American Geophysical Union 2010 Fall Meeting
  • Place of Presentation: San Francisco (U.S.A)
  • Year and Date: 2010-12-17
• [Presentation] Offshore seismic survey and observation using OBSs across the locked southern Hikurangi margin, New Zealand (2010)
  • Author(s): K.Mochizuki, et al.
  • Organizer: American Geophysical Union
  • Place of Presentation: San Francisco (U.S.A)
  • Year and Date: 2010-12-17
• [Presentation] 長期海底地震観測と陸上定常観測の統合後モグラフィー解析による東南海・南海地震震源境界域における地震活動と地震波速度構造 (2010)
  • Author(s): 望月公廣
  • Organizer: 日本地震学会
  • Place of Presentation: 広島国際会議場,広島市
  • Year and Date: 2010-10-28
• [Presentation] 長期海底地震観測と陸上定常観測の統合トモグラフィー解析による東南海・南海地震震源境界域における地震活動と地震波速度構造 (2010)
  • Author(s): K.Mochizuki, 他7名
  • Organizer: 日本地震学会
  • Place of Presentation: 広島国際会議場(広島県)
  • Year and Date: 2010-10-28
• [Presentation] 東南海・南海巨大地震断層境界周辺の地殻構造と地震活動のセグメンテーション (2010)
  • Author(s): 望月公廣
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ,千葉市
  • Year and Date: 2010-05-24
• [Presentation] 東南海・南海巨大地震断層境界周辺の地殻構造と地震活動のセグメンテーション (2010)
  • Author(s): K.Mochizuki, 他8名
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2010-05-24
• [Presentation] 東南海・南海巨大地震断層境界周辺の地殻構造と地震活動のセグメンテーション (2010)
  • Author(s): 望月公廣, 他
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2010-05-24
• [Presentation] Seismicity and velocity structure around the fault boundary region of the great earthquakes along the Nankai Trough revealed by repeating long-term OBS observations (2009)
  • Author(s): Mochizuki, K.
  • Organizer: American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2009-12-16
• [Presentation] 繰り返し長期海底地震観測による東南海・南海地震震源域における地震活動と地震波速度構造 (2009)
  • Author(s): 望月公廣
  • Organizer: 日本地震学会
  • Place of Presentation: 京都大学,京都市
  • Year and Date: 2009-10-23
• [Presentation] 繰り返し長期海底地震観測による東南海・南海地震震源域における地震活動と地震波速度構造 (2009)
  • Author(s): K.Mochizuki, 他9名
  • Organizer: 日本地震学会
  • Place of Presentation: 京都大学(京都府)
  • Year and Date: 2009-10-23
• [Presentation] Spatially varying seismicity distribution in the Tonankai-Nankai regions revealed by repeating long-term ocean bottom observations (2009)
  • Author(s): 望月公廣
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ, 千葉市
  • Year and Date: 2009-05-21
• [Presentation] Spatially varying seismicity distribution in the Tonankai-Nankai regions revealed by repeating long-term ocean bottom observations (2009)
  • Author(s): K.Mochizuki, 他12名
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2009-05-21
• [Presentation] Weak Interplate Coupling Induced by Seamount Subduction; Involvement of Fluid Migration inDetermining Seismogenic Character (2008)
  • Author(s): Mochizuki, K.
  • Organizer: American Geophysical Union
  • Place of Presentation: San Francisco, U.S.A.
  • Year and Date: 2008-12-08
• [Presentation] Weak Interplate Coupling Induced by Seamount Subduction ; Involvement of Fluid Migration in Determining Seismogenic Character, American Geophysical Union (2008)
  • Author(s): K.Mochizuki, 他8名
  • Organizer: 2008 Fall Meeting
  • Place of Presentation: San Francisco (U.S.A)
  • Year and Date: 2008-12-08
• [Presentation] Weak Interplate Coupling Induced by Seamount Subduction; Involvement of Fluid Migration in Determining Seismogenic Character (2008)
  • Author(s): K. Mochizuki
  • Organizer: American Geophysical Union, 2008 Fall Meeting
  • Place of Presentation: San Francisco