Research on earthquake Cycle based on the analysis of interplate repeating earthquakes

• Project/Area Number: 19740264
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University
• Principal Investigator: UCHIDA Naoki Tohoku University, 大学院・理学研究科, 助教 (80374908)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥1,150,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥150,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥500,000 (Direct Cost: ¥500,000)
• Keywords: 地震現象 / 小繰り返し地震 / 地震サイクル / プレート境界地震 / 相似地震 / 準静的すべり / アスペリティ / 固有地震

Research Abstract

小繰り返し地震を用い,地震サイクルの物理過程を理解するため,岩手県釜石沖等の繰り返し地震について震源決定,断層サイズ,応力降下量の推定を行った.その結果,釜石沖の地震クラスタでは,断層上の比較的弱いパッチで小地震が発生し,インターサイスミックな期間の,すべり域内で非地震的すべりが明らかになった.また,他の繰り返し地震では,外部からの影響(余効すべり等)により発生間隔だけでなく,規模や破壊過程も変化することも分かった.

Research Products

• [Journal Article] What controls interplate coupling? : Evidence for abrupt change in coupling across a border between two overlying plates in the NE Japan subduction zone (2009)
  • Author(s): Uchida, N., J. Nakajima, A. Hasegawa, and T. Matsuzawa
  • Journal Title: Earth Planet. Sci. Lett. (in press)
  • Peer Reviewed
• [Journal Article] Quasi-static slip on the plate boundary associated with the 2003 M8.0 Tokachi-oki and 2004 M7.1 off-Kushiro earthquakes (2009)
  • Author(s): Uchida, N., S. Yui, S. Miura, T. Matsuzawa, A. Hasegawa, Y. Motoya, and M. Kasahara
  • Journal Title: Gondwana Research (in press)
  • Peer Reviewed
• [Journal Article] Plate subduction, and generation of earthquakes and magmas in Japan as inferred from seismic observations : An overview (2009)
  • Author(s): Hasegawa, A., J. Nakajima, N. Uchida, T. Okada, D. Zhao, T. Matsuzawa, and N. Umino
  • Journal Title: Gondwana Research (in press)
  • Peer Reviewed
• [Journal Article] プレート境界地震に伴う余効すべりと岩石の粘弾性挙動 (2009)
  • Author(s): 川田祐介・長濱裕幸・内田直希・松澤暢
  • Journal Title: 地質学雑誌 (印刷中)
  • NAID: 130000254072
  • Peer Reviewed
• [Journal Article] What controls interplate coupling? : Evidence for abrupt change in coupling across a border between two overlying plates in the NE Japan subduction zone (2009)
  • Author(s): Uchida, N., J. Nakajima, A. Has egawa, and T. Matsuzawa
  • Journal Title: Earth Planet. Sci. Lett (印刷中)
  • Peer Reviewed
• [Journal Article] Quasi-static slip on the plate boundary associated with the 2003 M8.0Tokachi-oki and 2004 M7.1 off-Kushiro earthquakes (2009)
  • Author(s): Uchida, N., S. Yui, S. Miura, T. Matsuzawa, A. Hasegawa Y. M otoya, and M. Kasahara
  • Journal Title: Gondwana Res (印刷中)
  • Peer Reviewed
• [Journal Article] Rescaled earthquake recurrence time statistics : application to microrepeaters (2008)
  • Author(s): Goltz, C., D. L. Turcotte, S. G. Abaimov, R. M. Nadeau, N. Uchida, and T. Matsuzawa
  • Journal Title: Gophys. J. Int. 176(1) Pages: 256-264
  • Peer Reviewed
• [Journal Article] 釜石沖の規則的な地震活動とアスペリティ・モデル (2008)
  • Author(s): 松澤暢・内田直希
  • Journal Title: なゐふる 67 Pages: 4-5
• [Journal Article] Rescaled earthquake recurrence time statistics : application to microrepeaters (2008)
  • Author(s): Goltz, C., D. L. Turcotte, S. G. Abaimov, R. M. Nadeau, N. Uchida, and T. Matsuzawa
  • Journal Title: Gophys. J. Int 176 Pages: 256-264
  • Peer Reviewed
• [Journal Article] Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan - implications for the hierarchical structure of asperities and earthquake cycle (2007)
  • Author(s): Uchida, N., T. Matsuzawa, W. L. Ellsworth, K. Imanishi, T. Okada, and A. Hasegawa
  • Journal Title: Geophys. Res. Lett. 34
  • Peer Reviewed
• [Journal Article] 小繰り返し地震解析による宮城・福島県沖プレート境界の準静的すべり (2007)
  • Author(s): 内田直希・松澤暢・三浦哲・平原聡・長谷川昭
  • Journal Title: 地震 2 59,4 Pages: 287-295
  • NAID: 10020152281
  • Peer Reviewed
• [Journal Article] Seismic velocity reductions caused by the 2003 Tokachi-oki earthquake (2007)
  • Author(s): Rubinstein, J., N. Uchida, and G. Beroza
  • Journal Title: J. Geophys. Res. 112
  • Peer Reviewed
• [Journal Article] 地震長期発生確率予測に使用する更新過程対数正規分布モデルのパラメータ事前分布 (2007)
  • Author(s): 岡田正実・高山博之・弘瀬冬樹・内田直希
  • Journal Title: 地震 2 60,2 Pages: 85-100
  • NAID: 10019780553
  • Peer Reviewed
• [Journal Article] 1930年代に発生したM7クラスの宮城県沖地震の震源再決定-1978年宮城県沖地震のアスペリティでのすべりだったのか?- (2007)
  • Author(s): 海野徳仁・河野俊夫・岡田知己・中島淳一・松澤暢・内田直希・長谷川昭・田村良明・青木元
  • Journal Title: 地震 2 59 Pages: 325-337
  • NAID: 10020152386
  • Peer Reviewed
• [Journal Article] 小繰り返し地震による東北日本沈み込みプレート境界での準静的すべりの推定 (2007)
  • Author(s): 内田直希・松澤暢・平原聡・長谷川昭・笠原稔
  • Journal Title: 月刊地球 29,6 Pages: 383-391
• [Journal Article] Source parameters of a M4.8 and its accompanying repeating earthquakes off Kamaishi, NE Japan-implications for the hierarchical structure of asperities and earthquake cycle (2007)
  • Author(s): Uchida, N., T, Matsuzawa, W. L. Ellsworth, K. Imanishi, T. Okada, and A. Hasegawa
  • Journal Title: Geophys. Res. Lett. 34
  • Peer Reviewed
• [Journal Article] Asperities and quasi-static slips on the subducting plate boundary east off Tohoku, NE Japan (2007)
  • Author(s): Hasegawa, A., N. Uchida, T. Igarashi, T. Matsuzawa, T. Okada, S. Miura, and Y. Suwa
  • Journal Title: The seismogenic zone of subduction thrust faults, Margins Theoretical Institute and Experimental Earth Science Series Pages: 451-475
• [Presentation] 2008年の繰り返し釜石沖地震とその周辺の地震活動 (2008)
  • Author(s): 内田直希・松澤暢・岡田知己・島村浩平・長谷川昭・今西和俊・Ellsworth WilIiam L
  • Organizer: 日本地球惑星科学連合2008年大会
  • Place of Presentation: 千葉, 幕張メッセ
  • Year and Date: 2008-05-30
• [Presentation] 変換波推定される関東地方のフィリピン海プレートの上面深度と厚さ (2008)
  • Author(s): 内田直希・松澤暢・中島淳一・長谷川昭・弘瀬冬樹
  • Organizer: 地震研特定B関東テクトニクス研究集会
  • Place of Presentation: 東京,東京大学地震研究所
  • Year and Date: 2008-03-19
• [Presentation] What controls interplate coupling? Tmplications from abrupt change in coupling on the Pacific plate across a border between two overlying plates in the southernmost extent of the NE Japan subduction zone (2008)
  • Author(s): Uchida, N., A. Hasegawa, J. Nakajima, and T. Matsuzawa
  • Organizer: AGU 2008 Fall meeting
  • Place of Presentation: San Francisco, Moscone Center
• [Presentation] Abrupt change in interplate coupling on the Pacific plate across a border of two overlying plates east off Kanto, Japan (2008)
  • Author(s): Uchida, N., J. Nakajima, A. Hasegawa, and T. Matsuzawa
  • Organizer: ASC・SSJ合同大会
  • Place of Presentation: つくば市,つくば国際会議場
• [Presentation] Afterslip of the 2008 off Ibaraki (M7.0) and off Fukushima (M6.9) earthquakes estimated from small repeating earthquakes (2008)
  • Author(s): Uchida, N., M. Mishina, and T. Matsuzawa
  • Organizer: ASC・SSJ合同大会
  • Place of Presentation: つくば市,つくば国際会議場
• [Presentation] プレート間カップリングは何により規定されるか? : 上盤プレートが支配する関東沖の太平洋プレート上面のカップリング (2008)
  • Author(s): 内田直希・中島淳一・長谷川昭・松澤暢
  • Organizer: アスペリティのマッピングとモニタリング(EARS)シンポジウム2008年度研究集会
  • Place of Presentation: 東京,東京大学地震研究所
• [Presentation] Subduction of Izu-Bonin forearc 'wedge' and its effect on interplate coupling around Kanto, Japan (2008)
  • Author(s): Uchida, N., T. Matsuzawa, J. Nakajima, A. Hasegawa, and F. Hirose
  • Organizer: 7th International Seminar on Seismic Tomography of Far-East-Asia and related works
  • Place of Presentation: Daejeon, Korea Institute of Geoscience and Mineral Resources
• [Presentation] 東北日本三陸沖の太平洋スラブ直上の地震活動 (2008)
  • Author(s): 内田直希・Kirby Stephen・岡田知己・北佐枝子・辻優介・山本揚二朗・Shantha S. N. Gamage・日野亮太・松澤暢・長谷川昭
  • Organizer: 日本地球惑星科学連合2008年大会
  • Place of Presentation: 千葉,幕張メッセ
• [Presentation] 2008年の繰り返し釜石沖地震とその周辺の地震活動 (2008)
  • Author(s): 内田直希・松澤暢・岡田知己・島村浩平・長谷川昭・今西和俊・Ellsworth William L.
  • Organizer: 日本地球惑星科学連合2008年大会
  • Place of Presentation: 千葉,幕張メッセ
• [Presentation] 宮城県沖地震の発生過程の解明 (2008)
  • Author(s): 内田直希
  • Organizer: 地震・火山噴火予知研究計画シンポジウム
  • Place of Presentation: 東京,東京大学地震研究所
• [Presentation] 小繰り返し地震によるプレート境界の地震活動の理解 (2007)
  • Author(s): 内田直希・松澤暢・長谷川昭
  • Organizer: 地震活動のモデルと予測に関する研究 統計数理研究所 共同研究集会
  • Place of Presentation: 東京,統計数理研究所
  • Year and Date: 2007-11-09
• [Presentation] Configuration of the Philippine Sea plate in the Kanto district, Japan, estimated from SP and PS converted waves (2007)
  • Author(s): Uchida, N., T. Matsuzawa, J. Nakajima, A. Hasegawa, and F. Hirose
  • Organizer: AGU 2007 Fall Meeting
  • Place of Presentation: San Francisco, Moscone South
• [Presentation] 変換波を用いた関東地方のフィリピン海プレートの形状推定 (2007)
  • Author(s): 内田直希・松澤暢・中島淳一・長谷川昭・弘瀬冬樹
  • Organizer: 「アスペリティのマッピングとモニタリング(EARS)」シンポジウム
  • Place of Presentation: 東京,東京大学地震研究所
• [Presentation] 小繰り返し地震によるプレート境界の地震活動の理解 (2007)
  • Author(s): 内田直希・松澤暢・長谷川昭
  • Organizer: 地震活動のモデルと予測に関する研究 統計数理研究所 共同研究集会 19-共研-5002
  • Place of Presentation: 東京,統計数理研究所 講堂
• [Presentation] 小繰り返し地震からの変換波による関東地方のフィリピン海プレートの形状推定 (2007)
  • Author(s): 内田直希・松澤暢・中島淳一・長谷川昭・弘瀬冬樹
  • Organizer: 日本地震学会2007年秋季大会
  • Place of Presentation: 仙台,仙台国際センター
• [Presentation] Quasi-static slip associated with large earthquakes on the subducting plate boundary of NE Japan detected by small repeating arthquake analysis (2007)
  • Author(s): Uchida, N., T. Matsuzawa, and A. Hasegawa
  • Organizer: EASTEC symposium 2007 Dynamic Earth -its origin and future-
  • Place of Presentation: Sendai, Sendai City War Reconstruction Memorial Hall
• [Presentation] 小繰り返し地震による東北日本プレート境界の準静的すべりの ッピングとモニタリング (2007)
  • Author(s): 内田直希・松澤暢・平原聡・五十嵐俊博・長谷川昭
  • Organizer: 日本地球惑星科学連合2007年大会
  • Place of Presentation: 千葉,幕張メッセ
• [Book] Asperities and quasi-static slips on the subducting plate boundary east off Tohoku, NE Japan, The seismogenic zone of subduction thrust faults, Margins Theoretical Institute and Experimental Earth Science Series (2007)
  • Author(s): Hasegawa, A., N. Uchida, T. Igarashi, T. Matsuzawa, T. Okada, S. Miura, and Y. Suwa
  • Publisher: Columbia University Press, New York
• [Remarks]
  • URL: http://www.aob.geophys.tohoku.ac.jpruchida/
• [Remarks]
  • URL: http://www.aob.geophys.tohoku.ac.jp/info/topics/20080111_news/index_html