Interaction between plate subduction and long inland strike-slip fault: Sumatran fault after the occurrence of a giant earthquake

• Project/Area Number: 17H04577
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Solid earth and planetary physics
• Research Institution: Kochi University
• Principal Investigator: TABEI Takao 高知大学, 教育研究部自然科学系理工学部門, 教授 (40207220)
• Co-Investigator(Kenkyū-buntansha): 木股 文昭 公益財団法人地震予知総合研究振興会, 東濃地震科学研究所, 副首席主任研究員 (10089849) ; 伊藤 武男 名古屋大学, 環境学研究科, 准教授 (40377982) ; 大久保 慎人 高知大学, 教育研究部自然科学系理工学部門, 准教授 (50462940) ; 堤 浩之 同志社大学, 理工学部, 教授 (60284428) ; 松多 信尚 岡山大学, 教育学研究科, 教授 (40578697)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000); Fiscal Year 2019: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2017: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
• Keywords: スマトラ断層 / プレート境界 / 地震 / 地殻変動 / GNSS / 変動地形 / 微動探査 / GPS / 地震災害・予測

Outline of Final Research Achievements

Sumatran fault in Sumatra island, Indonesia is the long inland strike-slip fault running parallel to the plate subduction boundary at the Sunda Trench. Reactivation of fault movement has been expected along the Sumatran fault because the 2004 Sumatra-Andaman giant earthquake caused regional stress increase on its fault plane. In this study we conducted dense GNSS observation, microtremor exploration and geomorphic field survey along two branch segments of the Sumatran fault near urban areas in Aceh Province, Sumatra. We estimate current locking/slip distribution on the fault plane and subsurface structure of the fault together with long-term fault slip history. These results will provide fundamental data for estimating earthquake generation potential in the near future.

Academic Significance and Societal Importance of the Research Achievements

プレート沈み込み境界で発生する巨大地震は広範囲の応力変化を引き起こし，内陸活断層の活動にも影響を及ぼす．プレート沈み込みと内陸直下型の地震活動の相互作用は，世界共通の問題である．日本では南海トラフ-中央構造線の関係が代表例である．本研究はインドネシア・スマトラ地方の中核都市周辺の地震発生ポテンシャル評価を目的としているが，ここで得られた知見は，他のプレート沈み込み境界域の内陸部における活動評価にも資する．

Research Products

• [Int'l Joint Research] Syiah Kuala University/Bandung Institute of Technology(Indonesia)
• [Journal Article] Coseismic Slip Distribution of the 2 July 2013 Mw 6.1 Aceh, Indonesia, Earthquake and Its Tectonic Implications (2018)
  • Author(s): Gunawan Endra、Widiyantoro Sri、Rosalia Shindy、Daryono Mudrik Rahmawan、Meilano Irwan、Supendi Pepen、Ito Takeo、Tabei Takao、Kimata Fumiaki、Ohta Yusaku、Ismail Nazli
  • Journal Title: Bulletin of the Seismological Society of America Volume: 108 Issue: 4 Pages: 1918-1928
  • DOI: 10.1785/0120180035
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Transient rheology of the oceanic asthenosphere following the 2012 Indian Ocean Earthquake inferred from geodetic data (2017)
  • Author(s): Cecep, P., T. Ito, R. Sasajima, T. Tabei, F. Kimata, E. Gunawan, Y. Ohta, T. Yamashina, N. Ismail, I. Nurdin, D. Sugiyanto, U, Muksin, and I. Meilano
  • Journal Title: Journal of Asian Earth Sciences Volume: 147 Pages: 50-59
  • DOI: 10.1016/j.jseaes.2017.07.049
  • NAID: 120006375878
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Active fault mapping and late Holocene activity of the northern Sumatran fault, Aceh province, Indonesia (2020)
  • Author(s): Yoshio Soeda, Hiroyuki Tsutsumi, Nobuhisa Matta, Nazli Ismail, Bukhari Ali
  • Organizer: HOKUDAN International Symposium on Active Faulting
  • Int'l Joint Research
• [Presentation] The kinematic model along the Sumatran fault using a new dense GNSS observation (AGNeSS+) in Banda Aceh (2019)
  • Author(s): 伊藤 武男, 田部井 隆雄, 木股 文昭, 大久保 慎人, 山品 匡史, Cecep Pratama, Didik Sugiyanto, Mukusin Umar, Nazli Ismail, Irwandi Nurdin
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] Microtremor array exploration in the Syiah Kuala University, Banda Aceh, Indonesia (2019)
  • Author(s): 大久保慎人
  • Organizer: 日本地球惑星科学連合2019年大会
  • Int'l Joint Research
• [Presentation] インドネシアバンダアチェ近郊におけるGNSS 観測に基づくブロック運動モデル (2019)
  • Author(s): 伊藤武男，木村 洋，田部井隆雄，大久保 慎人，山品匡史，木股文昭，Cecep Pratama, Agustan, Mukusin Umar，Nazli Ismail，Didik Sugiyanto，Irwan Nurdin
  • Organizer: 日本測地学会第132回講演会
• [Presentation] Exploration of the fault extension using SITES method; Aceh and Seulimeum segments of the Sumatran fault, Indonesia (2019)
  • Author(s): Tadashi Yamashina, Makoto Okubo, Takao Tabei, Umar Muksin, Nazli Ismail
  • Organizer: American Geophysical Union 2019 Fall meeting
  • Int'l Joint Research
• [Presentation] スマトラ断層北端部の断層変位地形と活動履歴 (2018)
  • Author(s): 堤 浩之・副田宜男・Nazli Ismail・Bukhari Ali
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Effect of 3-D heterogeneous-earth on rheology inference of postseismic model following the 2012 Indian Ocean earthquake (2017)
  • Author(s): Cecep, P., T. Ito, R. Sasajima, T. Tabei, F. Kimata, E. Gunawan, Y. Ohta, T. Yamashina, N. Ismail, U. Muksin, P. Maulida, I. Meilano, I. Nurdin, D. Sugiyanto, and J. Efendi
  • Organizer: American Geophysical Union 2017 Fall Meeting
  • Int'l Joint Research