Sumatran Fault after the giant Sumatra earthquake - Temporal decay of postseismic deformation and initiation of a new strain accumulation process

• Project/Area Number: 24403005
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• 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学部門, 教授 (40207220)
• Co-Investigator(Kenkyū-buntansha): KIMATA Fumiaki 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, 副主席研究員 (10089849) ; ITO Takeo 名古屋大学, 環境学研究科, 講師 (40377982) ; OHTA Yusaku 東北大学, 理学研究科, 准教授 (50451513) ; TSUTSUMI Hiroyuki 京都大学, 理学研究科, 准教授 (60284428) ; 久保 篤規 高知大学, 教育研究部自然科学系, 准教授 (60403870)
• Research Collaborator: ISMAIL Nazli シアクアラ大学 ; NURDIN Irwandi シアクアラ大学 ; SUGIYANTO Didik シアクアラ大学 ; MEILANO Irwan バンドン工科大学 ; GUNAWAN Endra バンドン工科大学
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2015: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2014: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2013: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2012: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
• Keywords: スマトラ断層 / プレート境界 / GPS / 地殻変動 / インドネシア / 変動地形 / プレート沈み込み

Outline of Final Research Achievements

We have conducted continuous and intermittent GPS observations in Aceh province, northern Sumatra, Indonesia to monitor temporal decay of the postseismic deformation after the 2004 giant Sumatra earthquake. In addition we have carried out geodetic and geomorphic studies to evaluate earthquake generation potential of the Sumatran fault that is the arc-parallel strike-slip fault system in the overriding plate. GPS observations, interferometric analysis of synthetic aperture radar images, mapping of active faults from satellite stereo images, geomorphic field research, fault creep measurements, and trench excavation have been conducted to estimate slip pattern of the Sumatran fault in a wide range of time scale.

Research Products

• [Int'l Joint Research] シアクアラ大学/バンドン工科大学(インドネシア)
• [Journal Article] Co-seismic offsets due to two earthquakes (Mw 6.1) along the Sumatran fault system derived from GNSS measurements (2016)
  • Author(s): Ito,T., Gunawan, E., Kimata, F., Tabei, T., Meilano, I., Agustan, Ohta, Y., Ismail, N., Nurdin I., Sugiyanto, D.
  • Journal Title: Earth, Planets and Space Volume: 68 Issue: 1 Pages: 1-8
  • DOI: 10.1186/s40623-016-0427-z
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Geodetic and geomorphic evaluations of earthquake potential of the northern Sumatran fault, Indonesia (2015)
  • Author(s): Tabei, T., Kimata, F., Ito, T., Gunawan, E., Tsutsumi, H., Ohta, Y., Yamashina, T., Soeda, Y., Ismail, N., Nurdin, I., Sugiyanto, D., Meliano. I.
  • Journal Title: International Association of Geodesy Symposia Volume: 145 Pages: 1-8
  • DOI: 10.1007/1345_2015_200
  • ISBN: 9783319397672, 9783319397689
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A comprehensive model of postseismic deformation of the 2004 Sumatra-Andaman earthquake deduced from GPS observations in northern Sumatra (2014)
  • Author(s): Gunawan, E., T. Sagiya, T. Ito, F. KImata, T. Tabei, Y. Ohta, I. Meilano, H. Z. Abidin, Agustan, I. Nurdin, and D. Sugiyanto
  • Journal Title: Journal of Asian Earth Sciences Volume: 88 Pages: 218-229
  • DOI: 10.1016/j.jseaes.2014.03.016
  • Peer Reviewed
• [Journal Article] Isolating along-strike variations in the depth extent of shallow creep and fault locking on the northern Great Sumatran Fault (2012)
  • Author(s): T. Ito, E. Gunawan, F. Kimata, T. Tabei, M. Simons, I. Meilano, Agustan, Y. Ohta, I. Nurdin, D. Sugiyanto
  • Journal Title: J. Geophys. Res. Volume: 117 Issue: B6
  • DOI: 10.1029/2011jb008940
  • Peer Reviewed
• [Presentation] スマトラ断層北端部の変位地形・活動履歴・クリープ変位 (2015)
  • Author(s): 堤 浩之，副田宜男，Ismail, N., 田部井隆雄
  • Organizer: 日本地質学会
  • Place of Presentation: 長野市
  • Year and Date: 2015-09-12
• [Presentation] New insights into recent activity of the northern Sumatran fault, Indonesia from geodetic and geomorphic observations (2014)
  • Author(s): Tabei, T., F. Kimata, T. Ito, H. Tsutsumi, Y. Ohta, E. Gunawan, T. Yamashina, N. Ismail, I. Nurdin, D. Sugiyanto, I. Meilano
  • Organizer: Asian Seismological Commission 10th General Assembly
  • Place of Presentation: マニラ市，フィリピン
  • Year and Date: 2014-11-18
• [Presentation] Geodetic and geomorphic evaluations of earthquake generation potential of the northern Sumatran fault, Indonesia (2014)
  • Author(s): Tabei, T., F. Kimata, T. Ito, E. Gunawan, H. Tsutsumi, Y. Ohta, T. Yamashina, Y. Soeda, N. Ismail, I. Nurdin, D. Sugiyanto, I. Meilano
  • Organizer: International Symposium on Geodesy for Earthquake and Natural Hazards
  • Place of Presentation: 松島，宮城
  • Year and Date: 2014-07-23
• [Presentation] GPS観測網(AGNeSS)によるスマトラ断層固着の空間変化 (2012)
  • Author(s): 伊藤武男, E. Gunawan,木股文昭, 田部井隆雄, 太田雄策, 他3名
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2012-05-20
• [Presentation] Crustal deformation detected by GPS observation network across the Sumatran fault system in northwestern Sumatra, Indonesia
  • Author(s): Tabei, T., T. Ito, F. Kimata, Y. Ohta, E. Gunawan, N. Ismail, D. Sugiyanto, and I. Nurdin
  • Organizer: American Geophysical Union 2013 Fall Meeting
  • Place of Presentation: モスコーンコンベンションセンター（サンフランシスコ市，アメリカ合衆国）