Research on reintegration process of 2004 Sumatra Earthquake and strain accumulation process in the Sumatran Fault in North Sumatra

2010 Fiscal Year Final Research Report

• Project/Area Number: 19253003
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Solid earth and planetary physics
• Research Institution: Nagoya University
• Principal Investigator: KIMATA Fumiaki Nagoya University, 環境学研究科, 教授 (10089849)
• Co-Investigator(Kenkyū-buntansha): ITO Takeo 名古屋大学, 大学院・環境学研究科, 助教 (40377982) ; TABEI Takeo 高知大学, 理学部, 教授 (40207220) ; OGAWA Yasuo 東京工業大学, 火山流体研究センター, 教授 (10334525)
• Project Period (FY): 2007 – 2010
• Keywords: 2004年スマトラ地震 / スマトラ断層 / 地殻変動 / 断層モデル / 地震時の地殻変動 / 余効変動 / ひずみ蓄積 / クリープ運動 / GPS観測 / MT観測

Research Abstract

GPS measurements have been observed two times every year at the in north Sumatra since 2007, and MT observations closing the fault. Through the surveys, co-seismic deformation over 3 m and post-seismic deformation over 80 cm horizontally and 50 cm vertically are observed.
We discuss the fault slip model of the 2004 Sumatra Earthquake, largest slip over 20 m is estimated in upper thrust fault extending to ocean bottom from the plate boundary. This estimation shows a good consistent with 1 m uplift in Nias Island.
From a post-seismic deformation especially uplift of 50 cm in the west coast of Banda Aceh, it is suggested large after slip would be occurred in the deeper plate boundary.
We also discuss the fault slip model of the Sumatra fault based on the horizontal deformation deduced the post-seismic deformation from the observed deformation by mode. The creep dislocation of 3 cm/yr in the shallow part of the fault in north Aceh is suggested. Low risibility zones around the fault are detected by MT survey. It also suggested that earthquake occurrence potential is enhanced high in north Sumatra.

Research Products

• [Journal Article] Ground deforma- tion detected by AGNeSS in North Sumatra after the 20004 Sumatra-Andaman earth- quake, no review (2010)
  • Author(s): Endra G., T.Ito, F.Kimata, T.Sagiya, T.Tabei, Didik, Irwandi, M. Irwan
  • Journal Title: The 6th Investigation Report of the 2004 Northern Sumatra Earthquake, Nagoya Univ Pages: 112-121
• [Journal Article] スマトラ島北西部のスマトラ断層における地震発生ポテンシャル (2010)
  • Author(s): 2)伊藤武男,Gunawan,木股文昭,田部井隆雄, Irwandi, Agstan,Irwan Meilano, Mark Simons
  • Journal Title: 名古屋大学環境学研究科2004年北部スマトラ地震調査報告VI Pages: 107-111
• [Journal Article] 2004年スマトラ地震津波から4年間のGPS観測で見えてきた地震余効変動とスマトラ断層での歪み場 (2009)
  • Author(s): 木股文昭,伊藤武男,E,Gunawan, Agustan, 田部井隆雄, Irwandi, M.Irwan
  • Journal Title: 名古屋大学環境学研究科2004年北部スマトラ地震調査報告V Pages: 103-108
• [Journal Article] 2004年スマトラ・アンダマン地震津波から3年:地震学としての課題と展望 (2008)
  • Author(s): 木股文昭
  • Journal Title: 2004年北部スマトラ地震調査報告IV,名古屋大学環境学研究科 Pages: 3-6
• [Journal Article] The construction of new dense GPS observation network: AGNeSS (Aceh GPS Network for Sumatran Fault System, no review (2008)
  • Author(s): Ito T., Agustan, I.Meirano, T.Tabei, F.Kimata
  • Journal Title: The 4 th Investigation Report of 2004 Northern Sumatra Earthquake, Graduate School of Environmental Studies, Nagoya University Pages: 83-88
• [Journal Article] インドネシア国スマトラにおけるGPS観測のための予備調査-スマトラのGPS観測による2004年アチェ・アンダマン地震の滑り分布の推定- (2007)
  • Author(s): 木股文昭,伊藤武男,太田雄策,I. Meilano,田部井隆雄
  • Journal Title: 防災科学技術研究所資料 304 Pages: 57-68
• [Journal Article] The construction of new dense GPS observation network: AGNeSS (Aceh GPS Network for Sumatran Fault System), no review, no review (2007)
  • Author(s): T.Ito, Agustan, I. Meilano, T.Tabei, F.Kimata
  • Journal Title: The 4th Investigation Report of 2004 Northern Sumatra Earthquakes, Graduate School of Environmental Studies, Nagoya University Pages: 83-88
• [Journal Article] スマトラアンダマン地震の地震測地学的な側面からの知見, 地震余効変動とスマトラ断層での歪み場 (2007)
  • Author(s): 伊藤武男,太田雄策,I. Meilano,木股文昭
  • Journal Title: 名古屋大学環境学研究科2004年北部スマトラ地震調査報告3号,名古屋大学 Pages: 11-14
• [Journal Article] Two Years GPS Observation in Aceh, no review, The 3rd Investigation Report of 2004 Northern Sumatra Earthquakes, (2007)
  • Author(s): Meilano,I., Y. Ohta, F.Kimata, T.Ito, T.Tabei, et al.
  • Journal Title: Graduate School of Environmental Studies, no review, Nagoya University Pages: 7-10
• [Journal Article] インドネシア国スマトラにおけるGPS観測のための予備調査 -スマトラのGPS観測による2004年アチェ・アンダマン地震の滑り分布の推定- (2007)
  • Author(s): 木股文昭・伊藤武男・太田雄策・メイラノイルワン・田部井隆雄
  • Journal Title: 防災科学技術研究所研究資料 304 Pages: 57-67
• [Journal Article] アチェ山中における2004年スマトラ地震津波後の変化
  • Author(s): 木股文昭
  • Journal Title: 2004年北部スマトラ地震調査報告IV,名古屋大学環境学研究科 Pages: 89-92T
• [Presentation] 錦におけるオンサイト型津波避難システムとその歴史・科学的背景 (2008)
  • Author(s): 木股文昭・田中重好・高橋誠
  • Organizer: 第25回歴史地震研究会発表会
  • Year and Date: 20080000
• [Presentation] Viscoelastic Model of 2004 Sumatra- Andaman Earthquake observed from near (AGNeSS) and far field GPS measurements
  • Author(s): Gunawan E., T. Sagiya, T.Ito, F.Kimata, et al.
  • Organizer: 2011 JpGU meeting, SSS029-08
• [Presentation] Seismic potential on the Sumatran fault using GPS observation
  • Author(s): Ito T., Gunuwan, E., Kimata F., et al.
  • Organizer: AGU 2010 Meeting, G43A-0822
• [Presentation] Ground Deformation Along the Sumatran Fault in Aceh, Sumatra, detect by AGNeSS GPS Network (Preliminary result)
  • Author(s): Gunawan E., T.Ito, Agustan, F.Kimata, T.Tabei, M.Irwan
  • Organizer: 2009 JpGU Meeting, D108-P018
• [Presentation] Ground deformation along the Sumatra Fault by AGNeSS in Sumatra
  • Author(s): Gunuwan,e., T.Ito, Agustan, F.Kimata, T.Tabei, H.Z.Abidin, I.Meilano, et al.
  • Organizer: Indonesia 7th General Assembly of Asian Seismological Commission and Seismological Society of Japan, 2008 Fall meeting
• [Presentation] スマトラのGPS観測から推定する2004年スマトラ・アンダマン地震スマトラセグメントの滑り分布
  • Author(s): 木股文昭・M. Irwan ・伊藤武男 ・Agustan・ 太田雄策 ・田部井隆雄 ・D. Sugiyanto
  • Organizer: 2008年地球惑星科学合同大会,T228-002
• [Remarks] ホームページ等