Afterslip distribution of large earthquakes with viscoelastic and poroelastic responses

• Project/Area Number: 20540404
• 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: Chiba University
• Principal Investigator: SATO Toshinori Chiba University, 大学院・理学研究科, 教授 (70222015)
• Co-Investigator(Renkei-kenkyūsha): FUKAHATA Yukitoshi 京都大学, 防災研究所, 准教授 (10313206)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 地震 / 地球変動予測 / 地殻変動 / 地震発生過程 / 粘性緩和 / 間隙弾性

Research Abstract

We developed a new method for estimation of afterslip distribution with viscoelastic and poroelastic responses. We consider viscoelastic responses not only due to coseismic slip but also due to afterslip in the preceding intervals. Poroelastic responses are included in the model as difference between drain-undrain responses. Results of application to two earthquakes show that large different slip distributions are obtained between our new model and elastic only model. This means that viscoelasic and poroelasic responses are needed for analysis of afterslip distribution.

Research Products

• [Journal Article] Modeling afterslip distribution with elastic, poroelastic and viscoelastic responses investigated from Global Positioning System (GPS) observations (2011)
  • Author(s): Ashar Muda Lubis
  • Journal Title: 千葉大学大学院理学研究科博士論文(指導教員:佐藤利典)
• [Journal Article] Modeling afterslip distribution with elastic, poroelastic and viscoelastic responses investigated from Global Positioning System(GPS)observations (2011)
  • Author(s): Ashar Muda Lubis
  • Journal Title: 千葉大学大学院理学研究科博士論文(指導教員:佐藤利典) Pages: 265-265
• [Journal Article] 粘弾性を考慮した2003年十勝沖地震の余効すべり分布と2004年釧路沖地震の関係 (2010)
  • Author(s): 竹村英紀
  • Journal Title: 千葉大学理学部地球科学科卒業論文(指導教員:佐藤利典)
• [Journal Article] 粘弾性を考慮した2003年十勝沖地震の余効すべり分布と2004年釧路沖地震の関係 (2010)
  • Author(s): 竹村英紀
  • Journal Title: 千葉大学理学部地球科学科卒業論文 Pages: 1-69
• [Journal Article] 粘弾性を考慮した巨大地震の余効すべり分布の解明 (2008)
  • Author(s): 樋口春隆
  • Journal Title: 千葉大学自然科学研究科修士論文(指導教員:佐藤利典)
• [Journal Article] 粘弾性を考慮した巨大地震の余効すべり分布の解明 (2008)
  • Author(s): 樋口春隆
  • Journal Title: 千葉大学自然科学研究科修士論文 Pages: 35-35
• [Presentation] Relationship between Afterslip of 2003 Tokachi Earthquakes and Coseismic-slip of 2004 Kushiro Earthquakes Using Viscoelastic Media (2010)
  • Author(s): Toshinori Sato, Hidenori Takemura
  • Organizer: American Geophysical Union, Fall Meeting 2010
  • Place of Presentation: San Francisco, USA
• [Presentation] 粘弾性を考慮した2003年十勝沖地震の余効すべり分布と2004年釧路沖地震との関係 (2010)
  • Author(s): 竹村英紀、佐藤利典
  • Organizer: 日本地震学会2010年度秋季大会
  • Place of Presentation: 広島
• [Presentation] Afterslip distribution and viscoelastic relaxation following the 2007 Bengkulu earthquake series from GPS (2010)
  • Author(s): Lubis A.M., Hashima A., Sato, T
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 千葉
• [Presentation] Afterslip distribution corrected by the viscoelastic relaxation following the September 12, 2007 Southern Sumatra Earthquakes (2010)
  • Author(s): Lubis A.M., Hashima A., Sato, T
  • Organizer: European Geophysical Union, 2010 Meeting
  • Place of Presentation: Wien, Austria
• [Presentation] Afterslip distribution corrected by the viscoelastic relaxation following the September 12, 2007 Southern Sumatra Earthquakes (2010)
  • Author(s): Lubis, A.M., Hashima, A., Sato, T
  • Organizer: European Geophysical Union, 2010 Meeting
  • Place of Presentation: ウィーン、オーストリア
• [Presentation] Afterslip distribution and viscoelastic relaxation following the 2007 Beng kulu earthquake series from GPS (2010)
  • Author(s): Lubis, A.M., Hashima, A., Sato.T
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 千葉
• [Presentation] Relationship between Afterslip of 2003 Tokachi Earthquakes and Coseismis-slip of 2004 Kushiro Earthquakes Using Viscoelastic Media (2010)
  • Author(s): Toshinori Sato, Hidenori Takemu
  • Organizer: American Geophysical Union, Fall Meeting
  • Place of Presentation: サンフランシスコ、米国
• [Presentation] Aft erslip distribution of large earthquak esusing viscoelastic media (2009)
  • Author(s): Toshinori Sato, Harutaka Higuchi
  • Organizer: American G eophysical Union Fall Meeting 2009
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2009-12-15
• [Presentation] Afterslip distribution of large earthquakes using viscoelastic media (2009)
  • Author(s): Toshinori Sato, Harutaka Higuchi
  • Organizer: American Geophysical Union Fall Meeting 2009
  • Place of Presentation: サンフランシスコ(米国)
  • Year and Date: 2009-12-15
• [Presentation] 粘弾性を考慮した巨大地震の余効すべり分布 (2008)
  • Author(s): 樋口春隆、佐藤利典
  • Organizer: 日本地球惑星科学連合2008年大会
  • Place of Presentation: 千葉
  • Year and Date: 2008-05-25
• [Presentation] 粘弾性を考慮した巨大地震の余効すべり分布 (2008)
  • Author(s): 樋口春隆、佐藤利典
  • 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: 2008-05-25
• [Remarks] ホームページ等
  • URL: http://www-es.s.chiba-u.ac.jp/edu_res/staff_sato.htm
• [Remarks]
  • URL: http://www-es.s.chiba-u.ac.jp/edu_res/staff_sato.htm