Estimating fault slip directly from GPS phase data: For understandings of postseismic slip

• Project/Area Number: 24540453
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kyoto University
• Principal Investigator: miyazaki shinichi 京都大学, 理学(系)研究科(研究院), 准教授 (00334285)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: GPS / 断層すべり / 地殻変動 / 衛星測位 / 国際情報交換 / 国際研究者交流 アメリカ合衆国

Outline of Final Research Achievements

We developed a program to infer the slip on the fault under the condition that the slip is uniform over the entire fault. This is applicable only for a limited area up to 10km because the error is not corrected. We also estimated 2.5 years of afterslip and viscoelastic rebound simultaneously for the 2011 Tohoku-Oki earthquake. We quantitatively evaluated contributions of afterslip and viscoelastic relaxation. The latter causes landward movements at the ocean bottom GPS/Acoustic stations.

Research Products

• [Journal Article] Afterslip and viscoelastic relaxation following the 2011 Tohoku-oki earthquake (Mw9.0) inferred from inland GPS and seafloor GPS/Acoustic data (2015)
  • Author(s): Yamagiwa S., S. Miyazaki, K. Hirahara and Y. Fukahata
  • Journal Title: Geophysical Research Letters Volume: 42 Issue: 1 Pages: 66-73
  • DOI: 10.1002/2014gl061735
  • NAID: 120005619786
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Coseismic slip, Afterslip, and Viscoelastic relaxation following the 2011 Tohoku Earthquake inferred from surface displacement data (2015)
  • Author(s): Yamagiwa S., S. Miyazaki, K. Hirahara, Y. Fukahata
  • Organizer: AOGS 12th Annual Meeting
  • Place of Presentation: シンガポール
  • Year and Date: 2015-08-02 – 2015-08-07
• [Presentation] Coseismic slip, Afterslip, and Viscoelastic relaxation following the 2011 Tohok Earthquake inferred from surface displacement data. (2015)
  • Author(s): Yamagiwa, S., S. Miyazaki, K. Hirahara, Y. Fukahata
  • Organizer: AOGS 12th Annual Meeting
  • Place of Presentation: シンガポール
  • Year and Date: 2015-08-02
  • Int'l Joint Research
• [Presentation] Inversion of GNSS and GPS/Acoustic data for afterslip and viscoelastic relaxation following the 2011 Tohoku earthquake (2015)
  • Author(s): Yamagiwa S., S. Miyazaki, K. Hirahara, Y. Fukahata
  • Organizer: European Geosciences Union General Assembly 2015
  • Place of Presentation: ウィーン
  • Year and Date: 2015-04-12 – 2015-04-17
• [Presentation] Inversion of GNSS and GPS/Acoustic data for afterslip and viscoelastic relaxation following the 2011 Tohoku earthquake. (2015)
  • Author(s): Yamagiwa, S., S. Miyazaki, K. Hirahara, Y. Fukahata
  • Organizer: European Geoscience Union General Assembly 2015
  • Place of Presentation: ウィーン
  • Year and Date: 2015-04-12
  • Int'l Joint Research
• [Presentation] Coseismic Slip Distribution for the 2011 Tohoku-Oki Earthquake With Topographic Corrections (2014)
  • Author(s): Hitoshi GOSHIMA, Shin’ichi MIYAZAKI
  • Organizer: Symposium on Geodesy for Earthquake and Natural Hazards (GENAH 2014)
  • Place of Presentation: Matsushima, Miyagi, Japan