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New Hybrid Back-Projection Method and High-Frequency Radiation Events in Great Earthquake

Research Project

Project/Area Number 16K05529
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionUniversity of Tsukuba

Principal Investigator

YAGI Yuji  筑波大学, 生命環境系, 教授 (50370713)

Co-Investigator(Kenkyū-buntansha) 深畑 幸俊  京都大学, 防災研究所, 准教授 (10313206)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords震源過程 / 巨大地震の高周波励起 / 複雑な断層形状 / バックプロジェクション法 / 高周波励起現象 / 高周波励起源 / 巨大地震 / 高周波震源像
Outline of Final Research Achievements

In this study, we developed a new Hybrid Back-projection (HBP) method that simultaneously estimates the focal mechanism and the high frequency radiation source, and then applied this method to great earthquakes to understand the nature of the high frequency radiation source. To obtain appropriate results with reasonable computational cost, we decided to limit the estimated fault parameters to the slip angle. Applying the new method to the to the 2008 Sichuan earthquake, we found that the high frequency radiation sources are associated with discontinuous changes of the fault geometry and the slip vectors. We also discussed the theoretical background of HBP method and proposed a new formulation for estimating the HBP results related to the slip-rate function.

Academic Significance and Societal Importance of the Research Achievements

建造物にダメージを与える高周波地震動の発生の原因を理解することは、将来の地震被害を予測する上で重要であるだけではなく、地震の不規則な破壊伝播過程を理解する上でも重要である。本研究は、断層形状の変化が破壊伝播に及ぼす影響を地震波形から求める手法を開発して、実地震に適用した。本研究によって、断層形状や断層すべりが急変する領域で、高周波が励起されていることが実データの解析から明らかになった。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (22 results)

All 2019 2018 2017 2016

All Journal Article (10 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 10 results,  Open Access: 9 results,  Acknowledgement Compliant: 1 results) Presentation (12 results) (of which Int'l Joint Research: 8 results,  Invited: 1 results)

  • [Journal Article] Development and application of a tsunami fragility curve of the 2015?tsunami in Coquimbo, Chile2018

    • Author(s)
      Aranguiz Rafae, Urra Luisa, Okuwaki Ryo, Yagi Yuji
    • Journal Title

      Natural Hazards and Earth System Sciences

      Volume: 18 Issue: 8 Pages: 2143-2160

    • DOI

      10.5194/nhess-18-2143-2018

    • NAID

      120007133804

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Backprojection to image slip2018

    • Author(s)
      Okuwaki Ryo, Kasahara Amato, Yagi Yuji, Hirano Shiro, Fukahata Yukitoshi
    • Journal Title

      Geophysical Journal International

      Volume: 216 Issue: 3 Pages: 1529-1537

    • DOI

      10.1093/gji/ggy505

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characteristics of foreshock activity inferred from the JMA earthquake catalog2018

    • Author(s)
      Tamaribuchi Koji, Yagi Yuji, Enescu Bogdan, Hirano Shiro
    • Journal Title

      Earth, Planets and Space

      Volume: 70 Issue: 1 Pages: 90-90

    • DOI

      10.1186/s40623-018-0866-9

    • NAID

      120007134047

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rupture Process During the Mw 8.1 2017 Chiapas Mexico Earthquake: Shallow Intraplate Normal Faulting by Slab Bending2017

    • Author(s)
      Ryo Okuwaki, Yuji Yagi
    • Journal Title

      Geophysical Research Letters

      Volume: 44 Issue: 23 Pages: 11816-11823

    • DOI

      10.1002/2017gl075956

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of geometric barriers in irregular-rupture evolution during the 2008 Wenchuan earthquake2017

    • Author(s)
      Okuwaki R、Yagi Y
    • Journal Title

      Geophysical Journal International

      Volume: 212 Issue: 3 Pages: 1657-1664

    • DOI

      10.1093/gji/ggx502

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Triggering and decay characteristics of dynamically activated seismicity in Southwest Japan2017

    • Author(s)
      Opris Anca、Enescu Bogdan、Yagi Yuji、Zhuang Jiancang
    • Journal Title

      Geophysical Journal International

      Volume: 212 Issue: 2 Pages: 1010-1021

    • DOI

      10.1093/gji/ggx456

    • NAID

      120006473805

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dependence of seismic and radiated energy on shorter wavelength components2017

    • Author(s)
      Hirano Shiro、Yagi Yuji
    • Journal Title

      Geophysical Journal International

      Volume: 209 Issue: 3 Pages: 1585-1592

    • DOI

      10.1093/gji/ggx108

    • NAID

      120007127777

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rupture process of the 2016 Kumamoto earthquake in relation to the thermal structure around Aso volcano2016

    • Author(s)
      Yagi Y., Okuwaki R., Enescu B., Kasahara A., Miyakawa A., Otsubo M.
    • Journal Title

      Earth, Planets and Space

      Volume: 68 Issue: 1 Pages: 118-118

    • DOI

      10.1186/s40623-016-0492-3

    • NAID

      120005997866

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Remote triggering of seismicity at Japanese volcanoes following the 2016 M7.3 Kumamoto earthquake2016

    • Author(s)
      Enescu, B., Shimojo, K., Opris, A, and Yagi, Y.
    • Journal Title

      Earth, Planets and Space

      Volume: 68 Issue: 1 Pages: 165-165

    • DOI

      10.1186/s40623-016-0539-5

    • NAID

      120007129288

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] etas_solve: A Robust Program to Estimate the ETAS Model Parameters2016

    • Author(s)
      Amato Kasahara, Yuji Yagi, Bogdan Enescu
    • Journal Title

      Seismological Research Letters

      Volume: 87 Issue: 5 Pages: 1143-1149

    • DOI

      10.1785/0220150240

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] New insight into rupture process and generating mechanism of the 2017 Mw 6.5 Jiuzhaigou earthquake2019

    • Author(s)
      Yaping Hu, Yuji Yagi, Kousuke Shimizu, Ryo Okuwaki
    • Organizer
      日本地震学会秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Development of an inversion method to extract information on fault geometry from teleseismic data2018

    • Author(s)
      Kousuke Shimizu, Yuji Yagi, Ryo Okuwaki and Yukitoshi Fukahata
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] A convenient method for a joint use of direct and indirect prior information in inversion analyses2018

    • Author(s)
      Yukitoshi Fukahata, Yuji Yagi
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] How Does Frequency-band-limited Backprojection Image Relate to Actual Slip Behavior?2018

    • Author(s)
      Ryo Okuwaki, Yuji Yagi
    • Organizer
      2018 AGU Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Shallow intraslab normal faulting: Rupture process of the Mw 8.1 2017 Chiapas Mexico earthquake2018

    • Author(s)
      奥脇 亮、八木 勇治
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 破壊進展の加速・減速イメージング手法の提案とその解像限界の検証2018

    • Author(s)
      奥脇 亮、八木 勇治
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Flexible kinematic earthquake rupture inversion of tele-seismic waveforms: Application to the 2013 Balochistan, Pakistan earthquake2017

    • Author(s)
      Kousuke Shimizu, Yuji Yagi, Ryo Okuwaki and Amato Kasahara
    • Organizer
      AGU Fall meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Demonstration of improved seismic source inversion method of tele-seismic body wave2017

    • Author(s)
      Yuji Yagi and Ryo Okuwaki
    • Organizer
      AGU Fall meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Potency backprojection2017

    • Author(s)
      Ryo Okuwaki, Amato Kasahara and Yuji Yagi
    • Organizer
      AGU Fall meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Demonstration of improved seismic source inversion method of tele-seismic body wave2017

    • Author(s)
      Yuji Yagi and Ryo Okuwaki
    • Organizer
      IAG-IASPEI 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Hybrid back projection 法を用いた破壊伝播と断層パラメタの同時推定2016

    • Author(s)
      八木勇治・小松陽子・深畑幸俊
    • Organizer
      日本地震学会
    • Place of Presentation
      名古屋国際会議場(愛知県、名古屋市)
    • Related Report
      2016 Research-status Report
  • [Presentation] Rupture process of the 2016 Kumamoto earthquake in relation with the thermal structure around Aso volcano2016

    • Author(s)
      Yuji Yagi, Ryo Okuwaki, Bogdan Enescu, Amato Kasahara, Ayumu Miyakawa, Makoto Otsubo
    • Organizer
      アメリカ地球物理学会
    • Place of Presentation
      サンフランシスコ、アメリカ合衆国
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2021-02-19  

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