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Mysterious behavior of ionosphere immediately before and after large earthquakes

Research Project

Project/Area Number 26400442
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionHokkaido University

Principal Investigator

Heki Kosuke  北海道大学, 理学研究院, 教授 (30280564)

Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsGNSS / TEC / 電離圏擾乱 / 地震前兆 / 三次元構造 / 電離圏全電子数 / トモグラフィー / マグニチュード / チリ地震 / 宇宙天気 / 地震予知 / 短期予知 / 衛星測位システム / 地磁気変動
Outline of Final Research Achievements

I studied anomalies of ionospheric total electron content (TEC) related to earthquakes using GNSS satellites. The quantitative relationship between the magnitude and coseismic TEC pulsation has been established. Preseismic ionospheric changes have been discovered shortly after the 2011 Tohoku-oki earthquake. I collected similar observation cases before over ten large earthquakes with moment magnitudes (Mw) 7.8-9.2, and revealed several kinds of Mw dependences of these anomalies, e.g. precursor times (40 min. for M9 and 20 min. for M8 events), spatial dimensions, and strength of preseismic changes in terms of changing rate of TEC. From 3-D structure of ionospheric anomalies, it was found that the preseismic ionospheric anomalies are due to positive electric charges on the surface.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (23 results)

All 2017 2016 2015 2014

All Journal Article (9 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Acknowledgement Compliant: 1 results,  Open Access: 1 results) Presentation (14 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results)

  • [Journal Article] Three-dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile2016

    • Author(s)
      He L. and K. Heki
    • Journal Title

      Geophysical Research Letters

      Volume: 43 Issue: 14 Pages: 7287-7293

    • DOI

      10.1002/2016gl069863

    • NAID

      120005951958

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Mw dependence of preseismic ionospheric electron enhancements2015

    • Author(s)
      Heki, K. and Y. Enomoto
    • Journal Title

      J. Geophys. Res. Space Phys.

      Volume: 120 Issue: 8 Pages: 7006-7020

    • DOI

      10.1002/2015ja021353

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Morphology and dynamics of daytime mid-latitude sporadic-E patches revealed by GPS total electron content observations in Japan2015

    • Author(s)
      Maeda, J. and K. Heki
    • Journal Title

      Earth Planets and Space

      Volume: 67 Issue: 1 Pages: 89-89

    • DOI

      10.1186/s40623-015-0257-4

    • NAID

      120005625299

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atmospheric resonant oscillations by the 2014 eruption of the Kelud volcano, Indonesia, observed with the ionospheric Total Electron Contents and seismic signal2015

    • Author(s)
      Nakashima, Y., K. Heki, A. Takeo, M. Cahyadi, A. Aditiya, and K. Yoshizawa
    • Journal Title

      Earth Planet. Sci. Lett.

      Volume: 434 Pages: 112-116

    • DOI

      10.1016/j.epsl.2015.11.029

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Imaging the midlatitude sporadic-E plasma patches with a coordinated observation of space-borne InSAR and GPS total electron content2015

    • Author(s)
      Maeda, J., T. Suzuki, M. Furuya and K. Heki
    • Journal Title

      Geophys. Res. Lett.

      Volume: 43 Issue: 4 Pages: 1419-1425

    • DOI

      10.1002/2015gl067585

    • NAID

      120005841310

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Coseismic ionospheric disturbance of the large strike-slip earthquakes in North Sumatra in 2012: Mw dependence of the disturbance amplitudes2015

    • Author(s)
      Cahyadi, M.N. and K. Heki
    • Journal Title

      Geophys. Jour. International

      Volume: 200 Issue: 1 Pages: 116-129

    • DOI

      10.1093/gji/ggu343

    • NAID

      120005602529

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Preseismic TEC changes for Tohoku-Oki earthquake: Comparisons between simulations and observations2015

    • Author(s)
      Kuo, C.L., L.C. Lee, and K. Heki
    • Journal Title

      Terr. Atmos. Ocean. Sci.

      Volume: 26 Issue: 1 Pages: 63-72

    • DOI

      10.3319/tao.2014.08.19.06(grt)

    • NAID

      120005603797

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Reply to comment by K. Heki and Y. Enomoto on "Preseismic ionospheric electron enhancements revisited"2014

    • Author(s)
      Heki, K. and Y. Enomoto
    • Journal Title

      Jour. Geophys. Res. Space Phys.

      Volume: 119 Issue: 7 Pages: 6016-6018

    • DOI

      10.1002/2014ja020223

    • NAID

      120005530832

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] GNSSデータに地震前兆を探す2014

    • Author(s)
      日置幸介
    • Journal Title

      計測と制御

      Volume: 53 Pages: 469-472

    • NAID

      130005457939

    • Related Report
      2014 Research-status Report
  • [Presentation] Preseismic ionospheric anomalies: Current overview and perspective2017

    • Author(s)
      Heki, K., L. He, and I. N. Muafiry
    • Organizer
      2nd Geo-lab and RISH Joint Workshop on GNSS and SAR Technologies for Atmospheric Sensing
    • Place of Presentation
      京都府宇治市京都大学
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ionospheric anomalies immediately before large earthquakes: Observation by GNSS-TEC2016

    • Author(s)
      Heki, K.
    • Organizer
      ICG+2016
    • Place of Presentation
      上海天文台(中国、上海市)
    • Year and Date
      2016-07-28
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] チリで発生した三つの大地震の直前に起こった電離圏異常の時空間構造2016

    • Author(s)
      日置幸介、賀黎明
    • Organizer
      JPGU
    • Place of Presentation
      千葉県千葉市幕張メッセ
    • Year and Date
      2016-05-22
    • Related Report
      2016 Annual Research Report
  • [Presentation] 3-D structure of ionospheric anomalies immediately before large earthquakes: The 201I llapel (Mw8.3) and 2016 Kumamoto (Mw7.0) cases2016

    • Author(s)
      Heki, K., L. He, and I. N. Muafiry
    • Organizer
      American Geophysical Union Fall Meeting
    • Place of Presentation
      サンフランシスコ市国際会議場(米国、カリフォルニア州)
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 熊本地震の直前に現れたstagnant MSTID2016

    • Author(s)
      日置幸介、賀黎明
    • Organizer
      日本地震学会秋季大会
    • Place of Presentation
      名古屋国際会議場(愛知県、名古屋市)
    • Related Report
      2016 Annual Research Report
  • [Presentation] Mw dependence of ionospheric electron enhancement immediately before large earthquakes2015

    • Author(s)
      Heki, K. and L. He
    • Organizer
      アメリカ地球物理連合秋季大会
    • Place of Presentation
      米国サンフランシスコ市モスコーニ国際会議場
    • Year and Date
      2015-12-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Monitoring Ionospheric Electrons with GNSS for Very Short-term Earthquake Prediction2015

    • Author(s)
      Heki, K.
    • Organizer
      The 7th International Conference on Geo-information Technologies for Natural Disaster
    • Place of Presentation
      アラブ首長国連合アルアイン市アルアイン大学
    • Year and Date
      2015-12-08
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 地震直前の電離圏電子数上昇のMw依存性2015

    • Author(s)
      日置幸介、榎本祐嗣
    • Organizer
      日本測地学会秋季大会
    • Place of Presentation
      福岡県福岡市西新ホール
    • Year and Date
      2015-10-14
    • Related Report
      2015 Research-status Report
  • [Presentation] Ionospheric electron enhancement 20-80 min. before large earthquakes: Examples from 8 earthquakes with Mw 8.2 -9.22015

    • Author(s)
      Heki, K. and Y. Enomoto
    • Organizer
      The 26th General Assembly of IUGG
    • Place of Presentation
      チェコ共和国プラハ市国際会議場
    • Year and Date
      2015-06-23
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2011年東北沖地震発生40分前に始まったGPS-TECと地磁気偏角の前兆変動について2015

    • Author(s)
      日置幸介、榎本祐嗣
    • Organizer
      日本地球惑星科学連合大会
    • Place of Presentation
      千葉県千葉市幕張メッセ
    • Year and Date
      2015-05-24
    • Related Report
      2015 Research-status Report
  • [Presentation] 2015年ネパール地震の約20分前に発生した電離圏全電子数の上昇2015

    • Author(s)
      日置幸介
    • Organizer
      日本地球惑星科学連合大会
    • Place of Presentation
      千葉県千葉市幕張メッセ
    • Year and Date
      2015-05-24
    • Related Report
      2015 Research-status Report
  • [Presentation] Preseismic ionospheric electron enhancements: A few remaining problems2014

    • Author(s)
      Heki, K.
    • Organizer
      AOGS
    • Place of Presentation
      ホテルロイトン札幌(札幌市)
    • Year and Date
      2014-07-30 – 2014-08-01
    • Related Report
      2014 Research-status Report
  • [Presentation] Some problems in preseismic ionospheric electron enhancements2014

    • Author(s)
      Heki, K.
    • Organizer
      GENAH2014
    • Place of Presentation
      松島大観荘(宮城県松島町)
    • Year and Date
      2014-07-22 – 2014-07-26
    • Related Report
      2014 Research-status Report
  • [Presentation] 再び地震直前の電離圏電子数上昇について:移動性の識別と受信機周波数間バイアスの推定2014

    • Author(s)
      日置幸介
    • Organizer
      JPGU
    • Place of Presentation
      パシフィコ横浜(横浜市)
    • Year and Date
      2014-04-28 – 2014-05-02
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2018-03-22  

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