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Detection of the temporal change in the interplate locking beneath NE Japan based on spatial gradients of displacement rate field

Research Project

Project/Area Number 17K14387
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

IINUMA Takeshi  国立研究開発法人海洋研究開発機構, 海域地震火山部門(地震津波予測研究開発センター), 研究員 (10436074)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywordsプレート間固着 / 変位速度場 / 時空間変化 / 周期的変化 / 東北日本 / 固体地球物理学 / 測地 / 地震
Outline of Final Research Achievements

I estimated the spatio-temporal change in the interplate locking along the plate boundary in northeast Japan based on the spatial gradient in each swath configured along the direction normal to the Japan Trench. I examined whether the depth of the down-dip limit of the interplate locking zone in the northeast Japan temporally changes or not by analyzing the spatial gradients of the vertical displacement rates. The results show that the depth of the down-dip limit of the interplate locking zone is not time-invariant. In the areas north and south to the rupture area of the 2011 Tohoku-oki earthquake, it seems to change semi-periodically.

Academic Significance and Societal Importance of the Research Achievements

2011年東北地方太平洋沖地震のような超巨大地震が発生するプレート境界における、プレート間の歪の蓄積および解放の過程についての重要な知見を得ることができた。本研究は一つのケーススタディではあるが、開発し、用いた手法は他の沈み込み帯に適用可能であり、それぞれの沈み込み帯におけるプレート間の歪の蓄積・解放過程を把握し、巨大地震の発生ポテンシャルを評価するためのツールの一つとなり得るものである。

Report

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

    (3 results)

All 2019 2018 2017

All Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Periodic Occurrence of the Slow Slip Events Off Kyushu Island, Southwest Japan, Based on Spatial Gradients of Displacement Rate Field and Activities of Small Repeating Earthquakes2019

    • Author(s)
      Iinuma, T., and N. Uchida
    • Organizer
      Seismological Society of America 2019 Annual Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 変位速度場の空間勾配解析に基づく東北日本下のプレート固着域下限の時空間変化の検出2018

    • Author(s)
      飯沼卓史
    • Organizer
      日本測地学会第130回講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 東北地方太平洋沖地震前の周期的変動を伴うプレート間カップリングの強度低下2017

    • Author(s)
      飯沼卓史
    • Organizer
      日本地震学会2017年度秋季大会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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