Tomography of the 2011 Iwaki earthquake (M 7.0) and Fukushima nuclear power plant area

P. Tong, D. Zhao, D. Yang

研究成果: Article査読

57 被引用数 (Scopus)

抄録

High-resolution tomographic images of the crust and upper mantle in and around the area of the 2011 Iwaki earthquake (M 7.0) and the Fukushima nuclear power plant are determined by inverting a large number of high-quality arrival times with both the finite-frequency and ray tomography methods. The Iwaki earthquake and its aftershocks mainly occurred in a boundary zone with strong variations in seismic velocity and Poisson's ratio. Prominent lowvelocity and high Poisson's ratio zones are revealed under the Iwaki source area and the Fukushima nuclear power plant, which may reflect fluids released from the dehydration of the subducting Pacific slab under Northeast Japan. The 2011 Tohoku-oki earthquake (Mw 9.0) caused static stress transfer in the overriding Okhotsk plate, resulting in the seismicity in the Iwaki source area that significantly increased immediately following the Tohoku-oki mainshock. Our results suggest that the Iwaki earthquake was triggered by the ascending fluids from the Pacific slab dehydration and the stress variation induced by the Tohoku-oki mainshock. The similar structures under the Iwaki source area and the Fukushima nuclear power plant suggest that the security of the nuclear power plant site should be strengthened to withstand potential large earthquakes in the future.

本文言語English
ページ(範囲)43-51
ページ数9
ジャーナルSolid Earth
3
1
DOI
出版ステータスPublished - 2012

ASJC Scopus subject areas

  • 土壌科学
  • 地球物理学
  • 地質学
  • 地球化学および岩石学
  • 地表過程
  • 層序学
  • 古生物学

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