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| Titel |
Tomography of the 2011 Iwaki earthquake (M 7.0) and Fukushima nuclear power plant area |
| VerfasserIn |
P. Tong, D. Zhao, D. Yang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 3, no. 1 ; Nr. 3, no. 1 (2012-02-14), S.43-51 |
| Datensatznummer |
250000834
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| Publikation (Nr.) |
 copernicus.org/se-3-43-2012.pdf |
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| Zusammenfassung |
| 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 low-velocity 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. |
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