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Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network

Earth, Planets and Space volume 60, pages 1197–1201 (2008)Cite this article

Abstract

A large earthquake of Mj 7.2 occurred on June 14, 2008, beneath the border between Iwate and Miyagi prefectures in northeastern Japan. We propose a simple rectangular fault model based on a dense GPS network, including continuous GPS sites run by four agencies, to describe the coseismic deformation. The coseismic displacements are estimated by kinematic PPP (precise point positioning) analysis. Near the hypocenter, colocated independent instruments (integrated accelerogram and kinematic PPP) measure the same large displacement caused by the mainshock. The fault model explains the observations well and reproduces the observed complex spatial pattern, especially around the northern part of the focal area, which is the focus of a debate on whether or not the coseismic slip occurred on the Dedana fault system. Our results show that no major slip on the Dedana fault system occurred. The estimated amount of moment release was equivalent to Mw 6.9, and the maximum slip reached 3.5 m on the southern sub-fault.

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Authors and Affiliations

  1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Yusaku Ohta, Mako Ohzono, Satoshi Miura, Takeshi Iinuma, Kenji Tachibana, Kota Takatsuka, Kayo Miyao, Toshiya Sato & Norihito Umino

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  1. Yusaku Ohta
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  2. Mako Ohzono
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  3. Satoshi Miura
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  4. Takeshi Iinuma
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  5. Kenji Tachibana
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  6. Kota Takatsuka
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  7. Kayo Miyao
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  8. Toshiya Sato
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  9. Norihito Umino
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Correspondence to Yusaku Ohta.

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Ohta, Y., Ohzono, M., Miura, S. et al. Coseismic fault model of the 2008 Iwate-Miyagi Nairiku earthquake deduced by a dense GPS network. Earth Planet Sp 60, 1197–1201 (2008). https://doi.org/10.1186/BF03352878

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  • DOI: https://doi.org/10.1186/BF03352878

Key words

  • 2008 Iwate-Miyagi Nairiku earthquake
  • kinematic GPS
  • coseismic fault model