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Strong ground motions recorded by a near-source seismographic array during the 16 August 2005 Miyagi-Ken-Oki, JAPAN, earthquake (Mw 7.2)

Earth, Planets and Space volume 58, pages 1555–1559 (2006)Cite this article

Abstract

An earthquake of Mw 7.2 took place on August 16, 2005 at a plate boundary between the Pacific plate and the North American plate off the coast of Miyagi Prefecture, Northeast Japan. During the Miyagi-Ken-Oki event, we succeeded in recording strong ground motions at six stations in a seismograhic array with an epicentral distance of about 70 km, where we have been operating seven strong-motion seismometers in an aperture of about 500 m since April 2004. The predominant period of the ground motion was shorter than 0.3 s. The peak ground acceleration exceeded 1.7 g at a station where non-linear site response may have occurred during the mainshock. The short-period strong ground motions show a large spatial variation, with up to a ten-fold difference in amplitude even within the array. However, there is a similarity between waveforms registered at different stations for periods longer than 0.4 s. Therefore, the difference in the ground motions may be mainly attributed to the difference in the shallow structure just beneath the stations.

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Authors and Affiliations

  1. Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Hisashi Nakahara, Kaoru Sawazaki, Nobumasa Takagi, Takeshi Nishimura & Haruo Sato

  2. National Research Institute for Earth Science and Disaster Prevention, Tsukuba, 305-0006, Japan

    Hiroyuki Fujiwara

Authors
  1. Hisashi Nakahara
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  2. Kaoru Sawazaki
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  3. Nobumasa Takagi
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  4. Takeshi Nishimura
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  5. Haruo Sato
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  6. Hiroyuki Fujiwara
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Corresponding author

Correspondence to Hisashi Nakahara.

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Nakahara, H., Sawazaki, K., Takagi, N. et al. Strong ground motions recorded by a near-source seismographic array during the 16 August 2005 Miyagi-Ken-Oki, JAPAN, earthquake (Mw 7.2). Earth Planet Sp 58, 1555–1559 (2006). https://doi.org/10.1186/BF03352660

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  • DOI: https://doi.org/10.1186/BF03352660

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