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Undersea co-seismic crustal movements associated with the 2005 Off Miyagi Prefecture Earthquake detected by GPS/acoustic seafloor geodetic observation

Abstract

We have been carrying out seafloor geodetic observations at two reference points situated off Miyagi Prefecture, northeastern Japan, using the GPS/Acoustic combination technique. Comparison of position estimates before and after the 2005 Off-Miyagi Prefecture Earthquake revealed a co-seismic crustal movement as large as 10 cm eastward at the site approximately 10 km from the epicenter, while no prominent movement was found at another site located 60 km away from the epicenter. The results at these two sites are consistent with crustal deformation calculated from the rectangular dislocation model on the fault derived from crustal movements observed at GEONET stations on land.

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Correspondence to Yoshihiro Matsumoto.

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Matsumoto, Y., Fujita, M., Ishikawa, T. et al. Undersea co-seismic crustal movements associated with the 2005 Off Miyagi Prefecture Earthquake detected by GPS/acoustic seafloor geodetic observation. Earth Planet Sp 58, 1573–1576 (2006). https://doi.org/10.1186/BF03352663

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Key words

  • GPS/acoustic
  • seafloor geodetic observation
  • co-seismic crustal movement
  • the 2005 Off Miyagi Prefecture Earthquake