Earth, Planets and Space

, Volume 58, Issue 7, pp 911–915 | Cite as

Seafloor displacement at Kumano-nada caused by the 2004 off Kii Peninsula earthquakes, detected through repeated GPS/Acoustic surveys

  • Motoyuki Kido
  • Hiromi Fujimoto
  • Satoshi Miura
  • Yukihito Osada
  • Kentaro Tsuka
  • Takao Tabei
Open Access
Letter

Abstract

In 2004, we started monitoring crustal deformation at Kumano-nada in the Nankai trough using the GPS/Acoustic technique. We observed a large southward seafloor displacement of ∼30 cm associated with the off Kii Peninsula earthquake, which occurred in September 2004, between our two survey campaigns in August and November 2004. The observed seafloor displacement is larger than that predicted from a slip model derived solely from GPS measurements on land. This may indicate the earthquake fault is slightly shallower and extends move to the NW than previously estimated.

Key words

GPS/Acoustic measurement seafloor displacement Kumano-nada 2004 off Kii Peninsula earthquake 

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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2006

Authors and Affiliations

  • Motoyuki Kido
    • 1
  • Hiromi Fujimoto
    • 1
  • Satoshi Miura
    • 1
  • Yukihito Osada
    • 1
  • Kentaro Tsuka
    • 2
  • Takao Tabei
    • 2
  1. 1.RCPEV, Graduate School of ScienceTohoku UniversitySendaiJapan
  2. 2.Natural Env. Sci.Kochi UniversityKochiJapan

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