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Open Access

Fault model of the 2005 Fukuoka-ken Seiho-oki earthquake estimated from coseismic deformation observed by GPS and InSAR

  • Takuya Nishimura18Email author,
  • Satoshi Fujiwara18,
  • Makoto Murakami18,
  • Hisashi Suito18,
  • Mikio Tobita18 and
  • Hiroshi Yarai18
Earth, Planets and Space200658:BF03351913

Received: 10 August 2005

Accepted: 30 September 2005

Published: 27 January 2006


On 20 March 2005, the Fukuoka-ken Seiho-oki (the 2005 West off Fukuoka Prefecture) earthquake (MJMA7.0) occurred in northern Kyushu, western Japan. We used coseismic deformation observed by GPS and InSAR to construct a fault model. The uniform slip model of rectangular dislocation in an elastic half-space suggests 1.4 m of left-lateral strike slip faulting on a near-vertical fault. The fault strike is 298 degrees and its southeastern edge was strongly constrained by the displacement at a permanent GPS station located on Shikanoshima, which is consistent with the aftershock distribution. We estimated slip distribution on a planar fault and found the maximum slip of 1.9 m near the surface. Large slip is concentrated at depths of 0 to 10 km in an along-strike range from the hypocenter to 10 km east-southeast of it.

Key words

2005 Fukuoka-ken Seiho-oki (West off Fukuoka Prefecture) earthquakecrustal deformationGPSInSARslip distribution