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Earth Planets Space, Vol. 58 (No. 1), pp. 51-56, 2006

LETTER

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

Takuya Nishimura, Satoshi Fujiwara, Makoto Murakami, Hisashi Suito, Mikio Tobita, and Hiroshi Yarai

Geographical Survey Institute, Japan

(Received August 10, 2005; Revised September 26, 2005; Accepted September 30, 2005; Online published January 27, 2006)

Abstract: 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) earthquake, crustal deformation, GPS, InSAR, slip distribution.


Corresponding author E-mail: t_nisimura@gsi.go.jp


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