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Earth Planets Space, Vol. 61 (No. 7), pp. e29-e32, 2009

E-LETTER

Earthquake fault of the 26 May 2006 Yogyakarta earthquake observed by SAR interferometry

Takeshi Tsuji1, Katsuya Yamamoto1, Toshifumi Matsuoka1, Yasuhiro Yamada1, Kyosuke Onishi1, Alfian Bahar2, Irwan Meilano2, and Hasanuddin Z. Abidin2

1Graduate School of Engineering, Kyoto University, Kyoto, Japan
2Institute of Technology Bandung (ITB), Jl. Ganesha 10, Bandung 40132, Indonesia

(Received April 1, 2009; Revised July 12, 2009; Accepted July 15, 2009; Online published August 7, 2009)

Abstract: We analyzed synthetic aperture radar interferometry (InSAR) to reveal surface deformation associated with the 26 May 2006 Yogyakarta earthquake, for which the fault location and geometry have not been clearly determined. Our results demonstrate that surface deformation occurred ∼10 km east of the Opak River fault thought to be the source of the May 2006 event and that the probable causative fault delineated in this study is consistent with aftershock epicenters determined by a temporary seismic network. The trace of the causative fault bends at its southern termination toward the Opak River fault as if it were a splay. Our data demonstrate that another probable slip plane extends across Yogyakarta and that the heavily damaged areas covered by young volcanic deposits may have undergone subsidence during the earthquake.
Key words: May 2006 Yogyakarta earthquake, SAR interferometry, fault geometry.


Corresponding author E-mail: tsuji@earth.kumst.kyoto-u.ac.jp


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