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Nat. Hazards Earth Syst. Sci., 15, 637-645, 2015
https://doi.org/10.5194/nhess-15-637-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
27 Mar 2015
Estimation of three-dimensional crustal movements in the 2011 Tohoku-Oki, Japan, earthquake from TerraSAR-X intensity images
W. Liu1, F. Yamazaki1, M. Matsuoka2, T. Nonaka3, and T. Sasagawa3 1Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Chiba, Japan
2Department of Built Environment, Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
3Satellite Business Division, PASCO Corporation, Tokyo, Japan
Abstract. The Tohoku-Oki earthquake on 11 March 2011 caused significant widespread crustal movements. In a previous study, we proposed a method for capturing two-dimensional (2-D) surface displacements from a pair of pre- and post-event TerraSAR-X (TSX) intensity images. However, it is impossible to detect three-dimensional (3-D) displacements from one pair of TSX images. In this study, three pairs of pre- and post-event TSX images taken on different paths were used to estimate 3-D crustal movements. The relationship between the actual 3-D displacements and the converted 2-D movements in the synthetic-aperture radar (SAR) images was derived based on the observation model of a SAR sensor. The 3-D movements were then calculated from three sets of detected 2-D movements that occurred within a short time period. Compared with GPS observations, the proposed method was found to be capable of detecting the 3-D crustal movements with sub-pixel accuracy.

Citation: Liu, W., Yamazaki, F., Matsuoka, M., Nonaka, T., and Sasagawa, T.: Estimation of three-dimensional crustal movements in the 2011 Tohoku-Oki, Japan, earthquake from TerraSAR-X intensity images, Nat. Hazards Earth Syst. Sci., 15, 637-645, https://doi.org/10.5194/nhess-15-637-2015, 2015.
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Short summary
The method for capturing two-dimensional surface displacements was applied to three pairs of pre- and post-event high-resolution TerraSAR-X intensity images of the 2011 Tohoku-Oki earthquake taken in ascending and descending paths, and the results were used for estimating the actual three-dimensional movements. Compared with the GPS data at three ground-control stations, the estimation errors in the horizontal and vertical directions were less than 0.3 m in spite of the pixels size (1.25 m).
The method for capturing two-dimensional surface displacements was applied to three pairs of...
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