2011年東北地方太平洋沖地震前後のTerraSAR-X強度画像を用いた 地殻変動の検出  [in Japanese] Estimation of crustal movement due to the 2011 Tohoku, Japan Earthquake from TerraSAR-X intensity images  [in Japanese]

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Abstract

2011年3月11日に発生した東北地方太平洋沖地震は、東日本の広域にわたって甚大な被害を引き起こした。またこの地震によって、陸上では最大約5 mの地殻変動が観測された。本研究では、地震前後に撮影された高解像度衛星TerraSAR-Xの強度画像を比較し、無被害の建物の2時期の位置ずれを検出し、これを地殻変動と見なす手法を提案した。最初に、地震前後の強度画像から後方散乱係数の高い建物を抽出し、地震前後の建物を比較することで、変化のない建物の検出を行った。無被害建物の地震前後における位置ずれを面積相関法で求め、それらの平均値をエリア内の地殻変動量と見なした。提案手法を東北地方と東京中心部の衛星画像に適用し、GPS電子基準点の記録との比較で結果の精度を検証した。

The 11 March 2011 Tohoku, Japan Earthquake caused widespread devastation in the eastern Japan. Crustal movements larger than 5 m were observed on the land after the earthquake. In this study, a method to grasp the surface movement from pre- and post-event TerraSAR-X intensity images was proposed. Since the shifts of non-changed buildings between the two SAR images can be seen as the crustal movements, firstly the buildings in the pre- and post-event images were extracted by a segmentation approach. Then non-changed buildings were detected by matching the buildings in the pre- and post-event images at similar locations. Finally, the shifts were calculated by area-based matching. The method was tested on the TerraSAR-X images of Tohoku region and central Tokyo, and the accuracy was verified by the observed data from GPS ground stations.

Journal

  • Journal of Japan Association for Earthquake Engineering

    Journal of Japan Association for Earthquake Engineering (12), 4_3-4_13, 2012

    JAPAN ASSOCIATION FOR EARTHQUAKE ENGINEERING

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