Relationship between ground and crustal deformations in the western part of the Oginojo Anticline, synchronous with the 2007 Niigataken Chuetsu-oki Earthquake

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  • Otsubo Makoto
    Institute of Geology and Geoinformation (IGG), Geological Survey of Japan, AIST
  • Yamaji Atsushi
    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University

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  • 2007年新潟県中越沖地震にともなう小木ノ城背斜西翼隆起域での地震被害と地殻変動との関連
  • 2007ネン ニイガタケン チュウエツオキ ジシン ニ トモナウ オギノジョウ ハイ シャ セイヨク リュウキイキ デ ノ ジシン ヒガイ ト チカク ヘンドウ ト ノ カンレン

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Abstract

We investigated ruptures in the asphalt and concrete pavement of roads in the uplifted belt of the western wing of the Oginojo Anticline, where crustal deformation associated with the 2007 Niigataken Chuetsu-oki Earthquake (Mj 6.8) has been detected using synthetic aperture radar (SAR) interferometry. In the region of uplift (displacement >8 cm) on the western limb, the pavement was ruptured at many places, but not by faults. Open cracks are dominant in the uplifted belt, whereas cracks generated by gravity sliding or sagging of roads were observed over large parts of the study area. Striations on the bedding planes on the western limb indicated flexural slip folding mechanism; however, we observed no bedding plane slips. These observations suggest that open cracks of the uplift region were generated in response to local coseismic uplift.

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