Estimation of activity of a blind fault using the spatial variation of the relative heights of fluvial terraces : An example of the Iwai river above the focal area of the 2008 Iwate-Miyagi Nairiku earthquake

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  • 河成段丘面の比高分布から推定される伏在断層の活動性
  • 河成段丘面の比高分布から推定される伏在断層の活動性 : 2008年岩手・宮城内陸地震震源域直上の磐井川を例に
  • カセイ ダンキュウメン ノ ヒ コウブンプ カラ スイテイ サレル フクザイ ダンソウ ノ カツドウセイ : 2008ネン イワテ ・ ミヤギ ナイリク ジシン シンゲンイキ チョクジョウ ノ イワイガワ オ レイ ニ
  • —2008年岩手・宮城内陸地震震源域直上の磐井川を例に—

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Abstract

<p>Above the focal area of the 2008 Iwate-Miyagi-Nairiku earthquake (Mj7.2), we discuss the activity of the blind reverse fault by studying the spatial variation in the relative heights of fluvial terraces. We revised the correlation and chronology of the fluvial terraces along the Iwai river. To obtain the spatial variation of uplift in the Pleistocene, we measured the relative heights of fluvial terraces. Crustal movements of the 2008 earthquake were also obtained by comparing airborne LiDAR DEM data sets before and after the earthquake. The geological structure of the Pliocene strata, estimated from the seismic profile and the spatial variation of uplift from the relative height of fluvial terraces, can be explained well by the accumulation of crustal deformation caused by the earthquakes along the fault. From these results, it can be concluded that the relative height distribution of the fluvial terraces is an effective index for investigation of the activity of a blind fault.</p>

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