Vertical Movements after the 1995 Hyogoken-Nanbu Earthquake by Leveling of Short Interval Points in Kobe Area

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  • 1995年兵庫県南部地震後の神戸地域における上下変動
  • 1995年兵庫県南部地震後の神戸地域における上下変動--短い測点間隔の水準観測結果
  • 1995ネン ヒョウゴケン ナンブ ジシンゴ ノ コウベ チイキ ニ オケル
  • ―短い測点間隔の水準観測結果―

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Abstract

The crustal movement was investigated by the leveling along four routes with short interval of about 25m in the Kobe area, during the period of one year from March, 1995 to February, 1996, after the 1995 Hyogoken-Nanbu Earthquake. The results are summarized as follows: 1) Vertical tectonic movements occurred in a broad area in the plain, and the displacement reached more than 20mm in maximum. 2) During the period from March to July, 1995, the distribution of vertical movements was continuous along each leveling route, and the uplifts like buckling were recognized in the plain. Oppositely, during the period from October, 1995 to February, 1996, stepping displacements were recognized around active faults, and the lowering of the coastal area occurred. 3) Those vertical movements could be attributed to the aftereffect of the 1995 Hyogoken-Nanbu Earthquake. It is possible that horizontal stress in the shallow subsurface was increased during the earlier period of the measurements, and then the fault displacements reached close to the ground surface. 4) The delay of the displacements after the earthquake may be attributed to the existence of thick soft sedimentary rocks, and the branched fault system in the Quarternary structural basin.

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