Surface Fault Ruptures Associated with the 1995 Hyogoken-Nanbu Earthquake
Surface Fault Ruptures Associated with the 1995 Hyogoken-Nanbu Earthquake
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与 1995 年兵库县南部地震相关的地表断层破裂
DOI：
10.5026/jgeography.104.127
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发表时间：
1995
影响因子：
3.1
通讯作者：
N. Chida
中科院分区：
文献类型：
--
作者：
T. Nakata;K. Yomogida;Jun;Teruaki Sakamoto;K. Asahi;N. Chida
引起1995年破坏性的小古根-南部地震（Ms=7.2）的地表断层的明显断裂出现在野岛断层上，野岛断层是日本淡路岛西北海岸的一条活动断层。浅滩岛地表断裂从震中附近的Easki向北端町丰岛持续向西南方向延伸约9公里，造成道路最大右偏移1.9米，水田堤防垂直位移最大达1.2米，神户未见大地表断裂，造成重大损失和人员伤亡。大多数地表破裂都是沿着野岛断层原有的活动断层轨迹发生的。断裂一般呈左台阶状排列，局部的伸展和挤压形态如沟槽、鼹鼠径迹、隆起等有时与断层走向的变化有关。地震断层似乎从靠近地震断层系统主要断层的明石海峡的震源向东北和西南两侧传播。根据浅滩岛地震断裂带的滑动分布推断出的震源过程较好地解释了早期约4秒的宽带地震仪近场p波波形。后期较大的振幅应归因于东北断裂向神户方向断裂。
Distinctive ruptures of the surface faulting which generated the destructive 1995 Hyogoken-Nanbu Earthquake (Ms=7.2) appeared along the Nojima fault, an active fault on the northwestern coast of Awaji island, Japan. The surface fault ruptures in Awaji island extend southwestward continuously for about 9km from Easki near the epicenter to Toshima in Hokudan town, and caused prominent right-latearl off-sets of 1.9m at maximum on roads, paddy dikes with vertical displacement of 1.2m at maximum, while no large surface faulting has been reported in Kobe where major damage and casualties have appeared.Most of the surface ruptures follow along the pre-existing active fault traces of the Nojima fault. The ruptures are generally arranged in left-stepping echelon, and local extensional and compressional jog forms such as trenches, mole tracks, buldges are sometimes related to changes in fault strikes.The earthquake fault seems to have propagated bilaterally northeastward and southwestward from the hypocenter in the Straits of Akashi near the major jog of the earthquake fault system. The source process of the earthquake deduced from the slip distribution along the earthquake fault in Awaji island well explains near-field P-waveforms of broad-band seismometers for early part in about 4 seconds. The later part of much larger amplitude should attribute to the northeast fault ruptures toward Kobe.