摘要
对恩施断裂中段构造地貌、断裂剖面与洪积扇变形的分析表明,断裂在第四纪活动明显,以正倾滑兼右旋走滑为特征。根据洪积扇位错的水平距离、垂直高差以及形成时代,估算出断裂在中更新世晚期至晚更新世早、中期的右旋运动速率为0.430.5 mm/a,垂直运动速率0.070.17 mm/a。
On the basis of detailed geomorphologic analysis of faulting profiles and deformed alluvial fans,etc.we suggest that the Enshi fault had been intensely active in Quaternary,it is characterized by dominant dip-slip and partly dextral movement component and the displacement of the proluvium fans developed at the valley mouth of a gully.The samples collected from the top of the proluvium fans were dated by Thermo luminescence to be 197.18±16.76 B.P.to 33.33±2.83 B.P.The horizontal slip rate of the middle segment of Enshi fault is determined to be 0.43-0.5 mm/a,and the vertical slip rate is determined to be 0.07-0.17 mm/a.
出处
《大地测量与地球动力学》
CSCD
北大核心
2011年第1期39-43,共5页
Journal of Geodesy and Geodynamics
基金
中国地震局地震研究所所长基金(IS200756048)
关键词
恩施断裂
滑动速率
第四纪
构造地貌
洪积扇
Enshi fault
slip rate
Quaternary
tectonic landforms
proluvium fan
