Tectonic characteristics of the Lishan Piedmont Fault in the SE Weihe Graben (central China), as revealed by the geomorphological and structural analyses
Tectonic characteristics of the Lishan Piedmont Fault in the SE Weihe Graben (central China), as revealed by the geomorphological and structural analyses
复制标题
地貌和构造分析揭示的渭河地堑东南部骊山山前断裂的构造特征
DOI：
10.1016/j.geomorph.2017.01.014
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发表时间：
2017-04
期刊：
影响因子：
3.9
通讯作者：
Lin Aiming
中科院分区：
文献类型：
--
作者：
Rao Gang;Cheng Yali;Yu Yangli;Yan Bing;Lin Aiming
测定了中国中部渭河地块东南段近EW向历山山前断裂的断裂运动学、滑动速率和古地震活动。地貌分析、野外调查和~(14)C年龄测定的结果表明：(1)观测到的三角面的倾角集中在20°左右；(2)经验关联式得出的垂直滑动速率(甩动率)为~0.11~0.25亿mm·−~(-1)，低于邻近的活动断裂；(3)LpF的特征是几乎为纯正滑动，在过去~1万8千年内活动。这些发现可以为人口稠密的西安(中国的故都)及其周边地区的地震危险性评估提供依据。然而，我们建议对断层滑动速率进行更精确的约束，并对最近一次地震的时间和古地震的重复时间进行详细的古地震学研究，以更好地了解活动LPF的孕震行为。
The fault kinematics, slip rate and paleoseismicity along the approximate EW-trending Lishan Piedmont Fault (LPF) in the SE Weihe Graben, central China have been determined. The results of geomorphological analysis, field investigations and radiocarbon (14C) age dating indicate that: (i) slope angles of the observed triangular facets cluster around 20°; (ii) empirical correlations yield a vertical slip rate (throw rate) of ~ 0.11–0.25 mm yr− 1, which is lower than the neighboring active faults; (iii) the LPF is characterized by almost purely normal slip, and was active within the past ~ 18,000 yr. These findings can provide a basis for the assessment of seismic risk in and around the densely-populated city of Xi'an (an old capital of China). However, we suggest more precise constraints on the fault slip rate and detailed paleoseismological studies on the timing of the most recent earthquake and the repeat time of paleo-earthquakes are needed in order to better understand the seismogenic behaviors of the active LPF.
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影响因子：
2.9
作者：
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