Characteristics of late quaternary activity along the Southern Border Fault Zone of Weihe Graben Basin
Characteristics of late quaternary activity along the Southern Border Fault Zone of Weihe Graben Basin
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DOI：
10.1016/1040-6182(94)p3715-k
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发表时间：
1995
影响因子：
2.2
通讯作者：
Anliang Zhang;Zhongtang Yang;Jin Zhong;Fengshou Mi
中科院分区：
文献类型：
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作者：
Anliang Zhang;Zhongtang Yang;Jin Zhong;Fengshou Mi
渭河断陷盆地位于陕西中部，是中朝准地台中的一个次级构造单元鄂尔多斯盆地南缘的构造坳陷。根据1：5万地质填图所揭示的新信息，研究了渭河断陷盆地南缘断裂带的活动历史和特征。该断裂带可分为两段：华山皮埃蒙特断裂;东段为秦岭北方边界断裂，西段为秦岭北缘断裂。研究表明，华山皮埃蒙特断裂的新活动性。自晚第四纪以来就很明显。沿沿着该断裂及其两侧分布着大量的地震变形遗迹，如最新的断层陡坎、基岩裂隙、黄土裂隙、滑坡、山体蠕动等。该断裂极有可能是1556年华县8级大地震的发震断裂带。两条古地震剖面的分析表明，华山地震复发间隔为2000-2500年。而秦岭北方断裂则为2000-4000年。
The Weihe graben basin located in the centre of Shaanxi, China, is a tectonic depression on the southern border of Ordos massif, a subtectonic unit in the Sino—Korean paraplatform. In the light of new information exhibited from geological mapping on the scale of 1:50,000, the active history and the feature of the Southern Border Fault Zone of Weihe graben basin have been researched. The fault zone may be subdivided into two segments: the piedmont fault of Huashan Mt. in the east sector and the northern border fault of Qinling Mts in the west sector. The research shows that new activity of the piedmont fault of Huashan Mt. is obvious since the Late Quaternary. A great number of relics of earthquake deformation, such as the newest fault scarps, bedrock fractures, loess crevices, landslides and mountain creep, are distributed along this fault and its two flanks. This fault is most likely the causative fault zone of the Huaxian great earthquake in 1556 (M = 8). The analysis of two palaeoseismic profiles shows the earthquake recurrence interval is 2000–2500 years for the Huashan Mt. piedmont fault, whereas 2000–4000 years for the northern border fault of Qinling Mts.