Geometric structure and formation mechanism of Lintong-Chang’an fault zone

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• 作者：Ya-qin Shi (1)
  Xi-jie Feng (1)
  Wang-qiang Dai (1)
  Xiao-ni Li (1)
  Jun Ren (1)
  Jin Chong (1)
  
• 关键词：Lintong ; Chang’an fault ; tension stress ; outstretching rift system ; listric normal fault ; P315.2
• 刊名：Earthquake Science
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：21
• 期：2
• 页码：156-169
• 全文大小：1137KB
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• 作者单位：Ya-qin Shi (1)
  Xi-jie Feng (1)
  Wang-qiang Dai (1)
  Xiao-ni Li (1)
  Jun Ren (1)
  Jin Chong (1)
  
  1. Earthquake Administration of Shaanxi Province, Xi’an, 710068, China
  
• ISSN：1867-8777

文摘

The results from investigation of large quantity of fault outcrops and artificial earthquakes suggest that the Lintong-Chang’an fault zone mainly consists of two faults. One is the Majie-Nianwan fault that separates a branch of Wangjiabian-Houjiawan fault on the right bank of the Bahe River; the other is the Hujiagou-Shoupazhang fault that separates a branch of Zhongdicun-Tangjiazhai fault in Tongrenyuan and Shaolingyuan. As tensional dip-slip normal faults, the faults distribute with approximately parallel equal intervals in local regions and the profiles drop in a step-like form to the northwest, presenting a Y-shape combination. The result from deep seismic reflection indicates that the fault is about 5 km in depth, which is not only a basement fault, but also a listric normal fault in the deep stratum. The Lintong-Chang’an fault is a typical outstretching rift system under the NS-trending tension stress field. At the same time, affected by the sinistral strike slip of the Yuxia-Tieluzi fault, the fault extends like a broom from the northeast to the southwest.