Geometric structure and formation mechanism of Lintong-Chang’an fault zone |
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作者姓名: | 师亚芹 冯希杰 戴王强 李晓妮 任隽 种瑾 |
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作者单位: | Earthquake;Administration;Shaanxi;Province;Xi'an;710068;China;Xi’an; |
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基金项目: | Project of “Urban active Fault Testing Detection” supported by the National Development and Reform Commission (20041138) |
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摘 要: | The results from investigation of large quantity of fault outcrops and artificial earthquakes suggest that the Lin-tong-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 5~8 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 ten-sion 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.
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关 键 词: | Lintong-Chang’an fault tension stress outstretching rift system listric normal fault |
收稿时间: | 2008-10-25 |
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