THE STRUCTURAL CHARACTERISTICS OF PANGUSI-XINXIANG FAULT IN THE SOUTHERN MARGIN OF TAIHANG MOUNTAINS |
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| Authors: | QIN Jing-jing ZHAO Cheng-bin LIU Ming-jun TAN Ya-li ZUO Ying LIU Ying-ying |
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| Affiliation: | Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China |
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| Abstract: | Pangusi-Xinxiang Fault is a great-scale, deep-incising buried active fault in the southern margin of the Taihang Mountains. In order to find out the location, characteristics, structure and activities of Pangusi-Xinxiang Fault, shallow reflection profiles with six lines crossing the buried faults were carried out. In this paper, based on the high-resolution seismic data acquisition technology and high-precision processing technology, we obtained clear images of underground structures. The results show that Pangusi-Xinxiang Fault is a near EW-trending Quaternary active fault and its structural features are different in different segment. The middle part of the fault behaves as a south-dipping normal fault and controls the north boundary of Jiyuan sag; The eastern part of the fault is a north-dipping normal fault and a dividing line of Wuzhi uplift and Xiuwu sag. The shallow seismic profiles reveal that the up-breakpoint of the Pangusi-Xinxiang Fault is at depth of 60~70m, which offsets the lower strata of upper Pleistocene. We infer that the activity time of this fault is in the lower strata of late Pleistocene. In this study, not only the location and characteristics of Pangusi-Xinxiang Fault are determined, but also the reliable geological and seismological evidences for the fault activity estimation are provided. |
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| Keywords: | the southern margin of Taihang Mountains Pangusi-Xinxiang Fault Wuzhi Fault the shallow seismic profile |
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