THE STRUCTURAL CHARACTERISTICS OF PANGUSI-XINXIANG FAULT IN THE SOUTHERN MARGIN OF TAIHANG MOUNTAINS

doi:10.3969/j.issn.0253-4967.2016.01.010

Abstract

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.

Key words: the southern margin of Taihang Mountains, Pangusi-Xinxiang Fault, Wuzhi Fault, the shallow seismic profile

摘要：

盘谷寺-新乡断裂是太行山南缘1条规模较大、切割较深的隐伏活动断裂。为了查明盘谷寺-新乡断裂的位置、性质、断裂构造特征及其活动性,跨推测的隐伏断裂布设了6条浅层地震测线,通过采用高分辨率地震数据采集技术和高精度的数据处理方法,获得了清晰的地下结构和断裂构造图像。结果表明,盘谷寺-新乡断裂是1条走向近EW的第四纪活动断裂,且断裂不同段的构造特征是不同的。断裂中段为S倾的正断层,控制了济源凹陷的北边界;东段向N倾,是武陟隆起和修武凹陷的分界断裂。浅层地震剖面揭示的断裂上断点埋深为60~70m,错断了上更新统下部,推测其活动时代为晚更新世早期。研究结果为确定盘古寺-新乡断裂的位置及其活动性评价提供了可靠的地震学资料。

关键词: 太行山南端, 盘谷寺-新乡断裂, 武陟断裂, 浅层地震剖面

CLC Number:

P315.2

QIN Jing-jing, ZHAO Cheng-bin, LIU Ming-jun, TAN Ya-li, ZUO Ying, LIU Ying-ying. THE STRUCTURAL CHARACTERISTICS OF PANGUSI-XINXIANG FAULT IN THE SOUTHERN MARGIN OF TAIHANG MOUNTAINS[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(1): 131-140.

秦晶晶, 赵成彬, 刘明军, 谭雅丽, 左莹, 刘英英. 太行山南端盘谷寺-新乡断裂的构造特征[J]. 地震地质, 2016, 38(1): 131-140.

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