NEW EVIDENCES OF THE HOLOCENE FAULT IN SUQIAN SEGMENT OF THE TANLU FAULT ZONE DISCOVERED BY SHALLOW SEISMIC EXPLORATION METHOD

doi:10.3969/j.issn.0253-4967.2016.01.003

Abstract

Abstract:

The fault F₅ is considered as the most active fault in the Tanlu fault zone(Yi-Shu fault zone), which is located from Weifang of Shandong Province to Jiashan of Anhui Province, with a length of 360km. It has always been a focus of concern to many geoscientists because of its complexity and importance. But, for a long period of time, there exists biggish indetermination in the accurate position and active ages of the fault F₅ in Suqian section of Tanlu fault zone. Seismic reflection exploration is the main technique in present urban active faults detecting. In order to investigate the spatial distribution, characteristics and activities of the fault F₅ in covered terrains, we carried out a systematic survey to the fault with shallow seismic prospecting method and obtained the accurate position and development characteristics of the fault. The results show that the fault F₅ continues to develop toward south rather than ending at the Huancheng South Road of Suqian City. F₅ is mainly composed of two main faults, which dip in opposite directions and almost vertically. Near the Sankeshu town, F₅ is composed of three faults with right-stepping, forming a small pull-apart basin with length of 6km, width of 2.5km, controlling the deposition of Neogene and Quaternary strata. By combining the results of composite drilling section and trenching, we make a conclusion that the western branch of fault F₅ is a Holocene active fault, and the eastern branch is a Pleistocene active fault. Our general view is that fault F₅ is a Holocene active fault.

Key words: shallow seismic exploration, Suqian section of Tanlu fault zone, fault F₅

摘要：

郯庐断裂带沂沭段最新活动的断层一般称之为F₅断层,分布于潍坊至嘉山一带,长约360km。郯庐断裂带宿迁段F₅断裂的准确位置、活动时代一直以来存在较大的不确定性。文中通过浅层地震勘探对F₅断裂进行了系统性勘探,获取了准确的定位及其断裂发育特征。结果表明,F₅断裂并未终止于原来认定的宿迁市环城南路处,而是继续向南延伸; F₅断裂主要由2条相向而倾、近直立发育的主干断裂组成;在三棵树乡附近,F₅断裂由3条断裂组成,且呈右阶排列,阶区长度约6km,宽度约2.5km,形成小的拉分盆地,控制了新近纪以来地层的沉积。结合钻孔联合剖面和槽探结果,判断F₅断裂西边界断裂为全新世活动断裂,东边界断裂为晚更新世活动断裂,总体认为F₅断裂为全新世活动断裂。

关键词: 浅层地震勘探, 郯庐断裂带宿迁段, F₅断裂

CLC Number:

P315.2

XU Han-gang, FAN Xiao-ping, RAN Yong-kang, GU Qin-ping, ZHANG Peng, LI Li-mei, ZHAO Qi-guang, WANG Jin-yan. NEW EVIDENCES OF THE HOLOCENE FAULT IN SUQIAN SEGMENT OF THE TANLU FAULT ZONE DISCOVERED BY SHALLOW SEISMIC EXPLORATION METHOD[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(1): 31-43.

许汉刚, 范小平, 冉勇康, 顾勤平, 张鹏, 李丽梅, 赵启光, 王金艳. 郯庐断裂带宿迁段F₅断裂浅层地震勘探新证据[J]. 地震地质, 2016, 38(1): 31-43.

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