综合物探方法在广西罗城县活动断裂鉴定中的应用

doi:10.11720/wtyht.2021.2576

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Abstract

Urban active fault detection plays an important role in the process of urban development and construction and also in ensuring the safety of people's lives and property.In this paper,with the purpose of identifying the activity of Luocheng fault and Shangtianqiao-Simen fault and on the basis of geometry,kinematics and chronology of the fault determined by the seismic geological survey,the authors detected the specific location of the fault that lies at the most likely active segment and is covered by the Quaternary sediments by high-density electrical method and seismic imaging method,which was then verified by drilling arrangement.In addition,the latest active age of the fault was determined through the offset relationship between the fault and the Quaternary overburden.The results show that the location of Luocheng fault and Shangtianqiao-Simen fault in the concealed segment can be accurately detected by the high-density electrical methods and seismic mapping method,and the fault activity age is determined to be the early Pleistocene based on the fact that fracture surface,scratch,cataclasite and structural brecciaa are developed,but the fault does not cut the Quaternary overburden.According to the requirements of relevant specifications,Luocheng fault and Shangtianqiao-Simen fault have not been active since the late Pleistocene,so the construction planning of Luocheng county does not need to take avoidance measures,and the appraisal results provide safety guarantee for the project construction of Luocheng County in the future.

Key words： active fault seismic geological survey high density electrical method seismic imaging drilling arrangement

Received: 13 December 2019 Published: 29 April 2021

ZTFLH:

P631.4

Corresponding Authors: LI Jun-Liang E-mail: wujiaobing@163.com;269653004@qq.com

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	Articles by authors
	Jiao-Bing WU
	Jun-Liang LI
	Lan JIANG
	Jun-Hong LU
	Li-Li PAN
	Wang-Qiu WEI

Cite this article:

Jiao-Bing WU,Jun-Liang LI,Lan JIANG, et al. The application of comprehensive geophysical method to the identification of active faults in Luocheng County,Guangxi[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 346-354.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.2576 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/346

Distribution map of seismic structure in Luocheng County
1—Quaternary system;2—Triassic system;3—Permian system;4—Carboniferous system;5—Devonian system;6—Sinian system;7—Banxi group;8—Magmatic rock;9—earthquake;10—fault zone;11—concealed fault zone;12—geophysical survey line;13—geological survey point;14—drilling row

Field outcrop of Luocheng fault(a),structural section(b) and development of NW horizontal scratches and steps(c)
1—tectonic fracture zone;2—limestone;3—fault zone

Field outcrop in the south section of Shangtianqiao—Simen fault(a),structural section(b) and structural breccia(c)
1—residual clay;2—limestone;3—breccia;4—fracture zone

Field outcrop in the north section of Shangtianqiao—Simen fault(a),structural section(b) and fault plane(c)
1—residual clay;2—limestone;3—breccia;4—fracture zone;5—fracture zone

Survey map of interference wave

Geophysical prospecting results of line A-A'
a—polar distance AO=22.5m multiple section;b—polar distance AO=52.5m multiple section;c—apparent resistivity contour map;d—seismic image waveforms

Geophysical prospecting results of line B-B'
a—polar distance AO=22.5m multiple section;b—polar distance AO=52.5m multiple section;c—apparent resistivity contour map;d—seismic image waveforms

Geophysical prospecting results of line C-C'
a—polar distance AO=35m multiple section;b—polar distance AO=85m multiple section;c—apparent resistivity contour map;d—seismic image waveforms

Geophysical prospecting results of line D-D'
a—polar distance AO=22.5m multiple section;b—polar distance AO=52.5m multiple section;c—apparent resistivity contour map;d—seismic image waveforms

Geophysical prospecting results of line E-E'
a—polar distance AO=35m multiple section;b—polar distance AO=85m multiple section;c—apparent resistivity contour map;d—seismic image waveforms

Drilling profile for each line
a—A-A' line;b—C-C' line;c—D-D' line;d—E-E' line;1—arable soil;2—clay;3—silty clay;4—silt;5—gravelly clay;6—dolomite;7—limestone;8—water filled karst cave;9—clay filled karst cave;10—structural cataclastic rock;11—structural breccia;12—fracture;13—drilling hole

Drilling core for each line
a—A-A' line drilling exposes fracture surface and structural cataclastic rock;b—C-C' line drilling exposes fracture scratch surface and structural breccia;c—D-D' line drilling exposes fracture surface and fault gouge;d—E-E' line drilling exposes fracture surface and structural fracture

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