宁南县主城区活断层探测及活动性研究

发布时间：2018-03-25 20:32

本文选题：活断层　切入点：EH4法　出处：《西南交通大学》2016年硕士论文

【摘要】：存在于城市下面隐伏的活动断层所引发的直下型地震会对城市产生极为严重的破坏,因此对城市中的活断层进行探测并进行稳定性分析,可以准确了解活断层的分布和危害性,为科学地规划城市建设,提供一定的理论依据。宁南县处于新构造运动比较活跃的地区,为破坏性地震活动区域。因此,对宁南县主城区活断层进行探测和活动性分析具有重要意义,本文研究内容如下：(1)针对宁南县主城区的地质背景,结合现阶段常用活断层探测方法,分析每种方法的基本原理和适用性,本文提出以ETM遥感图像分析和现场调查的方法为初步探测方法,EH4法和放射性分析为详细探测方法的一套综合探测方法。为相似的工程探测提供依据。(2)通过对宁南县主城区的初步探测得到,宁南县主城区西南方向主要受大同断裂控制,而北东方向主要受松新断裂控制,其他其它断裂延伸距离较小,发生断裂的可能性小,且其第四系又无活动特征,可判定为非活动断层。为初步探测结果为详细探测探测做一定的理论依据。(3)通过采用EH4法和放射性分析方法结果的相互比对,以及钻探结果进行验证,结果表明EH4法和放射性分析方法适用于宁南县主城区活断层进行探测。并分别布置测线对其进行详细探测,进一步得到大同断裂和松新断裂的分布特征。(4)通过对潜在震源区的划分,确定潜在震源区和背景震源地震活动性参数。本文在研究过程中,由于时间和设备的限制,未进行大量试验对比分析。
[Abstract]:The vertical earthquake caused by the hidden active fault under the city will cause extremely serious damage to the city. Therefore, the active fault in the city can be detected and the stability analysis can be carried out in order to accurately understand the distribution and harmfulness of the active fault. For the purpose of scientifically planning urban construction and providing certain theoretical basis, Ningnan County is located in an active area of neotectonic movement and is a destructive seismicity area. It is of great significance to detect and analyze active faults in the main urban areas of Ningnan County. The contents of this study are as follows: (1) in view of the geological background of the main urban areas of Ningnan County, combined with the active fault detection methods commonly used at the present stage, Analysis of the basic principles and applicability of each method, In this paper, a set of comprehensive detection methods using ETM remote sensing image analysis and field investigation as primary detection methods and radioactivity analysis as detailed detection methods are put forward, which provide a basis for similar engineering exploration. A preliminary survey of the county's main urban area shows that, The southwest direction of the main urban area of Ningnan County is mainly controlled by Datong fault, while the north to east direction is mainly controlled by Songxin fault. The other faults have small extension distance, the possibility of fault occurrence is small, and the Quaternary system has no active characteristics. It can be determined as an inactive fault. The theoretical basis for the preliminary detection results for the detailed detection is made. The results of the EH4 method and the radioactivity analysis method are compared with each other, and the drilling results are verified. The results show that EH4 method and radioactivity analysis method are suitable for the detection of active faults in the main urban area of Ningnan County. The distribution characteristics of Datong fault and Songxin fault are further obtained.) by dividing the potential source area, the seismicity parameters of the potential source area and the background source are determined. In this paper, due to the limitation of time and equipment, the seismic activity parameters of the potential focal area and the background source are determined. A large number of tests were not carried out.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P315.6

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