综合多频率地质雷达天线探测活断层浅层结构—以玉树活动断裂为例

张迪; 吴中海; 李家存; 刘绍堂; 王果

doi:10.12090/j.issn.1006-6616.2019.25.06.097

综合多频率地质雷达天线探测活断层浅层结构—以玉树活动断裂为例

doi: 10.12090/j.issn.1006-6616.2019.25.06.097

张迪^1,,
吴中海²,
李家存^3, ,,
刘绍堂¹,
王果¹

1.
河南工程学院土木工程学院, 河南郑州 451191
2.
中国地质科学院地质力学研究所, 北京 100081
3.
首都师范大学资源环境与旅游学院, 北京 100048

基金项目:

国家自然科学基金项目 U1704124

中国地质调查局项目 1212011120163

中国地质调查局项目 12120114002101

河南省重点研发与推广专项 182102310001

河南省重点研发与推广专项 192102310001

河南省高等学校重点科研项目 19A420007

河南省社会科学规划项目 2016BJJ010

详细信息

作者简介:
张迪(1987-), 男, 博士, 讲师, 主要从事三维信息获取与地质应用。E-mail:zhangdi1987228@163.com

通讯作者:
李家存(1974-), 男, 博士, 副教授, 主要从事遥感技术应用与研究。E-mail:lijiacun@cnu.edu.cn

中图分类号: P546;P631
计量
- 文章访问数: 398
- HTML全文浏览量: 132
- PDF下载量: 31
- 被引次数: 0
出版历程
- 收稿日期: 2019-05-21
- 修回日期: 2019-09-04
- 刊出日期: 2019-12-28

THE APPLICATION OF MULTI-FREQUENCY GPR ANTENNA FOR IMAGING THE SHALLOW SUBSURFACE FEATURES IN THE YUSHU ACTIVE FAULT

1.
College of Civil Engineering, Henan Institute of Engineering, Zhengzhou 451159, Henan, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
3.
College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China

摘要

摘要: 地质雷达技术具有操作性强、分辨率高、探测深度深、对地表环境无破坏和可重复探测等特点，在活断层探测中具有很大的优势。为验证综合多中心频率地质雷达天线探测活断层地下浅层结构效果，以民主村处发育的玉树活动断裂为研究对象，采用25 MHz、100 MHz、250 MHz和500 MHz中心频率的地质雷达天线对活断层浅层结构进行探测，并与探槽剖面进行效果对比。研究结果表明：低中心频率的地质雷达天线（25 MHz和100 MHz）可获取大范围内深度较深（约32 m）的活断层地下浅层结构的整体形态，从雷达图像上可识别出主断层分布范围、断层倾向及地下浅层结构等；而中高中心频率的地质雷达天线（250 MHz和500 MHz）则可获取局部范围内深度较浅（约3 m）的地下浅层结构，尤其是500 MHz天线。探测结果与地表构造地貌形态和探槽剖面地质构造一致，表明综合多中心频率地质雷达天线探测玉树活动断裂浅层结构的有效性和适用性，为活断层研究提供多尺度数据及方法支持。
- 地质雷达 /
- 玉树活动断裂 /
- 多中心频率天线 /
- 地下浅层结构
Abstract: Ground Penetrating Radar (GPR) has the characteristics of strong operability, high resolution, deep detection depth, no damage to the surface environment and repeatable detection, so it is widely-used in active fault detection. In order to assess the effects of GPR for imaging the shallow subsurface geometry in active fault, the 25 MHz, 100 MHz, 250 MHz and 500 MHz GPR frequency antenna were firstly conducted on the Minzhu site of the Yushu active fault zone for the fault detecting. Moreover, the multi-frequency GPR profiles were compared with the three trench section, which were excavated by the previous researches. The research results show that:the low GPR frequencies (25 MHz and 100 MHz) were applied to delineate an excellent general view of deformation zones at a much wider area and greater depth (up to 32 m). The distribution and the direction of the active fault and the horst structure can be deduced on the GPR profiles. The high GPR frequencies (250 MHz and 500 MHz) provided more detailed analysis of the shallow subsurface geometry within 3 m depth. The GPR results are consistent with the surface morphology and trench wall, and the result show that multi-frequency GPR antenna is valuable for imaging the shallow subsurface geometry of the Yushu acive fault, and also provide multi-scale data and method for active fault study.
- GPR /
- the Yushu active fault /
- multi-frequency antenna /
- subsurface geometry
注释:

责任编辑：吴芳

HTML全文

图 1 地质雷达工作原理示意图

Figure 1. The principle of ground penetrating radar

下载: 全尺寸图片幻灯片

图 2 研究区地质概况

Figure 2. Geological survey of the Yushu active fault zone

下载: 全尺寸图片幻灯片

图 3 研究点地貌概况及GPR测线剖面

Figure 3. Geomorphologic overview of the study area and the GPR survey lines

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图 4 不同中心频率地质雷达天线的数据采集方式

Figure 4. Data acquisition of different frequency GPR antennas

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图 5 GPR图像处理流程

Figure 5. Flow chart of GPR data processing

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图 6 25 MHz、100 MHz、250 MHz和500 MHz二维剖面图

Figure 6. The 2D profiles of 25 MHz, 100 MHz, 250 MHz and 500 MHz

下载: 全尺寸图片幻灯片

图 7 500 MHz地质雷达剖面与探槽剖面图(南侧断层陡坎)

Figure 7. The 500 MHz GPR profile and the trench wall of the fault scarp in the south of the study site

下载: 全尺寸图片幻灯片

表 1 地质雷达剖面位置及天线采集参数

Table 1. The location and acquisition parameters of different GPR antennas

GPR测线剖面	开始位置经度/维度	结束位置经度/维度	剖面长度/m	天线类型	天线频率/MHz	道间距/m	时间窗口/纳秒
测线1	32.9871°/96.9990°	32.9886°/96.9998°	140	RTA	25	0.3	1750
测线2	32.9879°/96.9993°	32.9883°/97.0000°	71	RTA	100	0.1	553
测线3	32.9879°/96.9993°	32.9883°/97.0000°	71	屏蔽天线	250	0.05	160
测线4	32.9879°/96.9993°	32.9883°/97.0000°	71	屏蔽天线	500	0.02	80

下载: 导出CSV

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