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  苏鹏,田勤俭,李文巧,熊仁伟,李小强,梁朋,付俊东.地质雷达在活动断裂研究中的应用[J].震灾防御技术,2015,10(2):281-290, DOI:10.11899/zzfy20150208.

地质雷达在活动断裂研究中的应用
摘要:    对于快速发生沉积和侵蚀的地区,断裂附近的古地震遗迹会很快被掩埋。获取这些地区断裂的位置、上断点的埋深和标志层的断距等方面的数据至关重要。本文利用地质雷达探测技术探测这些被埋藏的古地震遗迹。以北京平原区正断性质的新夏垫断裂和青藏高原东北缘六盘山地区逆冲性质的六盘山东麓断裂为实验区。通过探测发现,对于断裂两侧地表覆盖层主要为粉土或粉质粘土的新夏垫断裂,地质雷达可精确定位断裂通过的位置,指示上断点的埋深,但无法在地质雷达剖面上识别出各套地层。对于在T1基座阶地上通过的六盘山东麓断裂,地质雷达不但可以精确定位断裂的位置,而且可以在地质雷达剖面上识别出各套地层,进而求得断裂两侧基座的断距。
作者单位
苏鹏 地震预测重点实验室中国地震局地震预测研究所北京100036 
田勤俭 地震预测重点实验室中国地震局地震预测研究所北京100036 
李文巧 地震预测重点实验室中国地震局地震预测研究所北京100036 
熊仁伟 地震预测重点实验室中国地震局地震预测研究所北京100036 
李小强 地震预测重点实验室中国地震局地震预测研究所北京100036 
梁朋 地震预测重点实验室中国地震局地震预测研究所北京100036 
付俊东 山东省地震局济南250014 
关  键  词:地质雷达  活动断裂  新夏垫断裂  六盘山东麓断裂  探槽选址  断距
DOI:10.11899/zzfy20150208
基金项目:中国地震局地震预测研究所基本科研业务费专项“六盘山构造带晚第四纪构造变形特征研究”(2012IES010304)、“首都圈西部盆岭构造区强震危险性地点研究与危险性综合分析”(0210240205)、“中国地震活断层探查——南北带中南段”(60112304)项目共同资助
收稿日期:2014-11-18
作者简介:苏鹏,男,生于1989年。硕士研究生。主要从事地震构造方面的研究。E-mail: supengzhenhao@qq.com
通讯作者:
Application of Ground Penetrating Radar in the Study of Active Faults
Abstract:      For some areas where sedimentation and erosion complete are at fast rates, marks of paleoearthquakes on faults may be buried below the surface. However, it is important to know the location, displacement and other aspects of the fault. We apply ground penetrating radar (GPR) technology to investigate the buried traces of a paleoearthquake. We choose the new Xiadian fault which is a normal fault located in Beijing Plain, and the eastern Liupanshan piedmond fault which is a reverse fault located in the northeastern margin of the Tibetan Plateau as two experimental areas. We found that, at the site of the new Xiadian fault which is mainly covered by silt or silty clay, the GPR can accurately detect the location and the depth of the breakpoint of the new Xiadian fault, but it cannot image layers at the each side of the fault. At the site of the eastern Liupanshan piedmond fault where the fault cut the basement of a T1 river terrace, the GPR can not only accurately located the fault, but also image layers at the both sides of the fault, thus we could obtain the fault displacement of the basement of the T1 river terrace.
Keywords:  Ground penetrating radar  Active fault  New Xiadian fault  Eastern Liupanshan piedmond fault  Choice of sites of trenches  Fault displacement
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