横波反射与纵波折射联合勘探在隐伏断裂探测中的应用  

Application of Joint Exploration by S-wave Reflection and P-wave Refraction in Detecting Buried Faults

作　　者：彭刘亚[1] 疏鹏 冯伟栋[1] Peng Liuya;Shu Peng;Feng Weidong(Anhui Earthquake Risk Prevention Center,Anhui Earthquake Agency,Hefei Anhui 230031,China)

机构地区：[1]安徽省地震局安徽省震灾风险防治中心,安徽合肥230031

出　　处：《工程地球物理学报》2022年第6期835-842,共8页Chinese Journal of Engineering Geophysics

基　　金：六安市防震减灾专项(编号:2014HA197)。

摘　　要：在部分超浅覆盖层地区的隐伏断裂探测中,仅通过浅层纵波勘探无法获取有效的基岩面反射波,从而难以判断断裂的位置和上断点的埋深。本文以六安地区的肥西-韩摆渡断裂为例,通过现场纵横波扩展排列测试,确定测区范围内纵波反射特征不明显,因此优先采用浅层横波反射波法获取基岩顶界面的反射波,初步确定断裂的大致位置。仅依赖反射信息无法确定断裂在水平方向的具体位置,因而在上断点附近补充进行了纵波折射勘探,获取了断裂两侧基岩的纵波速度差异信息,最终确定了断点的具体位置和断裂的空间分布形态,与地质推断结果基本一致。研究结果表明,横波与折射波联合勘探法在浅覆盖层地区的隐伏断裂探测工作中,可作为纵波反射法的有力补充,能够获取更详细的断裂特征信息。In the detection of buried faults in some ultra-shallow overburden areas,it is difficult to determine the fault location and burial depth of up-breakpoint only by P-wave exploration for the reason of non-effective reflection wave of bedrock surface.In this paper,as the target,fault Feixi-Hanbaidu in Lu’an district is detected with S-wave refection exploration to approximately obtain its location on the basis of field experiments on both P-wave and S-wave reflection methods.Since P-wave reflection is hardly recognized,P-wave refraction survey is undertaken alongside the up-breakpoint to achieve the significant difference from bedrock P-wave velocity on either side of the fracture,assisting to identify the more explicit explanation of the horizontal location of the target fault.The results indicate that the strike and the characteristics of the fault are similar to the existing known geological speculation.Therefore,joint exploration with both S-wave reflection and P-wave refraction could be an appropriate supplement to acquire more specific information for the detection and identification of the target fault.

关 键 词：浅覆盖层 横波反射 折射波 联合勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]