Detection of Low Velocity Geological Anomalous Body Using Surface Wave Transverse High Resolution Technology
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摘要: 为了能在狭窄空间提高面波的横向分辨能力，利用线性拉冬变换提取地震波记录中的面波，采用相邻两道相位差法计算面波的频散曲线，再用半波长解释方法得到拟二维面波相速度剖面.在随机介质中建立低速异常体模型，在一个短排列的情况下，通过对波动方程有限差分数值模拟的地震波记录进行数据处理，在速度剖面中低速异常体区域明显，位置准确.将此技术应用到郑州市地下防空洞的探测以及黄河大堤渗漏的探测中，寻找到了防空洞的位置及渗水通道.该技术具有很高的横向分辨率，适用于城市狭窄空间地面无损探测.Abstract: In order to improve surface wave in the narrow space of the lateral resolving power, a method is proposed to the two-dimensional surface wave phase velocity profile, firstly using linear Radon transform to extract the surface waves in seismic records, then using two adjacent phase difference method to calculate the surface wave dispersion curves, and finally explaining it with half wave. A model of abnormal body at low speed is established in random medium, in the case of a short order. Through data processing of seismic wave records from finite difference numerical simulation of wave equation, it is found that the area of low-velocity abnormal body in velocity profile is obvious and its location is accurate. This technique has been applied to the detection of underground air-raid shelters in Zhengzhou City and the detection of seepage in the Yellow River levee, and the positions of air-raid shelters and seepage channels have been found. This technique has high lateral resolution and is suitable for non-destructive ground detection in urban narrow space.
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图 3 模型一的地震波记录
a.左边炮原始记录；b.左边炮提取的面波记录；c.右边炮原始记录；d.右边炮提取的面波记录
Fig. 3. Seismic wave recording of model 1
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