PDF(3014 KB)
Detection of Low Velocity Geological Anomalous Body Using Surface Wave Transverse High Resolution Technology
Sun Xu, Zhang Xueqiang, Liu Bozheng
PDF(3014 KB)
PDF(3014 KB)
Detection of Low Velocity Geological Anomalous Body Using Surface Wave Transverse High Resolution Technology
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.
surface wave / phase difference / linear Radon transform / low velocity anomalous body / earthquakes / geological engineering
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