Abstract:The traditional active source surface wave instrument adopts tapered velocity geophone, which has the disadvantages of a narrow frequency band and low longitudinal resolution. Traditional devices need to manually move the geophone one by one to move the measuring points, which is inefficient and unable to quickly acquire high-density surface wave data at low cost, resulting in low lateral resolution. This paper proposes a towed seismic surface wave data acquisition method that can adapt to the hardened road. A linear string and array towed gravity coupling accelerometer geophones are designed to realize the acquisition of high-density, small geophone spacing, high sampling rate, and broadband data. The influence of sampling rate on the detection accuracy of surface waves is ignored in traditional detection. This paper proposes that the high sampling method can improve the accuracy of surface wave detection. The analysis results of different sampling rates between model data and measured data show that high sampling can suppress noise interference, enhance the low-frequency energy, and ensure sufficient investigation depth. The surface wave data collected by the geophone in this paper, the variations of velocity layers can be described in sufficient depth, and the potential collapse location can be identified. The application of towed seismic geophone to urban road collapse detection embodies the advantages of efficient acquisition and fine detection.