A Shallow Underground Seismic Source Location Method Based On TDOA-DOA Multi-information Fusion

The underground shallow seismic source positioning technology is an important method in the field of microseismic monitoring such as mining,engineering blasting,and hydraulic fracturing.Due to the complexity of shallow underground media and serious waveform aliasing,the location accuracy of underground seismic sources is not high.Aiming at the requirement of high-precision measurement of the source location,this paper carried out a research on the location method of underground shallow source based on the fusion of multiple information of Time Difference of Arrival(TDOA)and Direction of Arrival(DOA).First,because of the good polarization characteristics of the explosive near-field P-wave,constructing a TDOA-DOA hybrid positioning model by introducing its polarization angle information into the travel time positioning model;second,in order to reduce the error of the first arrival information extraction,the introduction of higher-order statistics enhances the catastrophic nature of time-varying signals.And that therefore improves the energy ratio algorithm for long and short time windows(STA/LTA);then using the F-K(frequency-wavenumber)analysis method to extract the velocity information and propagation direction information of the vibration field;again,based on standard particle swarm optimization(PSO),Attractive-diffusion particle swarm(ARPSO)and quantum particle swarm(QPSO)optimization solution methods for seismic source positioning models,using convergence speed and solution accuracy as indicators to simulate the positioning accuracy of the above algorithm.Finally,experiments were carried out in the field and further discussions were conducted on the optimization of sensor placement and positioning errors.The test results show that the proposed method of TDOA-DOA multi-information fusion of shallow underground source location effectively improves the accuracy of seismic source location and has certain theoretical significance in the orientation of shallow underground source location.It has certain engineering application value in the fields of underground minemonitoring,tunnel mining,and the location of the bombing point.