Research On High-Precision Scanning And Localization Method Of Shallow Subsurface Multiple Seismic Sources Based On Energy Focusing

The seismic source location technology in shallow underground areas is one of the hot topics in current underground space research,and is often applied in the exploration of underground mineral resources,artificial explosions,and micro-seismic blasting.Currently,seismic source localization technology in shallow underground spaces usually borrows from seismic source exploration technology in deep underground spaces.The method based on energy field localization is a commonly used method that does not require picking the initial arrival time,but requires solving the energy in the region,which has a large computation and low precision of the model.Additionally,because this method mainly solves the deep seismic source localization problem under the conditions of geological uniformity and known velocity,and the underground shallow medium exists in complex and diverse types,random distribution,non-uniform and other phenomena,the velocity parameter can only be set to the average value,resulting in large positioning errors in the search for shallow seismic sources in a large area.In view of the problems in the development of seismic source localization in shallow underground areas mentioned above,this paper proposes a shallow underground seismic source scanning localization method based on energy focusing on the steered response power energy field model.Firstly,a velocity field model in the region is reconstructed by modeling the underground random medium.Then,the sensor signals are preprocessed by denoising using VMD,and the signals are analyzed in the time-frequency domain by generalized weighted S transform to obtain the number of seismic sources and the frequency range of the signals,and the signals are decomposed into time windows to ensure that there is only one seismic source in each time window.Secondly,an optimized controllable response power localization model is established in each time window.Finally,based on the positioning model,an improved quantum particle swarm algorithm was used to search and locate the energy focal points(sources).Under the complex media conditions in shallow underground areas,this provides theoretical support for high-precision multi-source localization of micro-seismic blasting.This paper validates the proposed method through practical experiments.The verification results show that the energy-focusing-based multi-source scanning localization method for shallow underground areas proposed in this paper can effectively improve the localization accuracy and efficiency of shallow underground multi-sources.In a simulation experiment of underground explosions conducted within a 100m*100m*50m area,the RMSE localization error using this method was within 0.0941 m,and the absolute errors of the x,y,and z axes were reduced to within 0.08 m,0.03 m,and 0.03 m,respectively.