Location of underground microseismic source based on 3D two-stream network

The detection technology of the microseismic source center of underground damage is mainly used for the location of the underground damage, positioning of explosion point of artillery shells in weapon testing ground. Aiming at the problem that clock error of microseismic acquisition sensor and the lack of high frequency information of acquisition data, this paper proposes a distributed microseismic source location for underground damage based on 3D two-stream network. The method uses spatial scanning to make the low-dimensional vibration wave information highly dimensional, transforms the seismic waveform data from the time domain into the energy domain, and establishes the correspondence between the source center and the high-dimensional energy distribution. Then, the energy domain features are extracted through the 3D-CNN network, and the LSTM network gradually optimizes the focal center region to obtain accurate focal center location. The results show that the source location of underground damage microseismic based on 3D dual-current network is obviously superior to the traditional traveltime-like source location method, and the proposed method has stronger data fitting ability and anti-interference ability in high SNR data. The results of static explosion test in small field show that the proposed method is superior to the traditional method in near field microseismic source location.