Micro-seismic source location determined by a modified objective function

Abstract

The exact localization of micro-seismic sources is of significant importance in micro-seismic monitoring technology. The methods determining arrival time and time difference of micro-seismic source locations in engineering are introduced. The factors affecting the accuracy of the micro-seismic source location are analysed. To improve the accuracy of micro-seismic source localization, an objective function is used to examine the source, and a new method for locating micro-seismic sources is proposed. To make full use of the monitoring data of each geophone, the L2-norm and variance function are combined to improve the overall accuracy of the positioning and the stationarity of the objective function of each geophone equation. Finally, a particle swarm optimization is employed to search for the source location. The effectiveness of the improved method is verified by two case studies, and the results indicate that the proposed method is better than conventional approaches. The proposed method is simple and easy to perform.