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| A microseismic source location method considering refraction of seismic waves in layered media |
| XU Gang1，2，XUE Chuanrong1，WANG Xinke1，GAO Dejun1，2 |
| (1. College of Civil Engineering and Architecture，China Three Gorges University，Yichang，Hubei 443002，China；2. Hubei Key Laboratory of Disaster Prevention and Mitigation，China Three Gorges University，Yichang，Hubei 443002，China) |
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Abstract The existing microseismic source location methods assume that the seismic wave propagates along straight lines，and the positioning results often fail to meet the accuracy requirements. In this paper，a new location method of microseismic source named as minimum travel time surface method of seismic wave was established. This method considers Snell¢s law of seismic wave propagation and assumes seismic wave minimum travel path ray propagation plane. By rotating the coordinate system，the three-dimensional propagation path of seismic waves can be transformed into a two-dimensional plane propagation path，and the relatively accurate calculation of initial arrival and travel time of micro-earthquakes in parallel layered rock mass can be realized. The improved genetic algorithm was used to optimize the microseismic source in the three-layer horizontal model to verify the validity of the hypothesis，and the factors affecting the positioning accuracy were analyzed. The results show that the travel time obtained by the minimum travel time surface method is significantly better than that obtained by the traditional shortest geometric path travel time calculation method，and that the difference between them is a function of the inclinationand the distance L of the connection line between the microseismic source and the sensor. The new location method has a great positioning accuracy in multi-layer media and the positioning accuracy is not affected by the wave velocity ratio of the medium.
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2021, Vol. 40 
