Study on Spreading Route of Micro-Seismic Initial Arrival Wave in Rock Strata

In order to rationally explain the spreading route of the micro-seismic initial arrival waves in the strata and to improve the monitoring and measuring accu racy of the micro-seismic monitoring and measuring system, from the abnormal phenomena of the site micro-seismic spreading, with the basis theory of the seismic wa ve, a model was established individually with the spreading way and route of the seismic initial wave in a single rock stratum and the interface of the passed rock strata. The analysis on the spreading route of the micro-seismic initial arrival wave when the seismic sources and the seismic collector in a same rock stratum or not in a same stratum as the initial wave passing the interface of the rock strata.Based on the circumstances, the seismic collector layout principle of the micro-seismic monitoring an d measuring system was optimized.With the site correction, the horizontal directional position error of the micro-seismic monitoring and measuring system could be red uced from 37.5 m before optimized to 5.7 m and the vertical directional position error could be reduced from 33.4 m to 3.0 m.thus the abnormal phenomena of the micro -seismic spreading was solved in certain degree.