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

Abstract：In order to rationally explain the spreading route of the micro-seismic initial arrival waves in the strata and to improve the mo- nitoring and measuring accuracy 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 wave, 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. Rased on the circumstances, the seismic collector layout principle of the micro-seismic moni- toring and measuring system was optimized. With the site eorreetion, the horizontal directional position error of the micro-seismic monito- ring and measuring system could be reduced from 37. 5 m before optimized to 5.7 m and the vertical directional position error could be re- duced from 33.4 m to 3.0 m. thus the abnormal phenomena of the micro-seismic spreading was solved in certain degree.