276 / 2018-04-24 19:07:13

Automated determination and optimization method of microseismic P-phase arrival times in steps

arrival time picking,microseismic,band pass filtering,AIC,MER

矿山动力灾害 > 岩爆冲击

We present an algorithm for P-phase arrival time automatic determination and optimization for seismic events of coal mine in steps. For P-phase detection we apply four modules: single denoising (band-filter), fast searching (STA/LTA and peak value), accurately picking (AIC and MER) and optimization selection (time difference of arrival time and envelope circle judgment). This method is applied for a precise determination of P-phase arrival time, in additional, an automatic quality estimate is obtained to optimize and select the effective stations and be used for source location. Through the analysis and validation of seismic data in a mine located in Hebei province, the result shows that this method can pick up the first arrival time of MS signal fast and accurately, and automatically judge and remove the error station. Compared manual and automatic picks in terms of speed and accuracy, computation cost (0.039 s) is far less than manual method (3 min), precision of manual and automatic represented by picking error of between -10 ms and 10 ms is up to 62.5%. This study shows, that the method presented in this paper is feasible to precise automatic P-phase determination, and is a basis on automatic and precision location.