Abstract:Based on discussion of Kalman filtering, the algorithm to realize microseismic Kalman filtering was designed in this paper. During the discussion of microseismic wave propagation in fracture and through the analysis of affecting actors for microseismic wave propagation, Absorption and attenuation, the state equation which describes microseismic wave propagation was set up, and in accordance with the characteristics of all kinds of noise during the propagation process of microseismic wave the characteristic regularity for noise change were studied. Regarding two kinds of noise variance initial estimation problems in Kalman filtering, firstly supposing noise and signal not correlated with each other and then studying the state variables based on observed value unbiased estimation theory, at last the two estimation methods were obtained, the two methods are initial noise variance observation method and input noise variance method which is related to state variables. After processing and analyzing theoretical model and real data, the results show that the method is effective and woks well.