In order to analyze the microseismic (MS) effects of hard and thick igneous strata separation and fracturing and the corresponding evaluation index of fracturing intensity, the temporal-spatial evolution of the MS sources generated by igneous strata fracturing in the 10416 working face of the Yangliu coal mine (YCM) was dynamically recurred, and the waveform and frequency-spectrum distribution characteristics of primary and igneous strata fracturing were clearly investigated, respectively. In addition, the relationship between the MS dominant frequency, the energy ratio in low-frequency band and the intensity of igneous strata fracturing was revealed, and the energy ratio of MS event in low-frequency band can be verified as an effective index for evaluating roof fracturing intensity. The work may put forward a certain reference for early warning and evaluating hard and thick roof fracturing and the induced coal-rock dynamic disasters based on in-situ MS observation. (C) 2016 Elsevier B.V. All rights reserved.