Fractal behaviour of microseismic energy associated with mining-induced tremors

ABSTRACT According to the real-time monitoring data from N1202 island workface of Yuwu coal mine, in Shanxi Province of China, the microseismicity is studied during the actual mining process in the field, the moment magnitude and energy distribution of microseismic events are obtained, the source locations of mining tremors caused by 3 large magnitude microseismic events are determined, and the moment magnitude and energy are calculated. Based on fractal and chaos theory, the mutual information method is introduced to compute the delay time of time series of microseismic energy, the G-P algorithm is introduced to calculate the fractal dimensions of mining tremors with different energy, which is in a declining trend and the lowest on the day of mining tremors. The moment magnitude, energy and fractal behavior of energy under different mining tremors will provide a valuable reference to the early warning of mine dynamic disaster.