A new method for non-stationary signal analysis, local characteristic-scale decomposition (LCD), was applied to analysis of micro-seismic signals to overcome the difficulties in differentiation of micro-seismic signals in mines and improve differentiation efficiency. With LCD, a complicated signal self-adaptively decomposes into a number of intrinsic scale components (ISC), whose instantaneous frequencies have physical significance. Compared with the conventional empirical mode decomposition method, LCD method has higher computational efficiency and better restriction of end effects. The results show that it was effective to use LCD to decompose typical micro-seismic signals of rock fracture and blast vibration signals in mines. Frequency spectrum analysis of each ISC shows that the two kinds of signals had significant difference in frequency distribution, and Hilbert transformation of each ISC shows that they also had significant difference in energy distribution. This method provides a new approach to rapid and accurate differentiation of micro-seismic signals.
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