Microseismic Signal Classification Based on Artificial Neural Networks

Figure 2

Waveform and spectrum of microseismic signal. (a) Waveform with a sampling frequency of 1000 Hz. (b) Spectrum of signal. is the upper-frequency limit in LAR calculation, and the corresponding green band is the spectrum window of low frequency. The pink band is the window with peak frequency inside, with and which are the upper and lower limits of the window. The yellow band indicates the signal part judged by the threshold, with and which are lower and upper limits of the band.

(a)

(b)