Based on the previous research results and the field measurements, taking Zhuozishan open-pit molybdenum mine as an example, we analyzed the waveform and time-frequency characteristics of five kinds of micro-seismic events in the region. The amplitude, radiation uniformity and frequency variation of the microearthquakes show that the microearthquakes are caused by the single force couple and shear force. The blasting has a upward P wave initial direction, whereas the initial direction of S wave is not easy to identify, characterized with three section changes of initial earthquake, main shock and tail band". The event of small slope landslide belongs to wedge-body landslide, and the total process is composed of several so-called acceleration-buffer terminations, in which the waveform is composed of multiple sets of pulse wave trains with "V" shape of envelope line. The vibration event of mechanical mining is characterized by constant natural vibration energy, great difference in pulse amplitude and uncertain duration interval.
The wave amplitude of the transport vehicle has the shape of "weak-strong-weak", equal frequency and multi-segment spindle shape. The time-frequency spatial distribution can be divided into two categories. The first contains micro-earthquakes, blasting, mechanical mining and small slope landslides, and the second contains only vehicle transport events. The research results provide a reference for the identification of microseismic events in open pit mines.