Automatic Picking of Microseismic Events P-wave Arrivals Based on Improved Method of STA/LTA

摘要

An improved method of automatic picking P-wave first arrival time based on the method of STA/LTA was put forward. A new kind of characteristic function was established by introducing weighting factor K, the global maximum on the curve of STA/LTA was found, then the corresponding moment is identified as the arrival of P-wave, and Matlab was used to analyze seismic events. Results show that the method can accurately pick up P-wave arrivals of seismic event, and reduce the process of adjusting the trigger threshold ( Thr) to pick up the P-wave of the traditional algorithm ( STA/LTA) , and overcome the shortcoming that a fixed threshold can not pick the arrival time of complex signals. And the method has advantages of strong noise resistance, good stability, etc.

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