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

doi:10.12068/j.issn.1005-3026.2017.05.027

Abstract

Abstract:

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.

Key words: microseismic monitoring, automatic picking of first arrival time of P-wave, method of STA/LTA, Matlab

CLC Number:

P315

LIU Xiao-ming， ZHAO Jun-jie， WANG Yun-min， PENG Ping-an. Automatic Picking of Microseismic Events P-wave Arrivals Based on Improved Method of STA/LTA[J]. Journal of Northeastern University:Natural Science, 2017, 38(5): 740-745.

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