Application of P_d-τ_c compatibility criterion to distinguishing triggered events

Combining the operation status of the earthquake early warning (EEW) system in Fujian Province， this paper discusses the feasibility of the P_d-τ_c compatibility criterion in discrimination of triggered events， based on seismic records of KiK-net in Japan and seismic monitoring networks of Fujian Province， in which both spontaneous earthquakes and artificial explosion events are included. The results show that， for large local earthquakes and false triggering events， P_d-τ_c criterion is quite reliable with less error. Also， teleseismic earthquake events may be roughly judged by the criterion. But artificial explosions and/or small magnitude local earthquakes cannot be effectively distinguished only by this criterion. Furthermore， based on the P_d-τ_c compatibility test results， this paper sets an intensity test standard by the parameter P_d=10^-3 cm， by which those destructive earthquakes can be identified more accurately. The present method will help to improve the reliability of triggered events discrimination， promote processing efficiency of the whole EEW system， eventually generate more accurate seismic alert message.