Reliability research of earthquake early warning information

The earthquake early warning system (EEWs) has highly requirements for information’s timeliness and accuracy. In this paper, we proposed an information reliability test method for EEWs. Based on the EEWs’ application features, this paper proposed four information reliability tests, which are signal to noise ratio (SNR) test, characteristic parameters (such as τ_c and P_d) compatibility test, characteristic parameters coordination test and EEW location reliability test. For each test, a quantitative calculation formula is defined, and then the reliability of the entire information can be calculated. 4737 three-component acceleration records of 444 seismic events from KiK-net in Japan were used in order to test and verify the applicability of our method. The results show that, by taking the reliability tests method proposed in this paper, the accuracy and reliability of the EEW information are improved, and then “missed alarms” or “false alarms” are reduced.