地震预警信息可靠度研究

Reliability research of earthquake early warning information

提出了一种地震预警信息可靠度检验方法.针对地震预警系统对信息的高度时效性及准确性要求,并结合其应用特点,从地震动记录信噪比、特征参数相容性、特征参数协调性及地震预警定位结果可靠性等4个方面对地震预警信息的综合可靠度进行探讨,并分别提出了相应的可靠度定量计算方法.利用日本KiK-net台网记录的444个地震事件共4 737条三分向加速度记录对上述4个指标参数及综合可靠度指标参数的验证结果表明,采用本方法有助于提高地震预警信息发布的准确性和可靠性,减少"漏报"及"误报"事件的发生.

The earthquake early warning system （EEWs）has highly require-ments 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 asτc and Pd ）compat-ibility test,characteristic parameters coordination test and EEW location relia-bility test.For each test,a quantitative calculation formula is defined,and then the reliability of the entire information can be calculated.4 737 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.