地震研究

为检验天津地震预警系统的可靠性,基于2021年6月15日至2023年12月31日天津地震预警数据处理系统的JEEW和EEW产出的数据,从事件匹配率、预警时效性、首报震级偏差、首报震中偏差等方面,与京津冀地区94次地震事件的正式速报结果进行对比分析。结果表明:JEEW系统首报用时3.8～7.0 s,首报震级偏差0.1～0.7级,首报震中偏差0.6～2.6 km; EEW系统首报用时3.4～7.0 s,首报震级偏差0.0～0.8级,首报震中偏差0.6～2.6 km。综上认为,对于中国地震台网产出的京津冀地区3.0级以上正式速报的地震,天津地震预警系统可产出时效性较强、定位精度较高的结果。

After collecting the data produced by the data processing systems of the Tianjin Earthquake Early Warning System from June 15,2021 to December 31,2023,we compare these data with the data from the official quick reports of the earthquakes in Beijing City,Tianjin City,and Hebei Province from China Earthquake Networks Center in terms of matching rate of earthquake events,timeliness of early warning,deviation of the first-reported magnitude,and deviation of the first-reported epicentral location.We find that as for the first-reported data from JEEW system,time usage lies in 3.8-7.0 seconds,magnitude deviation lies in 0.1-0.7,and epicentral location deviation ranges between 0.6-2.6 km.As for the first-reported data from EEW system,time usage lies in 3.4-7.0 s,magnitude deviation lies in 0.0-0.8,and epicentral location deviation ranges between 0.6-2.6 km.Thus,we conclude that for the 3.0-magnitude earthquakes or above,the Tianjin Earthquake Early Warning System will produce related seismic parameters more efficiently and more accurately.

引言
1 天津地震预警观测台网概况
2 数据资料选取
3 预警系统产出结果分析
4 结论

图1 天津地震预警观测台网台站及京津冀地区正式速报地震分布<br/>Fig.1 Distribution of the Tianjin Earthquake Early Warning Network and official quick report of the earthquakes in Beijing,Tianjin and Hebei

图1 天津地震预警观测台网台站及京津冀地区正式速报地震分布
Fig.1 Distribution of the Tianjin Earthquake Early Warning Network and official quick report of the earthquakes in Beijing,Tianjin and Hebei

图2 天津地震预警网的理论预警首报用时(a)、理论预警最小震级(b)及局部台间距(c)分布<br/>Fig.2 Distribution of the theoretical time of first warning(a),distribution of theoretical minimum magnitudes(b)and distribution of regional distance of sub-stations(c)of the Tianjin Earthquake Early Warning Network

图2 天津地震预警网的理论预警首报用时(a)、理论预警最小震级(b)及局部台间距(c)分布
Fig.2 Distribution of the theoretical time of first warning(a),distribution of theoretical minimum magnitudes(b)and distribution of regional distance of sub-stations(c)of the Tianjin Earthquake Early Warning Network

表1 JEEW系统和EEW系统对不同震级范围地震的首报信息<br/>Tab.1 Information of the first report of earthquakes in different ranges produced by JEEW system and EEW system

表1 JEEW系统和EEW系统对不同震级范围地震的首报信息
Tab.1 Information of the first report of earthquakes in different ranges produced by JEEW system and EEW system

图3 JEEW系统(a)和EEW系统(b)首报用时、震中偏差、震级及震级偏差分布<br/>Fig.3 JEEW system's(a)and EEW system's(b)first report time,epicenter errors,magnitudes and magnitude errors[JZ)]

图3 JEEW系统(a)和EEW系统(b)首报用时、震中偏差、震级及震级偏差分布
Fig.3 JEEW system's(a)and EEW system's(b)first report time,epicenter errors,magnitudes and magnitude errors[JZ)]

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备注

引言

1 天津地震预警观测台网概况

2 数据资料选取

3 预警系统产出结果分析

4 结论

期刊信息