Based on the data of Jilin Province earthquake early warning network,the minimum magnitude of earthquake early warning network is evaluated systematically and the first warning time of Jilin province is analyzed by using the minimum magnitude assessment method. The results show that:① The background noise levels of the seismometers,strong seismometers,and intensity meters in Jilin early warning station network increase successively. ② The minimum earthquake magnitude which is predicted by the integration of the three networks of strong seismometer,intensity meter and seismometer is higher than that of the single seismometer network. After the integration,the minimum earthquake magnitude is ML 4.4 and can be predicted in 95％ area of Jilin province,and the early warning monitoring ability is obviously better than that of the single network of intensity meter.③ The average time for the first report after the first station's alarm is 5.4 s,and the average time for the first report after the earthquake is 10 s. This study provides a reference for optimization the layout of the early warning station network and improvement of the early warning capability in Jilin Province.
关键词
地震预警台网/噪声水平/地震预警/监测能力/时效性
Key words
early warning station network/noise level/earthquake early warning/monitoring capability/timeliness
维普
万方数据