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[1]ZHU Jie,ZHONG Yusheng.Evaluation of the Monitoring Capability of the Yunnan Earthquake Early Warning Network[J].Journal of Seismological Research,2025,(03):422-431.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0044 ]

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Evaluation of the Monitoring Capability of the Yunnan Earthquake Early Warning Network

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 03 Page number: 422-431 Column: Public date: 2025-04-15

Title:: Evaluation of the Monitoring Capability of the Yunnan Earthquake Early Warning Network

Author(s):: ZHU Jie; ZHONG Yusheng; (Yunnan Earthquake Agency,Kunming 650024,Yunnan,China)

Keywords:: noise level; earthquake early warning; monitoring capability; timeliness; confusion matrix

CLC:: P315.39

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0044

Abstract:: To study the warning effectiveness of the Yunnan Earthquake Early Warning Network,this paper selects the complete records of noise data of one day in each month of 2023,which has no earthquakes and less interference.The distribution of the peak ground displacement(PGD)of the three types of sensors is calculated,and the month(February)with the highest noise of the three types of sensors is chosen to conduct a comprehensive assessment of the warning network.By using the traditional monitoring capacity assessment method of seismic networks that considers timeliness and the confusion matrix method,this paper studies the minimum warning magnitude,the first report time after an earthquake,and the trigger threshold of the warning system for the three types of sensors when they are independently networked and in a combined network within the Yunnan Earthquake Early Warning Network.The results revealed that PGD of the seismometers' sensors ranged between 0.004-0.048 μm,PGD of the accelerographs' sensors ranged between 0.04-2.85 μm,and PGD of the intensity-meters' sensors ranged 7.5-26.9 μm.The lower limit of the monitoring capability of the Yunnan Earthquake Early Warning Network is determined by the seismometer network it contains; its average is M_L1.3.The average value of the minimum magnitude for the Yunnan Earthquake Early Warning Network is M_L2.7,and in 55% of Yunnan area the early warning network can detect the magnitudes smaller than M_L3.0.In 95% of Yunnan area the early warning network can detect the magnitudes smaller than M_L3.4.The average time of the first-report for early warning after the earthquake is 5.2 s.For 55% of Yunnan area,the first-report time is less than 5.1 s.For 95% of Yunnan area,the reporting first-report time is less than 5.8 s.Increasing the station of the Yunnan Earthquake Early Warning System can help reduce the lower limit of the magnitude for early warning,and reduce the post-earthquake first report time.The triggering threshold of the Yunnan Earthquake Early Warning System is M_L3.0,which can meet the monitoring requirement.In this case,the whole warning system's exactitude is 0.7797,its precision is 0.8955,its sensitivity is 0.7595,its specificity is 0.8205,and its F1 score is 0.8219.

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Last Update: 2025-04-15