The Location Deviation Analysis of Yunnan Earthquake Early Warning and Manual Earthquake Rapid Reporting

Selecting the first earthquake early warning report of M ≥ 3.0 within 50 km of Yunnan Province and adjacent areas produced by the Yunnan Earthquake Early Warning Network Integration System from January 1, 2022 to February 28, 2023, and the corresponding results of Yunnan Earthquake Network's manual earthquake rapid reporting, comparing the results of national unified earthquake cataloging, the location deviation of Yunnan earthquake early warning and manual earthquake rapid reporting results were analyzed. The results show that: （1） there are no false or missed reports in the earthquake early warning and manual earthquake rapid reporting of Yunnan Network, and the triggering rate of earthquake early warning reaches 100%; （2） the average time for the first report of earthquake early warning in Yunnan Province is 8 seconds, and the first report time of earthquakes with the cataloging magnitude of M ≥ 4 in Yunnan Province is within 3~11 s; （3） for earthquake events with uniform distribution of stations, there is not much difference between earthquake early warning and manual rapid reporting in terms of the accuracy of earthquake epicenter location; （4） when the cataloging magnitude is 3.0 ≤ M ≤ 5.0, the earthquake early warning magnitude matches well with the manual earthquake rapid reporting, and its magnitude parameters have reliable reference value. Finally, it provides suggestions and opinions on the application of earthquake early warning systems in the Yunnan Early Warning Network, and provides suggestions and measures for further improving the locating accuracy of early warning.