2023年8月6日山东平原发生MS 5.5地震，中国地震台网中心部署的超快速报与预警系统（JEEW）有效处理并产出预警信息。本次地震发生在山东预警区内，震后5.2 s发布首次预警处理结果，使用了5个台站数据，与正式速报结果相比，震中位置偏差3.5 km，震级偏差-0.5，盲区半径16 km。首报预警震级偏小，主要是因为震后短时间内有效波形数据较少；后续预警震级整体偏大，主要与华北平原沉积盆地存在放大效应、不同震级算法和触发站网数量有关。结果表明，JEEW预警系统在本次地震中产出效果较好，但其震级算法尚有待改进。
On August 6, 2023, the MS 5.5 earthquake occurred in Pingyuan County, Shandong Province. The JEEW data processing system of the China Earthquake Networks Center had effectively processed and produced the early warning information. This earthquake occurred within the Shandong earthquake early warning network. The first early warning processing results were released 5.5 s after the earthquake, using data from 5 stations. Compared with the official quick report results, the first early warning processing results show that the deviation of the epicenter position is 3.5 km, the magnitude deviation is -0.5, and the blind zone radius is 16 km. The main reason for the small early warning magnitude is that there were few effective waveform data in the short term after the earthquake. In addition, the overall large early warning magnitude is mainly related to the amplification effect of the sedimentary basin in the North China Plain, different magnitude algorithms, and the number of trigger stations. The results show that the JEEW warning system has good results, but the magnitude algorithm remains to be improved.
2023,44（6）: 20-26 收稿日期：2023-9-21
DOI：10.3969/j.issn.1003-3246.2023.06.003
基金项目：国家自然科学基金（项目编号：42304072）
作者简介：徐佳静（1992—），女，工程师，主要从事地震速报和预警等研究工作。E-mail：xujiajing@seis.ac.cn
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