2024年9月18日安徽肥东4.7级地震应急生成及震源参数初步分析

Jiajing Xu, Guangjie Han, Nan Xi, Li Sun
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引用次数: 0

摘要

北京时间2024年9月18日20时08分,安徽肥东(北纬31.98°,东经117.6°)发生4.7级地震。地震发生后8.9 s,中国地震预警网首次发布预警结果。中国地震台网中心(CENC)在地震发生后163秒发布了自动快速报告结果,在地震发生后8分钟发布了官方快速报告结果。同时,中央地震中心通报了震源参数、地震构造、历史地震、震源机制、仪器地震烈度和预测烈度等一系列应急产品。结果表明,此次地震位于郯庐断裂带南段与飞中断裂带交界处,余震向北东东方向分布。震源机制解表明这次地震本质上是一次走滑事件。震中附近预测烈度可达6级,涉及23个城镇,面积约1359平方公里。只有靠近震中的一个站点的峰值加速度值大于该地区的设防标准,这可能对附近的一些房屋造成轻微损坏,与建筑物的实际损坏一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preliminary analysis of emergency production and source parameters of the M 4.7 earthquake on September 18, 2024 in Feidong, Anhui
At 20:08 on September 18, 2024, Beijing time, an earthquake of magnitude 4.7 occurred in Feidong, Anhui Province (31.98°N, 117.6°E). The China Earthquake Early Warning Network presented the first early warning results 8.9 ​s after the earthquake. The China Earthquake Networks Center (CENC) released the automatic rapid report results 163 ​s after the earthquake and the official rapid report results 8 ​min after the earthquake. At the same time, the CENC reported a series of emergency products, including source parameters, seismic tectonics, historical earthquakes, focal mechanism, instrument seismic intensity and predicted intensity. The results showed that the earthquake was located at the junction of the southern section of the Tanlu Fault and the Feizhong Fault, with aftershocks distributed in the NEE direction. The focal mechanism solution indicates that the earthquake is essentially a strike-slip event. The predicted intensity in the vicinity of the epicenter reaches up to VI, involving 23 towns that cover an area of about 1 359 ​km2. Only one station near the epicenter shows a peak acceleration value greater than the fortification standard of the area, which may cause slight damage to some adjacent houses, consistent with the actual damage to buildings.
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