We assess the detection of the August 4, 2020 chemical explosion in Beirut, Lebanon (33°N, 35°E). We use ionospheric total electron content (TEC) observations from a regional network of ground-based Global Positioning System (GPS) receivers to study the ionospheric variability and wave perturbations generated by the Beirut explosion. Our analysis reveals that the induced wave structures arrived in the ionosphere 10 ± 2 min after the explosion, which is a strong indication of acoustic gravity wave activity. These wave structures are characterized with ΔTEC of 0.06 TECU moving at ∼750 m/s in south-east direction away from the explosion epicenter. The continuous wavelet analysis we applied shows a dominant wave periodicity of 1.5–2.5 min (6.78–11 mHz) in the ionosphere. Furthermore, we use measurements from ERA-interim analysis to establish the ambient neutral atmospheric conditions before the Beirut explosion event. Finally, the observed ionospheric wave perturbations appear to be in good agreement with the expected arrival of acoustic gravity waves generated following the explosion.

中文翻译：

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调查 2020 年贝鲁特爆炸事件后的电离层扰动

我们评估了 2020 年 8 月 4 日在黎巴嫩贝鲁特（北纬 33 度，东经 35 度）发生的化学爆炸事件。我们使用来自地面全球定位系统 (GPS) 接收器区域网络的电离层总电子含量 (TEC) 观测数据来研究贝鲁特爆炸产生的电离层变异性和波扰动。我们的分析表明，诱导波结构在爆炸后 10±2 分钟到达电离层，这是声重力波活动的强烈迹象。这些波浪结构的特点是 ΔTEC 为 0.06 TECU，以 750 m/s 的速度向东南方向远离爆炸震中移动。我们应用的连续小波分析显示主波周期为 1.5-2.5 分钟（6.78-11 mHz) 在电离层。此外，我们使用 ERA 临时分析的测量结果来确定贝鲁特爆炸事件之前的环境中性大气条件。最后，观测到的电离层波扰动似乎与爆炸后产生的声学重力波的预期到达非常一致。