【摘要】 水下爆炸事件的监测作为一项重要的任务备受地球物理学家的关注。2022年9月26日，北溪在波罗的海地区发生两次水下爆炸。媒体和欧洲地中海地震中心（EMSC）的报告得出结论，一次探测到的事件发生在格林尼治标准时间17:03:49，震级为里氏3.1级，另一次缺乏更多信息。为了进一步调查北溪事故的细节，我们利用周围的14个站点进行以下分析。通过应用线性反演方法，我们估计这两起事故发生在00:03:30和17:03:49，对应位置分别位于54.87°N,15.52°E和55.59°N,15.80°E，里氏震级分别为2.3和3.1。频谱分析证实这两个事件是水下爆炸，频域中的一些异常信号可以为估计源参数和特征提供有用的线索，特别是对于第一个事件。更多还原

【Abstract】 As a significant detection task, underwater explosion events have piqued the interest of geophysicists. On September 26, 2022, two underwater explosions occurred in the Baltic Sea region involving the Nord Stream pipeline. Subsequent reports from the media and the European–Mediterranean Seismological Centre deduced that one event was detected at 17:03:49 GMT, exhibiting a magnitude of 3.1 on the Richter scale, whereas the second event lacked comprehensive information. To meticulously investigate the details of the two Nord Stream incidents, we employed 14 proximate stations for subsequent analysis. Using a linear inversion technique, we determined that the two events occurred at 00:03:30 and 17:03:49,with corresponding coordinates of 54.87°N, 15.52°E and 55.59°N, 15.80°E, respectively, and Richter magnitudes of 2.3 and 3.1, respectively. Spectral analysis corroborates that both events were underwater explosions, and the presence of anomalous signals within the frequency domain may provide valuable insights into source parameters and characteristics, particularly for the first event.更多还原