The seismometer onboard InSight NASA Mars mission discovered a seismically active planet. We focused on the strongest event named S1222a (4 May 2022, M_w ∼ 4.7), which was recorded by the Very Broad Band sensors and associated channel ELYSE and is located 37.2° away from InSight. We use two different methods based on a point source approach for an elastic, horizontally layered medium to retrieve source parameters of S1222a. In the first case, the seismic moment tensor inversion of high-frequency seismogram data is calculated using a matrix method for the direct waves. The process includes the generation of records in displacement using the frequency-wavenumber integration technique. A method of inversion of the moment tensor of direct P- and S-waves, less sensitive to path effects than reflected and transformed waves, is presented, which significantly increases the accuracy and reliability of the method. In the second case, tensors were calculated using common low-frequency full-waveform inversion and the tests to verify the plausibility of this solution obtained from the single station calculation were performed and the uncertainty estimations for inversions can be useful in future research.

中文翻译：

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Sol 1222火星震的高频和低频波形分析：震源机制、质心矩张量反演和源时间函数

美国宇航局火星任务洞察号上的地震仪发现了一颗地震活跃的行星。我们重点关注名为 S1222a（2022 年 5 月 4 日，M _w  ∼ 4.7）的最强事件，该事件由甚宽带传感器和相关通道 ELYSE 记录，距离 InSight 37.2°。我们使用两种基于弹性水平分层介质点源方法的不同方法来检索 S1222a 的源参数。在第一种情况下，高频地震记录数据的地震矩张量反演是使用直达波的矩阵方法计算的。该过程包括使用频率波数积分技术生成位移记录。提出了一种直接纵横波矩张量反演方法，该方法对路径效应的敏感度低于反射波和变换波，显着提高了该方法的精度和可靠性。在第二种情况下，使用常见的低频全波形反演来计算张量，并通过单站计算来验证该解的合理性，并且反演的不确定性估计可以在未来的研究中有用。