We present a new class of seismic signals that are recorded by the seismometer placed on the surface of Mars as part of the NASA InSight mission. The signals, termed super high frequency (SF) events, are of short duration (∼20 s), are often similar in amplitude, and feature high‐frequency energy between ∼5 and 30 Hz that is dominant on the horizontal components. For detection and characterization of SF events, we employ the available continuous 20 samples per second (sps) data from the Very Broadband instrument. Due to bandwidth limitations, 100 sps data from the short‐period sensor are only partially obtainable, but they aid in analysis of the frequency content above 10 Hz and in distinguishing the events from high‐frequency noise. From June 2019 to May 2020, 780 SF events have been detected. The events observed occur in repeatable patterns that last for weeks. Initially, the SF events were clustered in the hours before sunset, but more recently, they have been distributed across the evening period. Based on template matching techniques, we have identified 16 distinct families that generally follow the temporal clusters. A thermal origin of these events is suggested, since the majority of the events fall within a ±2 h time window around sunset with extreme temperature changes. The SF events have similarities with thermal events observed on the lunar surface from data collected during the Apollo missions.

中文翻译：

---

超高频事件：火星上的InSight地震仪记录的新型事件

作为NASA InSight任务的一部分，我们提出了一类新的地震信号，该地震信号由放置在火星表面的地震仪记录。这些信号称为超高频（SF）事件，持续时间短（约20 s），幅度通常相似，并且具有约5至30 Hz的高频能量，在水平分量上占主导地位。为了检测和表征SF事件，我们使用了来自甚宽带仪器的每秒20个连续采样（sps）数据。由于带宽限制，只能部分获得短周期传感器的100 sps数据，但它们有助于分析10 Hz以上的频率，并有助于区分事件与高频噪声。从2019年6月到2020年5月，已检测到780个SF事件。观察到的事件以可重复的模式发生，持续数周。最初，SF事件聚集在日落之前的几个小时，但最近，它们已分布在整个晚上。基于模板匹配技术，我们确定了16个不同的家族，这些家族通常遵循时间簇。建议使用这些事件的热源，因为大多数事件都在温度剧烈变化的日落附近的±2 h时间范围内。SF事件与从阿波罗任务期间收集的数据在月球表面观测到的热事件相似。我们确定了16个不同的家族，这些家族通常遵循时间簇。建议使用这些事件的热源，因为大多数事件都在温度剧烈变化的日落附近的±2 h时间范围内。SF事件与从阿波罗任务期间收集的数据在月球表面观测到的热事件相似。我们确定了16个不同的家族，这些家族通常遵循时间簇。建议使用这些事件的热源，因为大多数事件都在温度剧烈变化的日落附近的±2 h时间范围内。SF事件与从阿波罗任务期间收集的数据在月球表面观测到的热事件相似。