Fig. 1: 2.4 Hz mode observation across the InSight mission.
From: The shallow structure of Mars at the InSight landing site from inversion of ambient vibrations
a Vertical-component energy between 2.3 and 2.5 Hz for sols 80−650. Each row corresponds to the data from one sol plotted against local mean solar time (LMST). Vertical white dashed lines indicate sunrise and sunset. b Power spectral density (PSD) plots averaged over 20 sols extracted for the time windows marked in the spectrogram in (a). Note specifically the stable shape of the peak around 2.4 Hz across the entire mission duration. Evenings are generally quieter and more stable than any other time of day. The peak power level of the 2.4 Hz mode marked by the dashed line weakly depends on the wind speed17. In comparison, the lander-related mode at 3.3 Hz (black arrows) changes its peak frequency and amplitude level considerably depending on wind and temperature.
