Spectra of acoustic and ground motion data for 2 time windows from 2022/04/21 with clear (top, 0:00–6:00 UTC) and no (bottom, 19:00–24:00 UTC) AM. While the peaks at 20 Hz and 29 Hz exhibit side peaks at distances of 1/3 of the BPF, the peak at 57.8 Hz shows side peaks at the BPF. A further main peak is observed at 61 Hz in the ground motion data, which is smaller relative to the amplitude of the surrounding frequencies in the acoustic data.