Figure 2.

Power spectral density measured at near-field station GSW (a) and far-field station TNS (c) and correlated with the wind speed (from low wind speeds (black line) to high wind speeds (red line)) registered at the weather station Kleiner Feldberg. The amplitudes of the distinct peaks at 1.15 Hz and 3.5 Hz (inset in c) increase with wind speed and are observable at both stations. At TNS, the amplitudes are lower than at GSW due to amplitude decay with distance. One-hour seismological records during wind speeds > 9 m s⁻¹ (black waveform) and < 0.5 m s⁻¹ (blue waveform) are measured at the station GSW (b) and TNS (d). The I95 value is calculated for the four records to derive noise amplitudes at TNS and at GSW during strong and low wind conditions. It should be noted that the scale of the y-axis in (b) is an order of magnitude greater than in (d).