On the minimum of vertical seismic noise near 3 mHz

SUMMARY Acceleration power spectral densities of vertical seismic noise at the best seismic stations show a minimum near 3 mHz. We suggest that this minimum is caused by a cancellation near this frequency of Newtonian attraction vs. free air and inertial effects exerted by atmospheric phenomena on the sensor mass. Simplistic models of atmospheric phenomena are used to quantify this effect and examples are shown for special atmospheric events.