The ground vibrations registered just before the emergence of the herd from the surrounding trees and brush.

He measures the ground vibrations to see how many gooks are on the trail.

Typical frequency range for environmental ground vibrations is 1 - 200 Hz.

Three I have detected ground vibrations at a range of 6200 meters.

He heard the deep thumping of the dragon's feet, felt the ground vibrations through his flesh.

There was no evidence of ground vibration, seismic or otherwise.

The ground vibrations from the Imperial Valley quake were being felt this far north.

It is more likely that what you observe is triggered by sound rather than ground vibrations.

Around 1 Hz, wind and other atmospheric phenomena are also a major source of ground vibrations.

This may particularly be useful for low signal-to-noise ratio signals (small building/high level of ground vibrations).