Seismometers record low frequency ground motion from geological origin (earthquakes, volcanoes, glaciers), biological sources (marine mammal vocalizations) and human-made noise (marine traffic, trains, cars). These low frequency noises are below the human audible range, termed infrasound.
The following audiovisuals were recorded from seismometers (ocean and land based). The waveforms have been sped up ~1000 times to become audible. Samples currently included are from seismometers along the Northeast Pacific Ocean (offshore-nearshore Washington and Cape Mendocino, California) and in Eastern Canada (Lower St. Lawrence Seaway).
Enjoy eavesdropping on the seismic soundscape!