Seismic Sounds
by John Bullitt

To make the original seismic signals audible, the recordings have been speeded up several hundred-fold: the sounds the listener hears unfolding in about 5 minutes correspond to the vibrations recorded over an entire day of real Earth time. Over the course of a few minutes, you hear dozens of earthquakes, large and small, from around the globe, as well as the ebb and flow of storm-generated ocean surf noise, all against a steady backdrop of the Earth's own characteristic background noise. Delicate ticks and pops, distant booms, diffuse whoops, crackles, and whistles appear, only to slip away again into the background.