Seismic sounds of Cascadia (x200) (3/4)

An 14-day soundscape of the Cascadia subduction zone, 25 Aug–7 Sept 2020.

Seismic vibrations recorded at a seismic station in Lake Cowichan, British Columbia, sped up 200 times to human hearing range: an hour becomes fifteen seconds, a day becomes seven minutes.

You can hear the low hum of the ocean rumbling and reverberating against the nearby shores, the scratchy sound of tectonic tremors as the subducting Gorda plate slowly inches its way down into the mantle under Cascadia, claps of earthquakes, clear when nearby, muffled and low when distant, and high-pitched textures of human activity.

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Sonification method:
A seismometer (seismic station) records ground velocity in time. This data can be turned into sound by speeding it up, as ground motion is usually in infrasonic frequencies. Most seismic data can be freely (although not easily) downloaded from https://service.iris.edu/fdsnws/dataselect/1/.