Quassum (project under construction
Sounds used in this project: 1. Earth’s vibrations In this project, seismic vibrations of the Earth, which are recorded by seismometers, are applied in such a way that you can hear, feel and see it. It is such an experience that you become aware of our great living planet in the cosmos. Some background: the earth always moves and always vibrates. The earth’s vibrations and earthquakes are registered and directly converted into electrical signals. These electrical signals are then transformed by an analog-to-digital converters (sampled). This is a common procedure in digital sound recording and engineering. The sampling frequency of regular audio is normally 44 or 48 kHz and the audio spectrum is between 20 Hz and 20 kHz, unlike frequencies caused by the earth, these sample rates (cycles per second, cps), are somewhere between 3 millihertz and 20 Hz and therefore not audible. Seismic Recording: Stations around the world record 24/7 seismic activity. Some of the data from these recordings has been used for this project, it has been transformed into a tangible and audible
spectrum between 20 and 150 Hz.

Kinemetrics seismograph used by United States Department of the Interior.
(Source: https://commons.wikimedia.org/wiki/File:Kinemetrics_seismograph.jpg)

2. Earth’s Radio signals
Our planet is a radio signal source, mainly at low frequencies: every one of us has, at one time, listened to crackly radio noises on the medium wave during a storm! Different natural phenomena such as Auroras, earthquakes and storms create radio signals. The particular sound of these signals makes them unique and very fascinating.

Source: https://science.nasa.gov/science-news/science- at-nasa/2001/ast19jan_1

3. Earth’s Random sounds
A variety of different sounds that can be heard in the natural and technical environment.

4. Synthetic sounds