When plate tectonics shift
against each other in the earth, they send out vibrations. These
vibrations occur in two forms, surface waves and body waves. Surface
waves travel along the outside of the earth and may travel the length
of the globe several times before completely dispersing. Body waves
travel through the interior of the earth in two forms; Primary waves
which compress and expand core materials in the direction the wave is
traveling and Secondary waves which shake the material at right
angels to their direction of travel. This is what we feel when we
experience the shaking of an earthquake. Geologists record these
waves using seismographic instruments. This data can be rendered in
the form of a seismogram or audio recording. Since the movement of
the earth emits sounds that are far below the human aural register
the recordings must be played at high speed. This The sounds you are
hearing are seismic impressions recorded by seven globally networked
seismographs, mixed and mastered by J.T Bullitt; geologist and
artist. This project was created by Hallie Chilton as a
collaboration between both the Art Department and the Geology
Department of Portland State University.
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