Baptie, Brian. 2010 Extracting information from noise. Earthwise, 26. 64-65.
Abstract
Seismic waves created by sources such as wind, the ocean and human activity propagate inside
the Earth all the time. Such waves are often regarded as ‘noise’ by seismologists, however, they
travel through the Earth in exactly the same way as those waves from earthquakes. Recent
advances in theory have shown that ambient noise recorded at two seismic stations can be
combined to provide information about the properties of the Earth between the two stations. This
is known as seismic interferometry and has revolutionised seismology over the past few years.
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