For the first time, researchers were able to detect the vibrations created by human transportation systems.
"Planes, trains and automobiles create the noisy background to our lives--especially in urban areas. In addition to getting us from point A to point wherever-we're-headed, the swift movement of transportation creates plenty of noise and vibrations. But the low-frequency noise of these vibrations is usually completely unnoticed by humans, until now," writes Mary Beth Griggs.
That's because researchers from Scripps Institution of Oceanography used a network of 5,300 geophones in Long Beach, California, once used for oil and gas surveys, to pick up on the vibrations caused by human transportation."
According to a press release announcing the discovery, the researchers were able to "follow a metro schedule, count aircraft and their acceleration on a runway, and even see larger vehicles on a 10-lane highway."
FULL STORY: Scientists Listen In To The Seismic Soundscapes Of Human Activity

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