Mapping industrial 'hum' in the US
Using a dense sensor network that scanned the United States between 2003 and 2014, researchers have identified areas within the country marked by a persistent seismic signal caused by industrial processes.
from Latest Science News -- ScienceDaily http://bit.ly/2WaIE5j
from Latest Science News -- ScienceDaily http://bit.ly/2WaIE5j
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