Using a dense sensor network that scanned the areas researchers have identified areas within the country marked by a persistent seismic signal caused by industrial processes.
· Researchers are developing a map of this harmonic tonal noise or "industrial hum." The harmonic tonal noise map that Marcillo and colleagues are developing can pinpoint where certain types of industrial activity are prominent.
They first noted the industrial signals in acoustic data they were collecting from infrasound experiments to study the global propagation of noise from phenomena like ocean storms. They realized that part of the infrasound signal they were detecting was coming from wind farms tens of kilometres away from the detectors.
They realized that the wind farms should send a seismic signal through the ground as well, and began searching for these signals in seismic data collected across the area by the Transportable Array, a mobile network of 400 high-quality broadband seismographs
· The characteristic signals are produced by large industrial machinery like the wind farm turbines, turbines
They realized that the same processes that happen in a big wind farm, you would see in big pumps, anything that has rotating parts, hydro turbines or blowers, anything that moves very harmonically and creates these tonal signatures,
Researcher said the map could help researchers learn more about where these industrial signals might interfere with other seismic data collection efforts. Scientists building massive and hypersensitive instrumentation such as particle colliders might also benefit from knowing about nearby sources of industrial hum.
Many researchers have sought to erase instead of enhance these kinds of industrial signals in their work. Some of the techniques They have to study earthquakes, for instance, try to get rid of all these features because
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