'Wave of silence' spread around world during coronavirus pandemic

Seismologists said high frequency noise fell as much as 50% as planes were grounded and roads emptied

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An unprecedented wave of silence spread around the world in the wake of the coronavirus pandemic, according to researchers who found that vibrations from human activity slumped under national lockdowns.

Records from seismic stations all over the planet show that high frequency noise caused by industrial plants, traffic and other activities fell as much as 50% as country after country imposed restrictions that grounded planes, emptied roads and brought down the shutters on shops and businesses.