20 Apr Seismic Messages
Awestruck, people in the northern Indian state of Punjab stare at the sight of the grand Himalayan mountain range, now, after half a century, again visible for more than 100 miles. Why? The reduction in air pollution caused by the national lockdown to contain the coronavirus. Across the planet, in major cities and minor ones, the grind, screech, and roar of modernity are now barely detectable on seismograms. Why? Little or no traffic. Less large-scale machinery. A 30 percent drop in the cacophonous London morning rush, a 38 percent drop in midday Paris, a 50 percent drop in parts of Los Angeles, a staggering 60 percent drop noted at the Geophysical Institute in Quito, Ecuador–where suddenly they hear rumblings from the active volcano that sits beneath the city. As a result of this human quiescence, Earth’s continual quivering, shifting, and settling is being recorded with astonishing clarity. It sighs. It crackles...