Earthquake Swarm: How Granite Comes Alive
In 2019, residents of Palghar district in western India felt the ground slip from under their feet — not once, but thousands of times. Over two years, seismographs recorded about 50,000 tremors. This wasn't a typical earthquake with a main shock and aftershocks, but a swarm: a series of events that quiets down and then flares up again, like a smoldering fire fed with twigs.