On April 29 and 30, 2026, a swarm of at least 17 earthquakes rattled a remote stretch of southern Nevada inside the Nevada Test and Training Range, with some epicenters just miles from the perimeter of the secret base at Groom Lake known as Area 51. Most were between magnitude 2.5 and 4.4. The largest, a 4.4, was only about 4 kilometers deep, much shallower than the usual 9 to 19 kilometers for quakes in the area.

More than 100 people reported feeling the shaking, some as far away as Las Vegas. There was no damage. The U.S. Geological Survey recorded the swarm and said it would keep monitoring for aftershocks. It issued no special advisory.

Seismologists noted that Nevada sits in an extensional zone, where the crust is slowly being pulled apart, and swarms like this are common. The pattern, they said, fits natural stress release along local faults.

The location and the shallowness were enough for social media. Posts asked whether this was covert underground testing, nuclear or otherwise. Speaking on Newsmax, Harvard astronomer Avi Loeb said it could be geological, or, if human-made, explosives testing. The U.S. last conducted a nuclear test in Nevada in 1992, and any nuclear blast would carry distinctive seismic signatures that international monitoring networks are designed to catch. No such detection has been reported.

The military did not comment.