Magnitude 4.8 earthquake strikes 281 km SSE of Ushuaia, Argentina

A magnitude 4.8 earthquake struck 281 kilometers south-southeast of Ushuaia, Argentina, on Tuesday, July 21, 2026, at 17:21:06 GMT. The seismic event occurred at a shallow depth of 10 kilometers, according to the U.S. Geological Survey (USGS). The epicenter was located at coordinates -57.1718 latitude and -66.6861 longitude.

The USGS, a scientific agency of the United States government, is a primary source for earthquake information globally. They monitor seismic activity worldwide using a network of seismographs and various data analysis techniques to determine key earthquake parameters such as magnitude, location, and depth. Magnitude is a measure of the energy released at the earthquake's source.