Magnitude 4.9 earthquake strikes 78 km NE of Simao, China

A magnitude 4.9 earthquake struck 78 km NE of Simao, China, on Tuesday, July 21, 2026, at 11:43:08 GMT. The seismic event occurred at a shallow depth of 10 km, originating from coordinates 23.2707, 101.5395.

The earthquake's hypocenter was situated beneath the earth's surface at the specified depth, indicating the point where the rupture began. The magnitude, measured by the U.S. Geological Survey (USGS), quantifies the energy released by the earthquake. The USGS uses a global network of seismograph stations to detect and locate earthquakes and determine their size.