NAGQU, Tibet — A shallow magnitude 5.9 earthquake was recorded at 11:25 UTC on Sunday (October 25) about 218 km east-northeast of Nagqu, China, at a depth of 7.0 km, according to the US Geological Survey (USGS).

Source: USGS via The Watchers, Oct 25

China's Earthquake Networks Center (CENC) measured the same Sunday-evening tremor at magnitude 5.7 in Baqen County of Nagqu City, in the Xizang Autonomous Region, Xinhua reported. The two agencies often differ slightly on magnitude and depth because they use separate measurement methods and seismic models.

The tremor is a strong aftershock of Thursday night's (October 22) magnitude 7.0 earthquake in Baqen County, which killed 16 people and injured 76, according to the latest Nagqu municipal assessment cited by Xinhua. Homes belonging to 339 households collapsed or were damaged in the main quake, and 12,489 residents had been relocated to safety, with relief teams setting up tents and building prefabricated houses in villages such as Maru Township.

The USGS issued a green alert for Sunday's aftershock, indicating a low likelihood of casualties or damage from this event on its own, and put its maximum estimated intensity at VII. No new casualties from the aftershock were immediately reported.

The Tibetan Plateau sits on the boundary where the Indian and Eurasian tectonic plates collide, making it one of the world's most seismically active regions. Hundreds of aftershocks were recorded after Thursday's main quake, and officials have warned residents in damaged, high-altitude villages to stay in temporary shelters while buildings are checked.