M5.2 Earthquake 271 km SSE of Dunhuang, China — September 3, 2026

On September 3, 2026 at 17:04 UTC, a magnitude 5.2 shallow crustal earthquake struck 271 km SSE of Dunhuang, China, at a depth of 10.0 km and coordinates 37.7963°, 95.4671°. This earthquake was detected by 74 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 416, placing it among routine seismic activity.

Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 km — a useful intuition for the size of the slip patch on the fault.

This earthquake is part of an ongoing aftershock sequence following the magnitude 5.5 mainshock that occurred 15 days ago 269 km SSE of Dunhuang, China. Since the mainshock, the USGS has recorded 4 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.