M4.5 Earthquake 203 km ENE of Nagqu, China — October 25, 2026
2026-10-25 16:46:48 UTC (22 hours ago) · approx. 10:46 PM UTC+6 local
Aftershock of the M5.9 mainshock.
On October 25, 2026 at 16:46 UTC, a magnitude 4.5 shallow crustal earthquake struck 203 km ENE of Nagqu, China, at a depth of 10.0 km and coordinates 32.5003°, 93.8391°. This earthquake was detected by 68 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — 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 5.9 mainshock that occurred 1 day ago 218 km ENE of Nagqu, China. Since the mainshock, the USGS has recorded 12 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
93.8391°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Nagqu, China?
The magnitude 4.5 earthquake that struck 203 km ENE of Nagqu, China on October 25, 2026 at 16:46 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 32.5003°, 93.8391°, which is 203 km ENE of Nagqu, China.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.9 one earlier?
No. This magnitude 4.5 earthquake is an aftershock of the larger magnitude 5.9 mainshock that occurred earlier 218 km ENE of Nagqu, China. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Authoritative source: USGS event page (event ID: us6000u4ux). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 25, 2026). M4.5 Earthquake 203 km ENE of Nagqu, China — October 25, 2026. Retrieved October 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000u4ux/