M4.9 Earthquake 18 km SE of Bijie, China — August 21, 2021
2021-08-21 02:20:11 UTC (2021-08-21) · approx. 9:20 AM UTC+7 local
Felt by 2 people across nearby locations.
On August 21, 2021 at 02:20 UTC, a magnitude 4.9 shallow crustal earthquake struck 18 km SE of Bijie, China, at a depth of 10.0 km and coordinates 27.1864°, 105.4197°.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
105.4197°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Bijie, China?
The magnitude 4.9 earthquake that struck 18 km SE of Bijie, China on August 21, 2021 at 02:20 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 27.1864°, 105.4197°, which is 18 km SE of Bijie, China.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Authoritative source: USGS event page (event ID: us6000f97j). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 21, 2021). M4.9 Earthquake 18 km SE of Bijie, China — August 21, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000f97j/