M4.0 Earthquake 259 km NE of Qamdo, China — July 4, 2021
2021-07-04 21:48:30 UTC (2021-07-04) · approx. 4:48 AM UTC+7 local
On July 4, 2021 at 21:48 UTC, a magnitude 4.0 shallow crustal earthquake struck 259 km NE of Qamdo, China, at a depth of 15.0 km and coordinates 32.9708°, 98.8816°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
98.8816°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Qamdo, China?
The magnitude 4.0 earthquake that struck 259 km NE of Qamdo, China on July 4, 2021 at 21:48 UTC had a depth of 15.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000eiqs). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 4, 2021). M4.0 Earthquake 259 km NE of Qamdo, China — July 4, 2021. Retrieved September 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000eiqs/