M4.7 Earthquake 36 km S of Xunchang, China — July 29, 2020
2020-07-29 20:09:32 UTC (2020-07-29) · approx. 3:09 AM UTC+7 local
Aftershock of the M5.0 mainshock.
On July 29, 2020 at 20:09 UTC, a magnitude 4.7 shallow crustal earthquake struck 36 km S of Xunchang, China, at a depth of 10.0 km and coordinates 28.1296°, 104.6972°.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 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 5.0 mainshock that occurred 14 days ago 13 km N of Xunchang, China. Since the mainshock, the USGS has recorded 2 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
104.6972°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Xunchang, China?
The magnitude 4.7 earthquake that struck 36 km S of Xunchang, China on July 29, 2020 at 20:09 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 28.1296°, 104.6972°, which is 36 km S of Xunchang, China.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.7 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 13 km N of Xunchang, China. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Authoritative source: USGS event page (event ID: us6000b98k). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 29, 2020). M4.7 Earthquake 36 km S of Xunchang, China — July 29, 2020. Retrieved October 10, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000b98k/