M4.5 Earthquake 43 km N of Jiangyou, China — July 16, 2021
2021-07-16 07:59:49 UTC (2021-07-16) · approx. 2:59 PM UTC+7 local
Aftershock of the M5.4 mainshock.
On July 16, 2021 at 07:59 UTC, a magnitude 4.5 shallow crustal earthquake struck 43 km N of Jiangyou, China, at a depth of 10.0 km and coordinates 32.1573°, 104.6416°.
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 5.4 mainshock that occurred 23 days ago 21 km WNW of Jiangyou, China. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
104.6416°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Jiangyou, China?
The magnitude 4.5 earthquake that struck 43 km N of Jiangyou, China on July 16, 2021 at 07:59 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 32.1573°, 104.6416°, which is 43 km N of Jiangyou, 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 M5.4 one earlier?
No. This magnitude 4.5 earthquake is an aftershock of the larger magnitude 5.4 mainshock that occurred earlier 21 km WNW of Jiangyou, China. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Authoritative source: USGS event page (event ID: us6000exzu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 16, 2021). M4.5 Earthquake 43 km N of Jiangyou, China — July 16, 2021. Retrieved September 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000exzu/