M4.1 Earthquake 125 km ESE of Kuril’sk, Russia — April 15, 2021
2021-04-15 20:23:25 UTC (2021-04-15) · approx. 6:23 AM UTC+10 local
On April 15, 2021 at 20:23 UTC, a magnitude 4.1 shallow crustal earthquake struck 125 km ESE of Kuril’sk, Russia, at a depth of 35.0 km and coordinates 44.7539°, 149.3221°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 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 5.5 mainshock that occurred 24 days ago 152 km E of Kuril’sk, Russia. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
149.3221°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Kuril’sk, Russia?
The magnitude 4.1 earthquake that struck 125 km ESE of Kuril’sk, Russia on April 15, 2021 at 20:23 UTC had a depth of 35.0 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 4.1 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 4.1 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 152 km E of Kuril’sk, Russia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000e1xi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 15, 2021). M4.1 Earthquake 125 km ESE of Kuril’sk, Russia — April 15, 2021. Retrieved June 19, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000e1xi/