M4.0 Earthquake 210 km W of Severo-Kuril’sk, Russia — August 20, 2021
2021-08-20 23:41:31 UTC (2021-08-20) · approx. 9:41 AM UTC+10 local
On August 20, 2021 at 23:41 UTC, a magnitude 4.0 deep-focus earthquake struck 210 km W of Severo-Kuril’sk, Russia, at a depth of 325.5 km and coordinates 50.5211°, 153.1596°.
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
153.1596°E
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Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Severo-Kuril’sk, Russia?
The magnitude 4.0 earthquake that struck 210 km W of Severo-Kuril’sk, Russia on August 20, 2021 at 23:41 UTC had a depth of 325.5 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: us7000f6bf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 20, 2021). M4.0 Earthquake 210 km W of Severo-Kuril’sk, Russia — August 20, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f6bf/