M4.3 Earthquake 137 km ESE of Ozernovskiy, Russia — October 20, 2025
2025-10-20 23:57:40 UTC (2025-10-20) · approx. 10:57 AM UTC+11 local
On October 20, 2025 at 23:57 UTC, a magnitude 4.3 shallow crustal earthquake struck 137 km ESE of Ozernovskiy, Russia, at a depth of 35.0 km and coordinates 51.2027°, 158.4178°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
158.4178°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Ozernovskiy, Russia?
The magnitude 4.3 earthquake that struck 137 km ESE of Ozernovskiy, Russia on October 20, 2025 at 23:57 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rmmk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 20, 2025). M4.3 Earthquake 137 km ESE of Ozernovskiy, Russia — October 20, 2025. Retrieved January 9, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rmmk/