M4.0 Earthquake 166 km SE of Petropavlovsk-Kamchatsky, Russia — October 26, 2025
2025-10-26 16:05:14 UTC (2025-10-26) · approx. 3:05 AM UTC+11 local
On October 26, 2025 at 16:05 UTC, a magnitude 4.0 shallow crustal earthquake struck 166 km SE of Petropavlovsk-Kamchatsky, Russia, at a depth of 37.8 km and coordinates 52.2464°, 160.6859°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.8 mainshock that occurred 26 days ago 156 km ESE of Petropavlovsk-Kamchatsky, Russia. Since the mainshock, the USGS has recorded 8 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
160.6859°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Petropavlovsk-Kamchatsky, Russia?
The magnitude 4.0 earthquake that struck 166 km SE of Petropavlovsk-Kamchatsky, Russia on October 26, 2025 at 16:05 UTC had a depth of 37.8 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.
Is this the same earthquake as the M5.8 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.8 mainshock that occurred earlier 156 km ESE of Petropavlovsk-Kamchatsky, Russia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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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: us6000rncb). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 26, 2025). M4.0 Earthquake 166 km SE of Petropavlovsk-Kamchatsky, Russia — October 26, 2025. Retrieved January 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rncb/