M4.2 Earthquake 121 km E of Petropavlovsk-Kamchatsky, Russia — September 19, 2025
2025-09-19 20:33:22 UTC (2025-09-19) · approx. 7:33 AM UTC+11 local
On September 19, 2025 at 20:33 UTC, a magnitude 4.2 shallow crustal earthquake struck 121 km E of Petropavlovsk-Kamchatsky, Russia, at a depth of 45.6 km and coordinates 53.0506°, 160.4387°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 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 29 days ago 164 km E of Petropavlovsk-Kamchatsky, Russia. Since the mainshock, the USGS has recorded 15 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
160.4387°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Petropavlovsk-Kamchatsky, Russia?
The magnitude 4.2 earthquake that struck 121 km E of Petropavlovsk-Kamchatsky, Russia on September 19, 2025 at 20:33 UTC had a depth of 45.6 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 4.2 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 4.2 earthquake is an aftershock of the larger magnitude 5.8 mainshock that occurred earlier 164 km E of Petropavlovsk-Kamchatsky, Russia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rgd8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 19, 2025). M4.2 Earthquake 121 km E of Petropavlovsk-Kamchatsky, Russia — September 19, 2025. Retrieved December 6, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000rgd8/