M4.2 Earthquake 171 km SSE of Ust’-Kamchatsk Staryy, Russia — September 28, 2021
2021-09-28 18:28:09 UTC (2021-09-28) · approx. 5:28 AM UTC+11 local
On September 28, 2021 at 18:28 UTC, a magnitude 4.2 shallow crustal earthquake struck 171 km SSE of Ust’-Kamchatsk Staryy, Russia, at a depth of 10.0 km and coordinates 54.7677°, 163.3348°.
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.
Earthquake Details
163.3348°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Ust’-Kamchatsk Staryy, Russia?
The magnitude 4.2 earthquake that struck 171 km SSE of Ust’-Kamchatsk Staryy, Russia on September 28, 2021 at 18:28 UTC had a depth of 10.0 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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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: us6000fqtk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 28, 2021). M4.2 Earthquake 171 km SSE of Ust’-Kamchatsk Staryy, Russia — September 28, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fqtk/