M4.1 Earthquake 265 km W of Adak, Alaska — February 12, 2021
2021-02-12 19:46:40 UTC (2021-02-12) · approx. 7:46 AM UTC+12 local
On February 12, 2021 at 19:46 UTC, a magnitude 4.1 intermediate depth earthquake struck 265 km W of Adak, Alaska, at a depth of 174.9 km and coordinates 52.1130°, 179.5130°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
179.5130°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Adak, Alaska?
The magnitude 4.1 earthquake that struck 265 km W of Adak, Alaska on February 12, 2021 at 19:46 UTC had a depth of 174.9 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000djbh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 12, 2021). M4.1 Earthquake 265 km W of Adak, Alaska — February 12, 2021. Retrieved April 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000djbh/