M3.5 Earthquake 63 km WNW of Nanwalek, Alaska — February 16, 2021
2021-02-16 22:18:50 UTC (2021-02-16) · approx. 12:18 PM UTC-10 local
On February 16, 2021 at 22:18 UTC, a magnitude 3.5 intermediate depth earthquake struck 63 km WNW of Nanwalek, Alaska, at a depth of 94.9 km and coordinates 59.5488°, -152.9666°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-152.9666°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Nanwalek, Alaska?
The magnitude 3.5 earthquake that struck 63 km WNW of Nanwalek, Alaska on February 16, 2021 at 22:18 UTC had a depth of 94.9 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021263gt7u). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 16, 2021). M3.5 Earthquake 63 km WNW of Nanwalek, Alaska — February 16, 2021. Retrieved April 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021263gt7u/