M2.8 Earthquake 19 km NNE of Willow, Alaska — February 23, 2021
2021-02-23 20:36:03 UTC (2021-02-23) · approx. 10:36 AM UTC-10 local
On February 23, 2021 at 20:36 UTC, a magnitude 2.8 shallow crustal earthquake struck 19 km NNE of Willow, Alaska, at a depth of 38.9 km and coordinates 61.9014°, -149.8716°.
Physical scale: An earthquake of magnitude 2.8 releases seismic energy equivalent to roughly 239 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 52 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-149.8716°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.8 earthquake near Willow, Alaska?
The magnitude 2.8 earthquake that struck 19 km NNE of Willow, Alaska on February 23, 2021 at 20:36 UTC had a depth of 38.9 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 2.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 2.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0212hn54q9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, February 23, 2021). M2.8 Earthquake 19 km NNE of Willow, Alaska — February 23, 2021. Retrieved May 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0212hn54q9/