M3.0 Earthquake 204 km WSW of Adak, Alaska — April 16, 2021
2021-04-16 23:11:03 UTC (2021-04-16) · approx. 11:11 AM UTC-12 local
On April 16, 2021 at 23:11 UTC, a magnitude 3.0 shallow crustal earthquake struck 204 km WSW of Adak, Alaska, at a depth of 12.7 km and coordinates 50.9220°, -179.1493°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-179.1493°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Adak, Alaska?
The magnitude 3.0 earthquake that struck 204 km WSW of Adak, Alaska on April 16, 2021 at 23:11 UTC had a depth of 12.7 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000e14z). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 16, 2021). M3.0 Earthquake 204 km WSW of Adak, Alaska — April 16, 2021. Retrieved July 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000e14z/