M3.0 Earthquake 142 km ESE of Nikolski, Alaska — April 16, 2021
2021-04-16 18:33:40 UTC (2021-04-16) · approx. 7:33 AM UTC-11 local
On April 16, 2021 at 18:33 UTC, a magnitude 3.0 shallow crustal earthquake struck 142 km ESE of Nikolski, Alaska, at a depth of 6.4 km and coordinates 52.5967°, -166.8313°.
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
-166.8313°E
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Common Questions
How strong was the magnitude 3.0 earthquake near Nikolski, Alaska?
The magnitude 3.0 earthquake that struck 142 km ESE of Nikolski, Alaska on April 16, 2021 at 18:33 UTC had a depth of 6.4 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: us7000e14x). 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 142 km ESE of Nikolski, Alaska — April 16, 2021. Retrieved July 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000e14x/