M3.4 Earthquake 46 km SSW of Ivanof Bay, Alaska — April 20, 2021
2021-04-20 19:58:04 UTC (2021-04-20) · approx. 8:58 AM UTC-11 local
On April 20, 2021 at 19:58 UTC, a magnitude 3.4 shallow crustal earthquake struck 46 km SSW of Ivanof Bay, Alaska, at a depth of 65.4 km and coordinates 55.5150°, -159.7545°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-159.7545°E
Technical Information
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Common Questions
How strong was the magnitude 3.4 earthquake near Ivanof Bay, Alaska?
The magnitude 3.4 earthquake that struck 46 km SSW of Ivanof Bay, Alaska on April 20, 2021 at 19:58 UTC had a depth of 65.4 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 3.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021528ruq3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 20, 2021). M3.4 Earthquake 46 km SSW of Ivanof Bay, Alaska — April 20, 2021. Retrieved July 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021528ruq3/