M3.3 Earthquake 77 km ESE of Chignik, Alaska — August 27, 2021
2021-08-27 23:50:19 UTC (2021-08-27) · approx. 1:50 PM UTC-10 local
On August 27, 2021 at 23:50 UTC, a magnitude 3.3 shallow crustal earthquake struck 77 km ESE of Chignik, Alaska, at a depth of 9.7 km and coordinates 56.0453°, -157.2406°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-157.2406°E
Technical Information
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Common Questions
How strong was the magnitude 3.3 earthquake near Chignik, Alaska?
The magnitude 3.3 earthquake that struck 77 km ESE of Chignik, Alaska on August 27, 2021 at 23:50 UTC had a depth of 9.7 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021aznfo4x). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 27, 2021). M3.3 Earthquake 77 km ESE of Chignik, Alaska — August 27, 2021. Retrieved November 6, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021aznfo4x/