M3.0 Earthquake 190 km SE of Chignik, Alaska — September 8, 2021
2021-09-08 19:35:27 UTC (2021-09-08) · approx. 9:35 AM UTC-10 local
On September 8, 2021 at 19:35 UTC, a magnitude 3.0 shallow crustal earthquake struck 190 km SE of Chignik, Alaska, at a depth of 32.4 km and coordinates 55.3098°, -155.9122°.
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
-155.9122°E
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Common Questions
How strong was the magnitude 3.0 earthquake near Chignik, Alaska?
The magnitude 3.0 earthquake that struck 190 km SE of Chignik, Alaska on September 8, 2021 at 19:35 UTC had a depth of 32.4 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: ak021bjfewrz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 8, 2021). M3.0 Earthquake 190 km SE of Chignik, Alaska — September 8, 2021. Retrieved November 17, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021bjfewrz/