M3.2 Earthquake 191 km SE of Chignik, Alaska — September 16, 2021
2021-09-16 18:35:03 UTC (2021-09-16) · approx. 8:35 AM UTC-10 local
On September 16, 2021 at 18:35 UTC, a magnitude 3.2 shallow crustal earthquake struck 191 km SE of Chignik, Alaska, at a depth of 34.0 km and coordinates 55.0157°, -156.3657°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 951 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 97 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-156.3657°E
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Common Questions
How strong was the magnitude 3.2 earthquake near Chignik, Alaska?
The magnitude 3.2 earthquake that struck 191 km SE of Chignik, Alaska on September 16, 2021 at 18:35 UTC had a depth of 34.0 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 3.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021bwn46z7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 16, 2021). M3.2 Earthquake 191 km SE of Chignik, Alaska — September 16, 2021. Retrieved November 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021bwn46z7/