M3.2 Earthquake 239 km ESE of Chiniak, Alaska — September 25, 2020
2020-09-25 16:57:05 UTC (2020-09-25) · approx. 6:57 AM UTC-10 local
On September 25, 2020 at 16:57 UTC, a magnitude 3.2 shallow crustal earthquake struck 239 km ESE of Chiniak, Alaska, at a depth of 22.1 km and coordinates 56.4951°, -148.9110°.
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
-148.9110°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Chiniak, Alaska?
The magnitude 3.2 earthquake that struck 239 km ESE of Chiniak, Alaska on September 25, 2020 at 16:57 UTC had a depth of 22.1 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: us6000c4zq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 25, 2020). M3.2 Earthquake 239 km ESE of Chiniak, Alaska — September 25, 2020. Retrieved December 5, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c4zq/