M3.1 Earthquake 197 km SE of Perryville, Alaska — June 21, 2023
2023-06-21 20:45:10 UTC (2023-06-21) · approx. 10:45 AM UTC-10 local
On June 21, 2023 at 20:45 UTC, a magnitude 3.1 shallow crustal earthquake struck 197 km SE of Perryville, Alaska, at a depth of 14.7 km and coordinates 54.7274°, -156.8337°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-156.8337°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Perryville, Alaska?
The magnitude 3.1 earthquake that struck 197 km SE of Perryville, Alaska on June 21, 2023 at 20:45 UTC had a depth of 14.7 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 3.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0237wsm1g9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 21, 2023). M3.1 Earthquake 197 km SE of Perryville, Alaska — June 21, 2023. Retrieved August 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak0237wsm1g9/