M3.3 Earthquake 137 km SE of Perryville, Alaska — April 18, 2022
2022-04-18 21:00:41 UTC (2022-04-18) · approx. 10:00 AM UTC-11 local
On April 18, 2022 at 21:00 UTC, a magnitude 3.3 shallow crustal earthquake struck 137 km SE of Perryville, Alaska, at a depth of 25.0 km and coordinates 55.0592°, -157.5687°.
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
-157.5687°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Perryville, Alaska?
The magnitude 3.3 earthquake that struck 137 km SE of Perryville, Alaska on April 18, 2022 at 21:00 UTC had a depth of 25.0 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 3.3 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0224yyjo9c). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, April 18, 2022). M3.3 Earthquake 137 km SE of Perryville, Alaska — April 18, 2022. Retrieved June 26, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak0224yyjo9c/