M4.0 Earthquake 189 km SE of Perryville, Alaska — August 7, 2022
2022-08-07 19:15:27 UTC (2022-08-07) · approx. 9:15 AM UTC-10 local
On August 7, 2022 at 19:15 UTC, a magnitude 4.0 shallow crustal earthquake struck 189 km SE of Perryville, Alaska, at a depth of 32.9 km and coordinates 54.7198°, -157.0144°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-157.0144°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Perryville, Alaska?
The magnitude 4.0 earthquake that struck 189 km SE of Perryville, Alaska on August 7, 2022 at 19:15 UTC had a depth of 32.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: ak022a2i3i78). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, August 7, 2022). M4.0 Earthquake 189 km SE of Perryville, Alaska — August 7, 2022. Retrieved October 21, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak022a2i3i78/