M4.0 Earthquake 141 km SSE of Unalaska, Alaska — April 11, 2022
2022-04-11 22:03:25 UTC (2022-04-11) · approx. 11:03 AM UTC-11 local
On April 11, 2022 at 22:03 UTC, a magnitude 4.0 shallow crustal earthquake struck 141 km SSE of Unalaska, Alaska, at a depth of 10.0 km and coordinates 52.7716°, -165.4674°.
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
-165.4674°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Unalaska, Alaska?
The magnitude 4.0 earthquake that struck 141 km SSE of Unalaska, Alaska on April 11, 2022 at 22:03 UTC had a depth of 10.0 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: us7000h1d8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, April 11, 2022). M4.0 Earthquake 141 km SSE of Unalaska, Alaska — April 11, 2022. Retrieved June 20, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000h1d8/