M4.0 Earthquake 87 km SSE of Atka, Alaska — September 19, 2022
2022-09-19 21:43:34 UTC (2022-09-19) · approx. 9:43 AM UTC-12 local
On September 19, 2022 at 21:43 UTC, a magnitude 4.0 shallow crustal earthquake struck 87 km SSE of Atka, Alaska, at a depth of 37.9 km and coordinates 51.5288°, -173.5376°.
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
-173.5376°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Atka, Alaska?
The magnitude 4.0 earthquake that struck 87 km SSE of Atka, Alaska on September 19, 2022 at 21:43 UTC had a depth of 37.9 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: us7000ib5a). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 19, 2022). M4.0 Earthquake 87 km SSE of Atka, Alaska — September 19, 2022. Retrieved November 26, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000ib5a/