M3.0 Earthquake 186 km SSE of Attu Station, Alaska — September 20, 2022
2022-09-20 20:51:30 UTC (2022-09-20) · approx. 8:51 AM UTC+12 local
On September 20, 2022 at 20:51 UTC, a magnitude 3.0 shallow crustal earthquake struck 186 km SSE of Attu Station, Alaska, at a depth of 10.0 km and coordinates 51.2049°, 173.7340°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
173.7340°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Attu Station, Alaska?
The magnitude 3.0 earthquake that struck 186 km SSE of Attu Station, Alaska on September 20, 2022 at 20:51 UTC had a depth of 10.0 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000ivd6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 20, 2022). M3.0 Earthquake 186 km SSE of Attu Station, Alaska — September 20, 2022. Retrieved November 26, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ivd6/