M4.0 Earthquake 45 km SSE of Adak, Alaska — November 26, 2020
2020-11-26 22:00:23 UTC (2020-11-26) · approx. 10:00 AM UTC-12 local
On November 26, 2020 at 22:00 UTC, a magnitude 4.0 shallow crustal earthquake struck 45 km SSE of Adak, Alaska, at a depth of 43.0 km and coordinates 51.4840°, -176.4436°.
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
-176.4436°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Adak, Alaska?
The magnitude 4.0 earthquake that struck 45 km SSE of Adak, Alaska on November 26, 2020 at 22:00 UTC had a depth of 43.0 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: us7000ck5w). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, November 26, 2020). M4.0 Earthquake 45 km SSE of Adak, Alaska — November 26, 2020. Retrieved February 6, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ck5w/