M3.5 Earthquake 103 km W of Adak, Alaska — September 11, 2020
2020-09-11 18:58:16 UTC (2020-09-11) · approx. 6:58 AM UTC-12 local
On September 11, 2020 at 18:58 UTC, a magnitude 3.5 shallow crustal earthquake struck 103 km W of Adak, Alaska, at a depth of 16.8 km and coordinates 51.8345°, -178.1358°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-178.1358°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near Adak, Alaska?
The magnitude 3.5 earthquake that struck 103 km W of Adak, Alaska on September 11, 2020 at 18:58 UTC had a depth of 16.8 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 3.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000bm1j). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 11, 2020). M3.5 Earthquake 103 km W of Adak, Alaska — September 11, 2020. Retrieved November 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bm1j/