M3.0 Earthquake 229 km S of Unalaska, Alaska — September 13, 2020
2020-09-13 22:59:48 UTC (2020-09-13) · approx. 11:59 AM UTC-11 local
On September 13, 2020 at 22:59 UTC, a magnitude 3.0 shallow crustal earthquake struck 229 km S of Unalaska, Alaska, at a depth of 10.0 km and coordinates 51.8381°, -165.9893°.
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
-165.9893°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Unalaska, Alaska?
The magnitude 3.0 earthquake that struck 229 km S of Unalaska, Alaska on September 13, 2020 at 22:59 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: us6000c05x). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 13, 2020). M3.0 Earthquake 229 km S of Unalaska, Alaska — September 13, 2020. Retrieved November 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c05x/