M3.9 Earthquake near Rat Islands, Aleutian Islands, Alaska — November 29, 2021
2021-11-29 18:36:11 UTC (2021-11-29) · approx. 6:36 AM UTC+12 local
On November 29, 2021 at 18:36 UTC, a magnitude 3.9 shallow crustal earthquake struck near Rat Islands, Aleutian Islands, Alaska, at a depth of 56.8 km and coordinates 51.5294°, 179.1121°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
179.1121°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Rat Islands, Aleutian Islands, Alaska?
The magnitude 3.9 earthquake that struck near Rat Islands, Aleutian Islands, Alaska on November 29, 2021 at 18:36 UTC had a depth of 56.8 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 3.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000g8ra). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 29, 2021). M3.9 Earthquake near Rat Islands, Aleutian Islands, Alaska — November 29, 2021. Retrieved February 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000g8ra/