M3.1 Earthquake 32 km WSW of Salcha, Alaska — November 5, 2021
2021-11-05 22:12:38 UTC (2021-11-05) · approx. 12:12 PM UTC-10 local
Felt by 46 people across nearby locations.
On November 5, 2021 at 22:12 UTC, a magnitude 3.1 shallow crustal earthquake struck 32 km WSW of Salcha, Alaska, at a depth of 8.3 km and coordinates 64.4016°, -147.5173°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Alaska, a region characterized by Pacific Plate subduction beneath the North American Plate, producing frequent megathrust and crustal earthquakes along the Aleutian arc. The nearest mapped fault system is the Aleutian megathrust. View all earthquakes in Alaska.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 46 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-147.5173°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Salcha, Alaska?
The magnitude 3.1 earthquake that struck 32 km WSW of Salcha, Alaska on November 5, 2021 at 22:12 UTC had a depth of 8.3 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 64.4016°, -147.5173°, which is 32 km WSW of Salcha, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.1 earthquakes can continue for several days and gradually diminish over time.
Has Alaska had earthquakes this big before?
The largest recorded earthquake in Alaska was the M9.2 Great Alaska earthquake of March 27, 1964. Today's magnitude 3.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: ak021e7e8fgh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 5, 2021). M3.1 Earthquake 32 km WSW of Salcha, Alaska — November 5, 2021. Retrieved January 15, 2022 from https://www.earthquaketracker.org/earthquakes/event/ak021e7e8fgh/