M2.5 Earthquake near Southern Alaska — September 20, 2023
2023-09-20 20:08:23 UTC (2023-09-20) · approx. 10:08 AM UTC-10 local
On September 20, 2023 at 20:08 UTC, a magnitude 2.5 intermediate depth earthquake struck near Southern Alaska, at a depth of 158.5 km and coordinates 60.0132°, -153.4754°.
Physical scale: An earthquake of magnitude 2.5 releases seismic energy equivalent to roughly 84.8 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 32 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response 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
-153.4754°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.5 earthquake near Southern Alaska?
The magnitude 2.5 earthquake that struck near Southern Alaska on September 20, 2023 at 20:08 UTC had a depth of 158.5 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 2.5 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 2.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak023c3aaphi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 20, 2023). M2.5 Earthquake near Southern Alaska — September 20, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak023c3aaphi/