M5.0 Earthquake 66 km SE of Kokhanok, Alaska — July 28, 2023
2023-07-28 19:11:22 UTC (2023-07-28) · approx. 9:11 AM UTC-10 local
Felt by 195 people across surrounding communities.
On July 28, 2023 at 19:11 UTC, a magnitude 5.0 intermediate depth earthquake struck 66 km SE of Kokhanok, Alaska, at a depth of 106.6 km and coordinates 59.0039°, -153.9767°.
Physical scale: An earthquake of magnitude 5.0 releases seismic energy equivalent to roughly 477 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.7 km — 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 195 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
-153.9767°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.0 earthquake near Kokhanok, Alaska?
The magnitude 5.0 earthquake that struck 66 km SE of Kokhanok, Alaska on July 28, 2023 at 19:11 UTC had a depth of 106.6 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 59.0039°, -153.9767°, which is 66 km SE of Kokhanok, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.0 earthquakes can continue for days to weeks 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 5.0 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: ak0239lyp68s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 28, 2023). M5.0 Earthquake 66 km SE of Kokhanok, Alaska — July 28, 2023. Retrieved July 13, 2025 from https://www.earthquaketracker.org/earthquakes/event/ak0239lyp68s/