M3.3 Earthquake 158 km E of McCarthy, Alaska — August 9, 2023
2023-08-09 21:49:41 UTC (2023-08-09) · approx. 12:49 PM UTC-9 local
On August 9, 2023 at 21:49 UTC, a magnitude 3.3 shallow crustal earthquake struck 158 km E of McCarthy, Alaska, at a depth of 8.9 km and coordinates 61.3537°, -139.9693°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-139.9693°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near McCarthy, Alaska?
The magnitude 3.3 earthquake that struck 158 km E of McCarthy, Alaska on August 9, 2023 at 21:49 UTC had a depth of 8.9 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 3.3 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak023a5uke5j). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 9, 2023). M3.3 Earthquake 158 km E of McCarthy, Alaska — August 9, 2023. Retrieved August 23, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak023a5uke5j/