M3.5 Earthquake 72 km ESE of Denali National Park, Alaska — July 30, 2023
2023-07-30 16:25:49 UTC (2023-07-30) · approx. 6:25 AM UTC-10 local
On July 30, 2023 at 16:25 UTC, a magnitude 3.5 intermediate depth earthquake struck 72 km ESE of Denali National Park, Alaska, at a depth of 116.1 km and coordinates 63.2144°, -150.4758°.
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 29 days ago 52 km E of Denali National Park, Alaska. Since the mainshock, the USGS has recorded 11 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-150.4758°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.5 earthquake near Denali National Park, Alaska?
The magnitude 3.5 earthquake that struck 72 km ESE of Denali National Park, Alaska on July 30, 2023 at 16:25 UTC had a depth of 116.1 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 3.5 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 3.5 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 52 km E of Denali National Park, Alaska. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0239p82mi7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 30, 2023). M3.5 Earthquake 72 km ESE of Denali National Park, Alaska — July 30, 2023. Retrieved October 7, 2023 from https://www.earthquaketracker.org/earthquakes/event/ak0239p82mi7/