M3.8 Earthquake 59 km W of Nanwalek, Alaska — October 22, 2023
2023-10-22 20:14:00 UTC (2023-10-22) · approx. 10:14 AM UTC-10 local
On October 22, 2023 at 20:14 UTC, a magnitude 3.8 intermediate depth earthquake struck 59 km W of Nanwalek, Alaska, at a depth of 80.6 km and coordinates 59.3345°, -152.9581°. The earthquake was reported felt by 4 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.0 (weak).
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 4 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
-152.9581°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.8 earthquake near Nanwalek, Alaska?
The magnitude 3.8 earthquake that struck 59 km W of Nanwalek, Alaska on October 22, 2023 at 20:14 UTC had a depth of 80.6 km. It was felt by 4 people with maximum shaking intensity of MMI 3.0 (weak). 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 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak023dk7iyjo). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 22, 2023). M3.8 Earthquake 59 km W of Nanwalek, Alaska — October 22, 2023. Retrieved January 4, 2024 from https://www.earthquaketracker.org/earthquakes/event/ak023dk7iyjo/