M3.8 Earthquake 194 km SSE of Attu Station, Alaska — September 4, 2022
2022-09-04 21:56:12 UTC (2022-09-04) · approx. 9:56 AM UTC+12 local
On September 4, 2022 at 21:56 UTC, a magnitude 3.8 shallow crustal earthquake struck 194 km SSE of Attu Station, Alaska, at a depth of 10.0 km and coordinates 51.3104°, 174.5317°.
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
Earthquake Details
174.5317°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.8 earthquake near Attu Station, Alaska?
The magnitude 3.8 earthquake that struck 194 km SSE of Attu Station, Alaska on September 4, 2022 at 21:56 UTC had a depth of 10.0 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 3.8 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: us7000i583). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, September 4, 2022). M3.8 Earthquake 194 km SSE of Attu Station, Alaska — September 4, 2022. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000i583/