M4.3 Earthquake 241 km SE of Chiniak, Alaska — March 31, 2024
2024-03-31 23:56:51 UTC (2024-03-31) · approx. 1:56 PM UTC-10 local
On March 31, 2024 at 23:56 UTC, a magnitude 4.3 shallow crustal earthquake struck 241 km SE of Chiniak, Alaska, at a depth of 13.1 km and coordinates 55.9718°, -149.6909°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 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
-149.6909°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Chiniak, Alaska?
The magnitude 4.3 earthquake that struck 241 km SE of Chiniak, Alaska on March 31, 2024 at 23:56 UTC had a depth of 13.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000m94h). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, March 31, 2024). M4.3 Earthquake 241 km SE of Chiniak, Alaska — March 31, 2024. Retrieved June 1, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000m94h/