M4.3 Earthquake 192 km WSW of Yakutat, Alaska — October 19, 2021
2021-10-19 18:17:18 UTC (2021-10-19) · approx. 8:17 AM UTC-10 local
On October 19, 2021 at 18:17 UTC, a magnitude 4.3 shallow crustal earthquake struck 192 km WSW of Yakutat, Alaska, at a depth of 10.0 km and coordinates 58.8758°, -142.8284°.
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
-142.8284°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Yakutat, Alaska?
The magnitude 4.3 earthquake that struck 192 km WSW of Yakutat, Alaska on October 19, 2021 at 18:17 UTC had a depth of 10.0 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: us6000fvy5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 19, 2021). M4.3 Earthquake 192 km WSW of Yakutat, Alaska — October 19, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fvy5/