M3.5 Earthquake 48 km SSE of King Salmon, Alaska — January 18, 2021
2021-01-18 21:43:21 UTC (2021-01-18) · approx. 11:43 AM UTC-10 local
On January 18, 2021 at 21:43 UTC, a magnitude 3.5 intermediate depth earthquake struck 48 km SSE of King Salmon, Alaska, at a depth of 166.3 km and coordinates 58.3263°, -156.2033°.
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.
Earthquake Details
-156.2033°E
Technical Information
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Common Questions
How strong was the magnitude 3.5 earthquake near King Salmon, Alaska?
The magnitude 3.5 earthquake that struck 48 km SSE of King Salmon, Alaska on January 18, 2021 at 21:43 UTC had a depth of 166.3 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.
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Understanding This Data
Magnitude 3.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak021u4flzn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 18, 2021). M3.5 Earthquake 48 km SSE of King Salmon, Alaska — January 18, 2021. Retrieved March 27, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak021u4flzn/