M3.7 Earthquake 18 km NE of Yakutat, Alaska — July 23, 2020
2020-07-23 21:59:43 UTC (2020-07-23) · approx. 12:59 PM UTC-9 local
On July 23, 2020 at 21:59 UTC, a magnitude 3.7 shallow crustal earthquake struck 18 km NE of Yakutat, Alaska, at a depth of 20.9 km and coordinates 59.6594°, -139.4746°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-139.4746°E
Technical Information
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Common Questions
How strong was the magnitude 3.7 earthquake near Yakutat, Alaska?
The magnitude 3.7 earthquake that struck 18 km NE of Yakutat, Alaska on July 23, 2020 at 21:59 UTC had a depth of 20.9 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0209fe0zja). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 23, 2020). M3.7 Earthquake 18 km NE of Yakutat, Alaska — July 23, 2020. Retrieved October 3, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak0209fe0zja/