M3.3 Earthquake 250 km ESE of Chiniak, Alaska — July 10, 2020
2020-07-10 16:12:38 UTC (2020-07-10) · approx. 6:12 AM UTC-10 local
On July 10, 2020 at 16:12 UTC, a magnitude 3.3 shallow crustal earthquake struck 250 km ESE of Chiniak, Alaska, at a depth of 19.8 km and coordinates 56.5178°, -148.6750°.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-148.6750°E
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Common Questions
How strong was the magnitude 3.3 earthquake near Chiniak, Alaska?
The magnitude 3.3 earthquake that struck 250 km ESE of Chiniak, Alaska on July 10, 2020 at 16:12 UTC had a depth of 19.8 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 3.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000alhf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 10, 2020). M3.3 Earthquake 250 km ESE of Chiniak, Alaska — July 10, 2020. Retrieved September 19, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000alhf/