M3.0 Earthquake 156 km SE of Old Harbor, Alaska — August 20, 2020
2020-08-20 20:43:20 UTC (2020-08-20) · approx. 10:43 AM UTC-10 local
On August 20, 2020 at 20:43 UTC, a magnitude 3.0 shallow crustal earthquake struck 156 km SE of Old Harbor, Alaska, at a depth of 14.8 km and coordinates 56.2362°, -151.4462°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-151.4462°E
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Common Questions
How strong was the magnitude 3.0 earthquake near Old Harbor, Alaska?
The magnitude 3.0 earthquake that struck 156 km SE of Old Harbor, Alaska on August 20, 2020 at 20:43 UTC had a depth of 14.8 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak020apodrq3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 20, 2020). M3.0 Earthquake 156 km SE of Old Harbor, Alaska — August 20, 2020. Retrieved October 31, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak020apodrq3/