M3.9 Earthquake 38 km WNW of Nanwalek, Alaska — August 22, 2020
2020-08-22 22:25:53 UTC (2020-08-22) · approx. 12:25 PM UTC-10 local
On August 22, 2020 at 22:25 UTC, a magnitude 3.9 intermediate depth earthquake struck 38 km WNW of Nanwalek, Alaska, at a depth of 73.3 km and coordinates 59.4733°, -152.5631°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 3 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-152.5631°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Nanwalek, Alaska?
The magnitude 3.9 earthquake that struck 38 km WNW of Nanwalek, Alaska on August 22, 2020 at 22:25 UTC had a depth of 73.3 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 3.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak020at0jk8z). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 22, 2020). M3.9 Earthquake 38 km WNW of Nanwalek, Alaska — August 22, 2020. Retrieved October 31, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak020at0jk8z/