M3.9 Earthquake 54 km SSE of Sand Point, Alaska — August 2, 2020
2020-08-02 18:58:33 UTC (2020-08-02) · approx. 7:58 AM UTC-11 local
On August 2, 2020 at 18:58 UTC, a magnitude 3.9 shallow crustal earthquake struck 54 km SSE of Sand Point, Alaska, at a depth of 33.1 km and coordinates 54.8662°, -160.2854°.
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 2 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
-160.2854°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Sand Point, Alaska?
The magnitude 3.9 earthquake that struck 54 km SSE of Sand Point, Alaska on August 2, 2020 at 18:58 UTC had a depth of 33.1 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.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000b8ec). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 2, 2020). M3.9 Earthquake 54 km SSE of Sand Point, Alaska — August 2, 2020. Retrieved October 10, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000b8ec/