M3.3 Earthquake 111 km SSW of Sand Point, Alaska — July 23, 2020
2020-07-23 23:27:54 UTC (2020-07-23) · approx. 12:27 PM UTC-11 local
On July 23, 2020 at 23:27 UTC, a magnitude 3.3 shallow crustal earthquake struck 111 km SSW of Sand Point, Alaska, at a depth of 4.5 km and coordinates 54.3784°, -161.0058°.
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
-161.0058°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Sand Point, Alaska?
The magnitude 3.3 earthquake that struck 111 km SSW of Sand Point, Alaska on July 23, 2020 at 23:27 UTC had a depth of 4.5 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.
Actions
Understanding This Data
Magnitude 3.3 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0209ff10mu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 23, 2020). M3.3 Earthquake 111 km SSW of Sand Point, Alaska — July 23, 2020. Retrieved August 19, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak0209ff10mu/