M3.0 Earthquake 102 km SSE of Sand Point, Alaska — March 31, 2021
2021-03-31 23:26:05 UTC (2021-03-31) · approx. 12:26 PM UTC-11 local
On March 31, 2021 at 23:26 UTC, a magnitude 3.0 shallow crustal earthquake struck 102 km SSE of Sand Point, Alaska, at a depth of 21.4 km and coordinates 54.4709°, -159.9694°.
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
-159.9694°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.0 earthquake near Sand Point, Alaska?
The magnitude 3.0 earthquake that struck 102 km SSE of Sand Point, Alaska on March 31, 2021 at 23:26 UTC had a depth of 21.4 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.
Actions
Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000e05u). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 31, 2021). M3.0 Earthquake 102 km SSE of Sand Point, Alaska — March 31, 2021. Retrieved June 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000e05u/