M4.0 Earthquake 57 km SSE of Sand Point, Alaska — June 30, 2021
2021-06-30 21:50:07 UTC (2021-06-30) · approx. 10:50 AM UTC-11 local
On June 30, 2021 at 21:50 UTC, a magnitude 4.0 shallow crustal earthquake struck 57 km SSE of Sand Point, Alaska, at a depth of 43.5 km and coordinates 54.8469°, -160.2183°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-160.2183°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Sand Point, Alaska?
The magnitude 4.0 earthquake that struck 57 km SSE of Sand Point, Alaska on June 30, 2021 at 21:50 UTC had a depth of 43.5 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000ehv0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 30, 2021). M4.0 Earthquake 57 km SSE of Sand Point, Alaska — June 30, 2021. Retrieved September 9, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ehv0/