M3.4 Earthquake 82 km SW of Adak, Alaska — May 31, 2021
2021-05-31 23:54:58 UTC (2021-05-31) · approx. 11:54 AM UTC-12 local
On May 31, 2021 at 23:54 UTC, a magnitude 3.4 shallow crustal earthquake struck 82 km SW of Adak, Alaska, at a depth of 45.3 km and coordinates 51.4139°, -177.5717°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-177.5717°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Adak, Alaska?
The magnitude 3.4 earthquake that struck 82 km SW of Adak, Alaska on May 31, 2021 at 23:54 UTC had a depth of 45.3 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 3.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000eba7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, May 31, 2021). M3.4 Earthquake 82 km SW of Adak, Alaska — May 31, 2021. Retrieved August 7, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000eba7/