M3.4 Earthquake 92 km ESE of Attu Station, Alaska — October 2, 2021
2021-10-02 20:53:11 UTC (2021-10-02) · approx. 8:53 AM UTC+12 local
On October 2, 2021 at 20:53 UTC, a magnitude 3.4 intermediate depth earthquake struck 92 km ESE of Attu Station, Alaska, at a depth of 70.9 km and coordinates 52.5857°, 174.4802°.
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
174.4802°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Attu Station, Alaska?
The magnitude 3.4 earthquake that struck 92 km ESE of Attu Station, Alaska on October 2, 2021 at 20:53 UTC had a depth of 70.9 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: us6000fsmh). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 2, 2021). M3.4 Earthquake 92 km ESE of Attu Station, Alaska — October 2, 2021. Retrieved December 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fsmh/