M3.1 Earthquake 9 km ENE of Anoka, Nebraska — June 4, 2021
2021-06-04 22:50:40 UTC (2021-06-04) · approx. 3:50 PM UTC-7 local
Felt by 24 people across nearby locations.
On June 4, 2021 at 22:50 UTC, a magnitude 3.1 shallow crustal earthquake struck 9 km ENE of Anoka, Nebraska, at a depth of 5.0 km and coordinates 42.9962°, -98.7287°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 674 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 83 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 24 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-98.7287°E
Technical Information
Common Questions
How strong was the magnitude 3.1 earthquake near Anoka, Nebraska?
The magnitude 3.1 earthquake that struck 9 km ENE of Anoka, Nebraska on June 4, 2021 at 22:50 UTC had a depth of 5.0 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 42.9962°, -98.7287°, which is 9 km ENE of Anoka, Nebraska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.1 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000e9v5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 4, 2021). M3.1 Earthquake 9 km ENE of Anoka, Nebraska — June 4, 2021. Retrieved December 14, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000e9v5/