M3.0 Earthquake 3 km W of Mountain Iron, Minnesota — September 15, 2021
2021-09-15 17:13:05 UTC (2021-09-15) · approx. 11:13 AM UTC-6 local
On September 15, 2021 at 17:13 UTC, a magnitude 3.0 shallow crustal earthquake struck 3 km W of Mountain Iron, Minnesota, at a depth of 0.0 km and coordinates 47.5334°, -92.6733°.
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
-92.6733°E
Technical Information
Common Questions
How strong was the magnitude 3.0 earthquake near Mountain Iron, Minnesota?
The magnitude 3.0 earthquake that struck 3 km W of Mountain Iron, Minnesota on September 15, 2021 at 17:13 UTC had a depth of 0.0 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.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000fbj1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 15, 2021). M3.0 Earthquake 3 km W of Mountain Iron, Minnesota — September 15, 2021. Retrieved November 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fbj1/