M3.4 Earthquake 33 km WSW of Birney, Montana — May 18, 2021
2021-05-18 19:12:40 UTC (2021-05-18) · approx. 12:12 PM UTC-7 local
On May 18, 2021 at 19:12 UTC, a magnitude 3.4 shallow crustal earthquake struck 33 km WSW of Birney, Montana, at a depth of 0.0 km and coordinates 45.1627°, -106.8754°.
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
-106.8754°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Birney, Montana?
The magnitude 3.4 earthquake that struck 33 km WSW of Birney, Montana on May 18, 2021 at 19:12 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 3.4 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: us7000e47t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, May 18, 2021). M3.4 Earthquake 33 km WSW of Birney, Montana — May 18, 2021. Retrieved July 24, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000e47t/