M2.5 Earthquake 23 km SE of Virginia City, Montana — July 18, 2021
2021-07-18 23:16:57 UTC (2021-07-18) · approx. 4:16 PM UTC-7 local
On July 18, 2021 at 23:16 UTC, a magnitude 2.5 shallow crustal earthquake struck 23 km SE of Virginia City, Montana, at a depth of 8.1 km and coordinates 45.1274°, -111.7679°.
Physical scale: An earthquake of magnitude 2.5 releases seismic energy equivalent to roughly 84.8 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 32 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 2 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
-111.7679°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.5 earthquake near Virginia City, Montana?
The magnitude 2.5 earthquake that struck 23 km SE of Virginia City, Montana on July 18, 2021 at 23:16 UTC had a depth of 8.1 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 2.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 2.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000ena4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 18, 2021). M2.5 Earthquake 23 km SE of Virginia City, Montana — July 18, 2021. Retrieved September 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ena4/