M2.9 Earthquake 8 km N of Segundo, Colorado — March 18, 2023
2023-03-18 23:09:58 UTC (2023-03-18) · approx. 4:09 PM UTC-7 local
Felt by 10 people across nearby locations.
On March 18, 2023 at 23:09 UTC, a magnitude 2.9 shallow crustal earthquake struck 8 km N of Segundo, Colorado, at a depth of 6.5 km and coordinates 37.1994°, -104.7497°. This earthquake was detected by 17 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 133, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 2.9 releases seismic energy equivalent to roughly 338 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 60 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 10 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
-104.7497°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.9 earthquake near Segundo, Colorado?
The magnitude 2.9 earthquake that struck 8 km N of Segundo, Colorado on March 18, 2023 at 23:09 UTC had a depth of 6.5 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 37.1994°, -104.7497°, which is 8 km N of Segundo, Colorado.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.9 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000jl5u). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 18, 2023). M2.9 Earthquake 8 km N of Segundo, Colorado — March 18, 2023. Retrieved May 20, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jl5u/