M3.6 Earthquake 8 km NNW of Segundo, Colorado — September 10, 2023
2023-09-10 23:46:12 UTC (2023-09-10) · approx. 4:46 PM UTC-7 local
Felt by 26 people across nearby locations. Maximum shaking intensity MMI 4.7 (moderate).
On September 10, 2023 at 23:46 UTC, a magnitude 3.6 shallow crustal earthquake struck 8 km NNW of Segundo, Colorado, at a depth of 2.0 km and coordinates 37.1967°, -104.7813°. The earthquake was reported felt by 26 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.7 (moderate). This earthquake was detected by 28 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 214, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 3.6 releases seismic energy equivalent to roughly 3.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 184 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 26 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
-104.7813°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.6 earthquake near Segundo, Colorado?
The magnitude 3.6 earthquake that struck 8 km NNW of Segundo, Colorado on September 10, 2023 at 23:46 UTC had a depth of 2.0 km. It was felt by 26 people with maximum shaking intensity of MMI 4.7 (moderate). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 37.1967°, -104.7813°, which is 8 km NNW of Segundo, Colorado.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.6 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000kuwn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 10, 2023). M3.6 Earthquake 8 km NNW of Segundo, Colorado — September 10, 2023. Retrieved November 18, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kuwn/