M4.2 Earthquake 26 km NNW of Rioblanco, Colombia — September 23, 2026
2026-09-23 04:36:36 UTC (2026-09-23) · approx. 11:36 PM UTC-5 local
On September 23, 2026 at 04:36 UTC, a magnitude 4.2 shallow crustal earthquake struck 26 km NNW of Rioblanco, Colombia, at a depth of 10.0 km and coordinates 3.7317°, -75.7776°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-75.7776°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Rioblanco, Colombia?
The magnitude 4.2 earthquake that struck 26 km NNW of Rioblanco, Colombia on September 23, 2026 at 04:36 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000tx0s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 23, 2026). M4.2 Earthquake 26 km NNW of Rioblanco, Colombia — September 23, 2026. Retrieved October 4, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tx0s/