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M4.3 earthquake 21 km SSW of Roncesvalles, Tolima Department, Colombia

A magnitude 4.3 earthquake struck 21 km SSW of Roncesvalles, Tolima Department, Colombia at 11:23 local time (16:23 UTC) on 21 Sept 2026, at a depth of 10 km, according to USGS.

1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-09-26 16:58 UTC · reviewed

Magnitude
4.3light
body-wave magnitude (mb)
Depth
10 km
Status
Reviewed
Origin time
2026-09-21 16:23:20 UTC
Local: 21 Sept 2026, 11:23:20 (America/Bogota)
Epicentre
3.844° N, 75.687° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
RoncesvallesTolima Department, Colombia · pop. 6,34021 kmIVLight
San AntonioTolima Department, Colombia · pop. 5,18524 kmIVLight
SevillaValle del Cauca Department, Colombia · pop. 43,73854 kmIIIWeak
CaicedoniaValle del Cauca Department, Colombia · pop. 32,41756 kmIIIWeak
TuluáValle del Cauca Department, Colombia · pop. 221,68463 kmIIWeak
RoviraTolima Department, Colombia · pop. 20,45266 kmIIWeak
PalmiraValle del Cauca Department, Colombia · pop. 312,51976 kmIIWeak
ArmeniaQuindío Department, Colombia · pop. 304,31477 kmIIWeak

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 59 km.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGSheadlineUSGS NEIC via U.S. Geological Survey4.3 mb10 km3.84° N, 75.69° W–Reviewed

How big was it?

Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.

It released roughly the energy of 43 t of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 10 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M4.3 releases about 32× the energy of M3.3, and its waves are about 10× taller on a seismogram. Energy: 43 t of TNT vs 1.3 t of TNT.

Each square is the energy of one M3.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

14 later earthquakes within 30 km; the largest was M4.6 5 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M4.3

14 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.424.510
6.584.210
6.874.413
18.264.110
29.824.410
36.224.410
36.394.310
40.684.210
51.774.675
72.394.610
72.854.210
86.944.557
110.254.610
160.284.531
  1. 4.69 km S of San Antonio, Tolima Department, Colombia09-23 20:09
  2. 4.622 km NNW of Rioblanco, Tolima Department, Colombia09-24 16:46
  3. 4.626 km W of Roncesvalles, Tolima Department, Colombia09-26 06:38
  4. 4.5Near San Antonio, Tolima Department, Colombia09-21 18:48
  5. 4.520 km N of Rioblanco, Tolima Department, Colombia09-28 08:39
  6. 4.526 km NNW of Rioblanco, Tolima Department, Colombia09-25 07:19
  7. 4.423 km SSW of Roncesvalles, Tolima Department, Colombia09-21 23:15
  8. 4.421 km WSW of Roncesvalles, Tolima Department, Colombia09-22 22:12
  9. 4.421 km NNW of Rioblanco, Tolima Department, Colombia09-23 04:36
  10. 4.320 km SSW of Roncesvalles, Tolima Department, Colombia09-23 04:46
  11. 4.2Near Roncesvalles, Tolima Department, Colombia09-21 22:58
  12. 4.218 km SW of Roncesvalles, Tolima Department, Colombia09-23 09:04
  13. 4.229 km WSW of Roncesvalles, Tolima Department, Colombia09-24 17:14
  14. 4.126 km SW of Roncesvalles, Tolima Department, Colombia09-22 10:38

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id us7000tiz7. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS (usgs:us7000tiz7). Cite as: SeismoAtlas, “M4.3 earthquake 21 km SSW of Roncesvalles, Tolima Department, Colombia”, https://seismoatlas.com/earthquake/us7000tiz7-m4-3-earthquake-21-km-ssw-of-roncesvalles-tolima-department-colombia, data from USGS.

JSON: /api/v1/events/us7000tiz7. SeismoAtlas is not an official warning service.