M4.6 earthquake – Chile-Argentina Border Region
A magnitude 4.6 earthquake struck in the Chile-Argentina Border region at 13:48 local time (16:48 UTC) on 23 Sept 2026, at a depth of 193 km, according to USGS and GFZ.
Reported by 2 agencies · revised from M4.3
Data: USGS, GFZ · updated 2026-09-24 09:33 UTC · reviewed
- Magnitude
- 4.6light
body-wave magnitude (mb)
revised from 4.3 - Depth
- 193.2 km
- Status
- Reviewed
- Origin time
- 2026-09-23 16:48:37 UTC
- Local: 23 Sept 2026, 13:48:37 (America/Argentina/Salta)
- Epicentre
- 24.081° S, 66.889° 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
| Place | Distance | Est. shaking |
|---|---|---|
| San Salvador de JujuyJujuy, Argentina · pop. 257,970 | 163 km | INot felt |
| SaltaArgentina · pop. 520,683 | 169 km | INot felt |
| San Miguel de TucumánTucuman, Argentina · pop. 548,866 | 348 km | INot felt |
| AntofagastaChile · pop. 401,096 | 360 km | INot felt |
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.
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.
How big was it?
Widely felt near the epicentre: rattling windows and objects. Significant damage is unlikely.
It released roughly the energy of 120 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 193 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.
M4.6 releases about 32× the energy of M3.6, and its waves are about 10× taller on a seismogram. Energy: 120 t of TNT vs 3.8 t of TNT.
Each square is the energy of one M3.6. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
No later earthquakes have been recorded within 30 km so far. Aftershock rates usually fall off roughly in proportion to 1/time.
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Event id gfz2026srlp. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: GFZ (geofon:gfz2026srlp); USGS (usgs:us6000tx4w). Cite as: SeismoAtlas, “M4.6 earthquake – Chile-Argentina Border Region”, https://seismoatlas.com/earthquake/gfz2026srlp-m4-6-earthquake-chile-argentina-border-region, data from USGS, GFZ.
JSON: /api/v1/events/gfz2026srlp. SeismoAtlas is not an official warning service.