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M4.3 earthquake 37 km NNW of La Serena, Coquimbo Region, Chile

A magnitude 4.3 earthquake struck 37 km NNW of La Serena, Coquimbo Region, Chile at 00:07 local time (03:07 UTC) on 23 Sept 2026, at a depth of 60 km, according to USGS and GFZ.

Reported by 2 agencies · revised from M4.1 · 1 reports to USGS “Did You Feel It?”

Data: USGS, GFZ · updated 2026-10-04 00:59 UTC · reviewed

Magnitude
4.3light
body-wave magnitude (mb)
revised from 4.1
Depth
60.4 km
Status
Reviewed
Origin time
2026-09-23 03:07:08 UTC
Local: 23 Sept 2026, 00:07:08 (America/Santiago)
Epicentre
29.620° S, 71.431° W

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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
La SerenaCoquimbo Region, Chile · pop. 154,52137 kmIIWeak
CoquimboCoquimbo Region, Chile · pop. 161,31738 kmIIWeak
VicuñaCoquimbo Region, Chile · pop. 27,77184 kmIIWeak
OvalleCoquimbo Region, Chile · pop. 77,138111 kmIIWeak
Viña del MarValparaiso, Chile · pop. 334,248378 kmINot felt
ValparaísoValparaiso, Chile · pop. 282,448381 kmINot 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
GFZGFZ via GEOFON, GFZ Helmholtz Centre for Geosciences4.1 Mw50 km29.62° S, 71.44° W+0.3 sAutomatic
USGSheadlineUSGS NEIC via U.S. Geological Survey4.3 mbwas 4.260.4 km29.62° S, 71.43° W–Reviewed · 1 revision

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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 60 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

No later earthquakes have been recorded within 30 km so far. 1 in the 7 days before. 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.

How strong was the shaking where you were?

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Reports on SeismoAtlas

No reports yet.

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

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Event id gfz2026sqkm. First recorded here 28 Sept 2026, 17:32:06 UTC. Solutions: GFZ (geofon:gfz2026sqkm); USGS (usgs:us6000tx0f). Cite as: SeismoAtlas, “M4.3 earthquake 37 km NNW of La Serena, Coquimbo Region, Chile”, https://seismoatlas.com/earthquake/gfz2026sqkm-m4-3-earthquake-37-km-nnw-of-la-serena-coquimbo-region-chile, data from USGS, GFZ.

JSON: /api/v1/events/gfz2026sqkm. SeismoAtlas is not an official warning service.