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M4.7 Earthquake near San Antonio, Chile — 28 April 2026

A light earthquake of magnitude 4.7 was recorded near San Antonio, Chile on , with an epicentre 70 km west-southwest of San Antonio, at a focal depth of 20.2 km. It ranked as the 4th strongest of 29 earthquakes recorded in Chile in the preceding 30 days.

4.7 Light

Time (UTC): 2026-04-28 14:55:23

Time (your timezone): —

Magnitude: 4.7 (light)

Focal depth: 20.2 km (shallow)

Epicentre: -33.9441, -72.2494

Location: 70 km WSW of San Antonio, Chile

Country: Chile

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items.

A magnitude 4.7 earthquake radiates roughly 169 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 340, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.

What the magnitude scale actually measures →

When it happened locally

That is about 10:06 local solar time at the epicentre, during the morning.

This event was shallower than 84% of the 728 earthquakes recorded in Chile in our catalogue and stronger than 82% of them.

Where was the epicentre?

The epicentre was located at -33.9441, -72.2494 — 70 km west-southwest of San Antonio. The closest other recorded event was a magnitude 4.0 earthquake 3 km southeast of here on 28 April 2026.

The nearest other settlements in our records are Cartagena (47 km north-northwest), Valparaíso (73 km north), Santa Cruz (108 km south-southeast) and Melipilla (109 km east-northeast).

Why the 20 km depth matters

At 20 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M4.7 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.

How earthquakes generate tsunamis, and what the alert levels mean →

Aftershocks and local seismic history

No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.

78 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near Valparaíso on 31 May 2026. This M4.7 event released about 89 times less energy than that event.

17 earthquakes have been recorded within 100 km of this epicentre in the past year, 5 of them in the past 30 days.

How long aftershock sequences last, and how large they get →

Where this event sits in the record

This earthquake is part of the April 2026 worldwide record, and of earthquakes in Chile during April 2026. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Chile

All recorded earthquakes in Chile →

Other magnitude 4 earthquakes worldwide

All magnitude 4 earthquakes →

Questions about this earthquake

How strong was the earthquake near San Antonio?

It measured magnitude 4.7 — a light earthquake. A magnitude 4.7 earthquake radiates roughly 169 tons of TNT equivalent in seismic energy.

How deep was the earthquake near San Antonio?

The focus was 20 km below the surface, which counts as shallow.

Was the San Antonio earthquake felt at the surface?

At magnitude 4.7 and a focal depth of 20 km, shaking would have been concentrated near the epicentre.

When did the earthquake near San Antonio happen?

28 April 2026 at 14:55 UTC.

Was there a tsunami?

No. The USGS record carries no tsunami-information link for this event.

Have there been aftershocks?

No further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event.

How often do earthquakes happen near San Antonio?

78 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near Valparaíso on 31 May 2026. This M4.7 event released about 89 times less energy than that event.