Earthquake.now

M4.2 Earthquake near Antofagasta de la Sierra, Argentina — 28 May 2025

A light earthquake of magnitude 4.2 was recorded near Antofagasta de la Sierra, Argentina on , with an epicentre 182 km north-northwest of Antofagasta de la Sierra, at a focal depth of 142.6 km. It ranked as the 78th strongest of 85 earthquakes recorded in Argentina in the preceding 30 days.

4.2 Light

Time (UTC): 2025-05-28 00:03:21

Time (your timezone): —

Magnitude: 4.2 (light)

Focal depth: 142.6 km (intermediate)

Epicentre: -24.5747, -68.1858

Location: 182 km NNW of Antofagasta de la Sierra, Argentina

Country: Argentina

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 4.2 earthquake radiates roughly 30 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 271, 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 19:30 local solar time at the epicentre, in the evening.

This event was shallower than 56% of the 386 earthquakes recorded in Argentina in our catalogue and stronger than 19% of them.

Where was the epicentre?

The epicentre was located at -24.5747, -68.1858 — 182 km north-northwest of Antofagasta de la Sierra. The closest other recorded event was a magnitude 4.6 earthquake 83 km north of here on 22 July 2026.

The nearest other settlements in our records are San Antonio de los Cobres (27 km east-northeast), Tolar Grande (81 km east-northeast), Antofagasta (92 km west) and Municipio de Tolar Grande (94 km east).

Why the 143 km depth matters

At 143 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.

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 intermediate depth normally reduces peak shaking near the epicentre compared with a shallow 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 M4.2 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 143 km focal depth is too great to deform the sea floor significantly; 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

2 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.2.

246 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.1 event near San Pedro de Atacama on 06 March 2025. This M4.2 event released about 708 times less energy than that event.

11 earthquakes have been recorded within 100 km of this epicentre in the past year, 4 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 May 2025 worldwide record, and of earthquakes in Argentina during May 2025. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Argentina

All recorded earthquakes in Argentina →

Other magnitude 4 earthquakes worldwide

All magnitude 4 earthquakes →

Questions about this earthquake

How strong was the earthquake near Antofagasta de la Sierra?

It measured magnitude 4.2 — a light earthquake. A magnitude 4.2 earthquake radiates roughly 30 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Antofagasta de la Sierra?

The focus was 143 km below the surface, which counts as intermediate.

Was the Antofagasta de la Sierra earthquake felt at the surface?

At magnitude 4.2 and a focal depth of 143 km, the depth spreads the energy out, so shaking is weaker overhead but reaches further.

When did the earthquake near Antofagasta de la Sierra happen?

28 May 2025 at 00:03 UTC.

Was there a tsunami?

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

Have there been aftershocks?

2 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 4.2.

How often do earthquakes happen near Antofagasta de la Sierra?

246 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.1 event near San Pedro de Atacama on 06 March 2025. This M4.2 event released about 708 times less energy than that event.