M4.8 Earthquake near Charneca de Caparica, Portugal — 17 February 2025

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 4.8 earthquake radiates roughly 239 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 597, 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.

That is about 12:47 local solar time at the epicentre, around midday.

This event was shallower than 93% of the 15 earthquakes recorded in Portugal in our catalogue and stronger than 60% of them.

The epicentre was located at 38.5878, -9.1875 — 3 km south of Charneca de Caparica. The closest other recorded event was a magnitude 3.5 earthquake 51 km north of here on 19 February 2026.

The nearest other settlements in our records are Sobral de Monte Agraço (51 km north) and Évora (103 km east).

At 10 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.

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 M4.8 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.

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

0 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 3.5 event near Sobral de Monte Agraço on 19 February 2026. This M4.8 event released about 89 times more energy than that event.

No other earthquakes have been recorded within 100 km of this epicentre in the past year, which makes this a genuinely isolated event.

This earthquake is part of the February 2025 worldwide record, and of earthquakes in Portugal during February 2025. Browse the full monthly archive to compare periods.