EARTHQUAKEM4.6

M4.6 earthquake near Mosteiros, Portugal

Map: the earthquake near Mosteiros, Portugal, with plate boundaries

A magnitude 4.6 earthquake struck 41 km (25 mi) west of Mosteiros, Portugal on Thursday, October 29, 2026 at 07:54 UTC, at a depth of 10 km (6 mi), according to the U.S. Geological Survey. Shallow quakes like this one shake the surface hardest. The nearest city of a million or more people is Lisbon, about 1,497 km (930 mi) away.

MagnitudeM4.6
Depth10 km (6 mi)
Time (UTC)Oct 29 07:54
Location37.91°N 26.30°W
Nearest townMosteiros · 41 km
Energy120 tons TNT
Tsunami flagNo
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Why here?

This earthquake struck right along the boundary between the Eurasian and African plates. Most earthquakes happen along plate boundaries like this one, where the pieces of Earth’s outer shell collide, pull apart or grind past each other. Stress builds up over years until the rock suddenly slips.

The red lines on the map are plate boundaries.

How strong was it?

Magnitude is logarithmic: each whole step releases about 32 times more energy. This magnitude 4.6 released roughly the energy of 120 tons of TNT. That is about 7.9 times the energy of a magnitude 4.0, a quake people nearby feel but that rarely causes damage. The strongest earthquake ever recorded, magnitude 9.5 in Chile in 1960, released about 22,000,000 times more than this one.

Earthquake history here

Before this earthquake, USGS had recorded 5 earthquakes of magnitude 6 or larger within 300 km (186 mi) since 1900. The strongest:

Official details, updates and the shaking map: USGS event page.

See every earthquake on October 29, 2026 or earthquakes by day.

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