EARTHQUAKEM4.8

M4.8 earthquake near Río Grande, Panama

Map: the earthquake near Río Grande, Panama, with plate boundaries

A magnitude 4.8 earthquake struck 31 km (19 mi) west of Río Grande, Panama on Sunday, October 11, 2026 at 17:11 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 Panama City, Panama, about 269 km (167 mi) away.

MagnitudeM4.8
Depth10 km (6 mi)
Time (UTC)Oct 11 17:11
Location7.71°N 81.62°W
Nearest townRío Grande · 31 km
Energy239 tons TNT
Aftershocks M2.5+17
Tsunami flagNo
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Why here?

This earthquake struck about 73 km (45 mi) from the boundary between the Cocos and Nazca 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 4.8 released roughly the energy of 239 tons of TNT. That is about 16 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 11,000,000 times more than this one.

Aftershocks

In the first 15 days after it, USGS recorded 17 smaller earthquakes of magnitude 2.5 or more within 100 km (62 mi). The largest was a magnitude 4.7 on October 13 at 06:39 UTC.

A stronger magnitude 6.1 followed on October 12 at 23:20 UTC, about 16 km (10 mi) away, so this one is now considered a foreshock.

Outside the United States, USGS mainly lists quakes of about magnitude 4 and up, so smaller aftershocks there are undercounted.

Earthquake history here

Before this earthquake, USGS had recorded 114 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 11, 2026 or earthquakes by day.

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