EARTHQUAKEM4.6

M4.6 earthquake near Rabaul, Papua New Guinea

Map: the earthquake near Rabaul, Papua New Guinea, with plate boundaries

A magnitude 4.6 earthquake struck 51 km (32 mi) north-northwest of Rabaul, Papua New Guinea on Saturday, October 10, 2026 at 15:10 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.

MagnitudeM4.6
Depth10 km (6 mi)
Time (UTC)Oct 10 15:10
Location3.77°S 151.98°E
Nearest townRabaul · 51 km
Energy120 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 193 km (120 mi) from the boundary between the Pacific and North Bismarck 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.

Aftershocks

In the first 16 days after it, USGS recorded no smaller earthquakes of magnitude 2.5 or more within 100 km (62 mi).

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 395 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 10, 2026 or earthquakes by day.

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