EARTHQUAKEM4.9

M4.9 earthquake near Hihifo, Tonga

Map: the earthquake near Hihifo, Tonga, with plate boundaries

A magnitude 4.9 earthquake struck 104 km (65 mi) north-northeast of Hihifo, Tonga on Thursday, October 22, 2026 at 19:06 UTC, at a depth of 23 km (15 mi), according to the U.S. Geological Survey. Shallow quakes like this one shake the surface hardest.

MagnitudeM4.9
Depth23 km (15 mi)
Time (UTC)Oct 22 19:06
Location15.13°S 173.33°W
Nearest townHihifo · 104 km
Energy338 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 44 km (27 mi) from the boundary between the Pacific and Australian 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 4.9 released roughly the energy of 338 tons of TNT. That is about 22 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 7,900,000 times more than this one.

Aftershocks

In the first 3 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 253 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 22, 2026 or earthquakes by day.

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