EARTHQUAKEM4.5

M4.5 earthquake near Atka, Alaska

Map: the earthquake near Atka, Alaska, with plate boundaries

A magnitude 4.5 earthquake struck 111 km (69 mi) east-southeast of Atka, Alaska on Saturday, October 31, 2026 at 18:51 UTC, at a depth of 45 km (28 mi), according to the U.S. Geological Survey. Shallow quakes like this one shake the surface hardest.

MagnitudeM4.5
Depth45 km (28 mi)
Time (UTC)Oct 31 18:51
Location51.70°N 172.79°W
Nearest townAtka · 111 km
Energy85 tons TNT
Tsunami flagNo
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Why here?

This earthquake struck about 92 km (57 mi) from the boundary between the North American and Pacific 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 4.5 released roughly the energy of 85 tons of TNT. That is about 5.6 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 32,000,000 times more than this one.

Earthquake history here

Before this earthquake, USGS had recorded 156 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 31, 2026 or earthquakes by day.

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