EARTHQUAKEM4.5

M4.5 earthquake in the Kuril Islands

Map: the earthquake in the Kuril Islands, with plate boundaries

A magnitude 4.5 earthquake struck in the Kuril Islands on Monday, October 19, 2026 at 21:43 UTC, at a depth of 102 km (63 mi), according to the U.S. Geological Survey. At this intermediate depth, shaking spreads out before it reaches the surface. The epicenter was about 305 km (189 mi) southwest of Severo Kurilsk, Russia. The nearest city of a million or more people is Sapporo, Japan, about 1,124 km (699 mi) away.

MagnitudeM4.5
Depth102 km (63 mi)
Time (UTC)Oct 19 21:43
Location48.45°N 153.65°E
Nearest townSevero Kurilsk · 305 km
Energy85 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 172 km (107 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. At 102 km down, it most likely broke inside a plate that is sinking into the mantle beneath its neighbor, in what geologists call a subduction zone.

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.

Aftershocks

In the first 6 days after it, USGS recorded no smaller earthquakes of magnitude 2.5 or more within 100 km (62 mi).

A stronger magnitude 4.8 followed on October 22 at 21:09 UTC, about 94 km (59 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 171 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 19, 2026 or earthquakes by day.

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