EARTHQUAKEM4.5

M4.5 earthquake near Onagawa Chō, Japan

Map: the earthquake near Onagawa Chō, Japan, with plate boundaries

A magnitude 4.5 earthquake struck 74 km (46 mi) south-southeast of Onagawa Chō, Japan on Sunday, October 25, 2026 at 06:04 UTC, at a depth of 53 km (33 mi), according to the U.S. Geological Survey. Shallow quakes like this one shake the surface hardest.

MagnitudeM4.5
Depth53 km (33 mi)
Time (UTC)Oct 25 06:04
Location37.85°N 141.84°E
Nearest townOnagawa Chō · 74 km
Energy85 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 169 km (105 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.

Aftershocks

In the first 22 hours 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 433 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 25, 2026 or earthquakes by day.

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