EARTHQUAKEM4.7

M4.7 earthquake near Shizunai-furukawachō, Japan

Map: the earthquake near Shizunai-furukawachō, Japan, with plate boundaries

A magnitude 4.7 earthquake struck 33 km (21 mi) northeast of Shizunai-furukawachō, Japan on Wednesday, October 21, 2026 at 14:40 UTC, at a depth of 94 km (58 mi), according to the U.S. Geological Survey. At this intermediate depth, shaking spreads out before it reaches the surface. The nearest city of a million or more people is Sapporo, Japan, about 119 km (74 mi) away.

MagnitudeM4.7
Depth94 km (58 mi)
Time (UTC)Oct 21 14:40
Location42.57°N 142.62°E
Nearest townShizunai-furukawachō · 33 km
Energy169 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 247 km (153 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 94 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 4.7 released roughly the energy of 169 tons of TNT. That is about 11 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 16,000,000 times more than this one.

Aftershocks

In the first 5 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 244 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 21, 2026 or earthquakes by day.

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