EARTHQUAKEM4.6

M4.6 earthquake near Blitar, Indonesia

Map: the earthquake near Blitar, Indonesia, with plate boundaries

A magnitude 4.6 earthquake struck 25 km (16 mi) south-southeast of Blitar, Indonesia on Monday, October 12, 2026 at 05:28 UTC, at a depth of 121 km (75 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 Surabaya, Indonesia, about 133 km (83 mi) away.

MagnitudeM4.6
Depth121 km (75 mi)
Time (UTC)Oct 12 05:28
Location8.32°S 112.22°E
Nearest townBlitar · 25 km
Energy120 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck 121 km (75 mi) down, about 276 km (172 mi) from the nearest plate boundary on the surface. Quakes this deep happen inside old ocean plate that has sunk far into the mantle at a subduction zone, long after it dove beneath its neighbor. Their great depth spreads the shaking over a wide area but usually keeps it gentle at the surface.

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 4.6 released roughly the energy of 120 tons of TNT. That is about 7.9 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 22,000,000 times more than this one.

Aftershocks

In the first 14 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 43 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 12, 2026 or earthquakes by day.

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