EARTHQUAKEM4.6

M4.6 earthquake near Port Blair, India

Map: the earthquake near Port Blair, India, with plate boundaries

A magnitude 4.6 earthquake struck 170 km (106 mi) south-southeast of Port Blair, India on Monday, October 12, 2026 at 15:37 UTC, at a depth of 91 km (57 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 Rangoon, Myanmar, about 808 km (502 mi) away.

MagnitudeM4.6
Depth91 km (57 mi)
Time (UTC)Oct 12 15:37
Location10.16°N 93.08°E
Nearest townPort Blair · 170 km
Energy120 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
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Why here?

This earthquake struck about 142 km (88 mi) from the boundary between the Indian and Sunda 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 91 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 4.6 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 42 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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