EARTHQUAKEM4.7

M4.7 earthquake near Encounter Bay, Australia

Map: the earthquake near Encounter Bay, Australia, with plate boundaries

A magnitude 4.7 earthquake struck 98 km (61 mi) south of Encounter Bay, Australia on Monday, October 26, 2026 at 21:18 UTC, at a depth of 10 km (6 mi), according to the U.S. Geological Survey. Shallow quakes like this one shake the surface hardest. The nearest city of a million or more people is Adelaide, Australia, about 170 km (106 mi) away.

18 people reported feeling it to USGS “Did You Feel It?”.

MagnitudeM4.7
Depth10 km (6 mi)
Time (UTC)Oct 26 21:18
Location36.46°S 138.53°E
Nearest townEncounter Bay · 98 km
Energy169 tons TNT
Aftershocks M2.5+0
Tsunami flagNo
Felt reports18
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Why here?

This earthquake struck about 1,529 km (950 mi) from the nearest major plate boundary, which makes it an intraplate earthquake. These happen on old faults inside a plate, where stress from the plate’s slow movement is released. They are less common, but can surprise areas that rarely feel quakes.

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 2 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

USGS has no record of a magnitude 6 or larger earthquake within 300 km (186 mi) of here since 1900, which makes this a relatively quiet area for large quakes.

Official details, updates and the shaking map: USGS event page.

See every earthquake on October 26, 2026 or earthquakes by day.

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