Tonga earthquakes

M4.1 earthquake 168 km NNW of Neiafu, Tonga

A magnitude 4.1 earthquake struck 168 km NNW of Neiafu, Tonga on Thu, Oct 21, 2021, 9:12 AM GMT-12 (21:12 UTC), 308 km (192 mi) below the surface.

A larger quake followed: M5.0 121 km S of Hihifo, Tonga. This one was a foreshock.

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The earthquake

Magnitude
4.1 (mb), light
Local time
UTC
2021-10-21 21:12:44 UTC
Depth
308.3 km (191.5 mi), deep
Epicenter
17.340° S, 174.796° W
Region
Tonga
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 8.9 km horizontally, 8.2 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
85°
Stations used
29

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 6 in the 30 days before it.

After

Before

Earthquakes todayTonga earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fp8g. Read Wed, Sep 30, 2026, 6:16 AM UTC.