Tonga earthquakes

M4.6 earthquake 275 km WNW of Haveluloto, Tonga

A magnitude 4.6 earthquake struck 275 km WNW of Haveluloto, Tonga on Fri, Jul 21, 2017, 8:16 PM GMT+13 (07:16 UTC), 422 km (262 mi) below the surface.

A larger quake followed: M4.7 Fiji region. This one was a foreshock.

Nuku‘alofa forecast More in Tonga

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.6 (mb), light
Local time: Fri, Jul 21, 2017, 8:16 PM GMT+13
UTC: 2017-07-21 07:16:17 UTC
Depth: 422.2 km (262.3 mi), deep
Epicenter: 20.036° S, 177.575° 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 15.4 km horizontally, 11.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 75°
Stations used: 37

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nuku‘alofa, TongaPopulation 22,400. Forecast276 kmWNW

Nearby

Within 100 km, magnitude 1.6 and up: 30 in the 60 days after this one and 14 in the 30 days before it.

After

Before

Earthquakes today Tonga earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20009yut. Read Wed, Sep 30, 2026, 4:17 PM UTC.