Tonga earthquakes

M4.9 earthquake 128 km NW of Neiafu, Tonga

A magnitude 4.9 earthquake struck 128 km NW of Neiafu, Tonga on Sat, Dec 21, 2019, 5:17 PM GMT+13 (04:17 UTC), 155 km (96 mi) below the surface.

Nuku‘alofa forecast More in Tonga

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

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The earthquake

Magnitude: 4.9 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Dec 21, 2019, 5:17 PM GMT+13
UTC: 2019-12-21 04:17:58 UTC
Depth: 154.6 km (96.1 mi), intermediate-depth
Epicenter: 17.697° S, 174.674° W
Region: Tonga
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.03 · 335 stations
5.07	Mw, moment	ISC-GEM global catalog	Final · ±0.1

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 9.8 km horizontally, 5.4 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 37°
Stations used: 97

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast386 kmN

Nearby

Within 100 km, magnitude 1.9 and up: 11 in the 60 days after this one and 2 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 us70006pc0 (also filed as iscgem616999214). Read Thu, Oct 1, 2026, 10:40 AM UTC.