Tonga earthquakes

M4.9 earthquake Tonga

A magnitude 4.9 earthquake struck in Tonga on Tue, Aug 15, 2017, 4:37 AM GMT+13 (15:37 UTC), 10 km (6 mi) below the surface.

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: 4.9 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Aug 15, 2017, 4:37 AM GMT+13
UTC: 2017-08-14 15:37:58 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 20.652° S, 173.679° 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 · ±0.093 · 36 stations
4.96	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 9.7 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: Operator assigned
Station coverage gap: 61°
Stations used: 39

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast167 kmENE

Nearby

Within 100 km, magnitude 1.9 and up: 5 in the 60 days after this one and 10 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 us2000a81u (also filed as iscgem610896933). Read Sun, Oct 4, 2026, 9:14 AM UTC.