Tonga earthquakes

M6.1 earthquake 241 km SSW of ‘Ohonua, Tonga

A magnitude 6.1 earthquake struck 241 km SSW of ‘Ohonua, Tonga on Sun, Jun 18, 2023, 12:26 AM GMT+13 (11:26 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M6.2 south of Tonga. 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.

Open the live map with earthquakes

The earthquake

Magnitude: 6.1 (Mww, W-phase moment), strong
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Jun 18, 2023, 12:26 AM GMT+13
UTC: 2023-06-17 11:26:20 UTC
Depth: 22.0 km (13.7 mi), shallow
Epicenter: 23.465° S, 175.472° W
Region: Tonga
Strongest shaking: I, not felt shaking
PAGER alert: Green
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
6.1	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.049 · 40 stations
6.4	Mi	NOAA Pacific Tsunami Warning Center	First automatic solution · Reviewed · 13 stations
6.0	Mwb, body-wave moment	USGS National Earthquake Information Center	Moment tensor · Reviewed
6.0	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Confirmed

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 6.1 Mww
Nodal plane 1: Strike 210°, dip 38°, rake 93°
Nodal plane 2: Strike 27°, dip 52°, rake 88°
Landslide alert: Green
Liquefaction alert: Green

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.6 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From modeling of broad-band P waveforms
Station coverage gap: 60°
Stations used: 54

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast260 kmS

Nearby

Within 100 km, magnitude 3.1 and up: 97 in the 60 days after this one and 26 in the 30 days before it.

After

The first 60 of 97.

Before

Earthquakes today Tonga earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000k96l (also filed as usauto7000k96l, pt23168000). Read Mon, Oct 5, 2026, 8:11 AM UTC.