Tonga earthquakes

M5.8 earthquake 254 km SSW of ‘Ohonua, Tonga

A magnitude 5.8 earthquake struck 254 km SSW of ‘Ohonua, Tonga on Fri, Jun 16, 2023, 11:45 PM GMT+13 (10:45 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M6.2 254 km SSW of ‘Ohonua, 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.

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The earthquake

Magnitude: 5.8 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Jun 16, 2023, 11:45 PM GMT+13
UTC: 2023-06-16 10:45:25 UTC
Depth: 20.0 km (12.4 mi), shallow
Epicenter: 23.560° S, 175.602° 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
5.8	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.068 · 21 stations
5.9	Mi	NOAA Pacific Tsunami Warning Center	First automatic solution · Reviewed · 19 stations
5.7	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Preliminary

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: 5.8 Mww
Nodal plane 1: Strike 204°, dip 35°, rake 99°
Nodal plane 2: Strike 13°, dip 55°, rake 84°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.5 km horizontally, 1.1 km in depth
Magnitude uncertainty: ±0.07
Depth from: From modeling of broad-band P waveforms
Station coverage gap: 81°
Stations used: 102

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast273 kmS

Nearby

Within 100 km, magnitude 2.8 and up: 116 in the 60 days after this one and 10 in the 30 days before it.

After

The first 60 of 116.

Before

Earthquakes today Tonga earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000k8we (also filed as usauto7000k8we, pt23167001). Read Mon, Oct 5, 2026, 1:52 AM UTC.