Tonga earthquakes

M5.4 earthquake 59 km E of ‘Ohonua, Tonga

A magnitude 5.4 earthquake struck 59 km E of ‘Ohonua, Tonga on Sat, May 27, 2006, 11:35 AM GMT+13 (22:35 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.6 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: 5.4 (Mwc, centroid moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, May 27, 2006, 11:35 AM GMT+13
UTC: 2006-05-26 22:35:06 UTC
Depth: 33.1 km (20.6 mi), shallow
Epicenter: 21.250° S, 174.388° 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
5.4	Mwc, centroid moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.38	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.4	Mwc, centroid moment	Global CMT project	Preliminary

What happened

The USGS’s account of the effects of this earthquake.

no people dead or missing; no people injured; no buildings damaged or destroyed

From the USGS event page for usp000ej1b. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Nodal plane 1: Strike 175°, dip 24°, rake 72°
Nodal plane 2: Strike 15°, dip 68°, rake 98°

How well it is located

Reviewed by a seismologist.

Station coverage gap: 53°
Stations used: 190

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast85 kmE

Nearby

Within 100 km, magnitude 2.4 and up: 22 in the 60 days after this one and 74 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 usp000ej1b (also filed as gcmtc200605262235a, gcmt20060526223506, iscgem8358514). Read Sun, Oct 4, 2026, 7:06 PM UTC.