Tonga earthquakes

M5.2 earthquake 50 km NE of ‘Ohonua, Tonga

A magnitude 5.2 earthquake struck 50 km NE of ‘Ohonua, Tonga on Mon, May 22, 2006, 4:57 PM GMT+13 (03:57 UTC), 35 km (22 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: 5.2 (Mwc, centroid moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, May 22, 2006, 4:57 PM GMT+13
UTC: 2006-05-22 03:57:47 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 21.022° S, 174.591° 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
5.2	Mwc, centroid moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.15	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.2	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 usp000ehny. 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 217°, dip 32°, rake 103°
Nodal plane 2: Strike 23°, dip 59°, rake 82°

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED
Station coverage gap: 76°
Stations used: 105

Nearest places

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

Nuku‘alofa, TongaPopulation 22,400. Forecast65 kmENE

Nearby

Within 100 km, magnitude 2.2 and up: 24 in the 60 days after this one and 80 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 usp000ehny (also filed as gcmtc200605220357a, gcmt20060522035747, iscgem8358412). Read Sun, Oct 4, 2026, 8:32 PM UTC.