Tonga earthquakes

M5.4 earthquake 111 km NE of Hihifo, Tonga

A magnitude 5.4 earthquake struck 111 km NE of Hihifo, Tonga on Sun, Jan 29, 2017, 12:32 PM GMT+14 (22:32 UTC), 37 km (23 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.4 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Jan 29, 2017, 12:32 PM GMT+14
UTC: 2017-01-28 22:32:56 UTC
Depth: 37.2 km (23.1 mi), shallow
Epicenter: 15.229° S, 173.076° W
Region: Tonga
Felt reports: 4
Strongest shaking: III, weak 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
5.4	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.098 · 10 stations
5.5	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.4	Mwb, body-wave moment	USGS National Earthquake Information Center	Moment tensor · Reviewed

Shaking

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

Strongest estimated: III, weak shaking
Map: Automatic

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

Did you feel it?

4 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

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

Fault motion and ground failure

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

Faulting: Strike-slip
Moment magnitude: 5.4 Mww
Nodal plane 1: Strike 162°, dip 30°, rake 154°
Nodal plane 2: Strike 275°, dip 77°, rake 63°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.6 km horizontally, 3.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 18°
Stations used: 297

Nearest places

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

Apia, SamoaPopulation 40,407. Forecast210 kmSW

Nearby

Within 100 km, magnitude 2.4 and up: 10 in the 60 days after this one and 6 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 us10007vz5 (also filed as iscgem610147559). Read Sat, Oct 3, 2026, 1:46 AM UTC.