M4.0 earthquake 261 km W of Hihifo, Tonga
A magnitude 4.0 earthquake struck 261 km W of Hihifo, Tonga on Fri, Sep 28, 2018, 11:44 AM GMT-12 (23:44 UTC), 391 km (243 mi) below the surface.
A larger quake followed: M4.3 208 km W of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-09-28 23:44:36 UTC
- Depth
- 391.1 km (243.0 mi), deep
- Epicenter
- 16.155° S, 176.235° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 15.4 km horizontally, 19.6 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- From location
- Station coverage gap
- 165°
- Stations used
- 14
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.3208 km W of Hihifo, Tonga · 2924 days ago · 339 km deep · 54 km away
- 4.3260 km SE of Alo, Wallis and Futuna · 2899 days ago · 379 km deep · 34 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000h753. Read Fri, Oct 2, 2026, 9:43 PM UTC.