M4.0 earthquake 179 km SW of Hihifo, Tonga
A magnitude 4.0 earthquake struck 179 km SW of Hihifo, Tonga on Fri, Sep 21, 2018, 8:28 AM GMT-12 (20:28 UTC), 267 km (166 mi) below the surface.
A larger quake followed: M5.4 86 km SW 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
- 2018-09-21 20:28:49 UTC
- Depth
- 267.0 km (165.9 mi), intermediate-depth
- Epicenter
- 17.068° S, 175.021° 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 6.6 km horizontally, 15.0 km in depth
- Magnitude uncertainty
- ±0.18
- Depth from
- From location
- Station coverage gap
- 142°
- Stations used
- 14
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.6104 km SSW of Hihifo, Tonga · 2932 days ago · 10 km deep · 84 km away
- 4.3147 km NNW of Neiafu, Tonga · 2927 days ago · 146 km deep · 85 km away
- 4.8121 km SSW of Hihifo, Tonga · 2926 days ago · 10 km deep · 89 km away
- 4.2182 km NW of Neiafu, Tonga · 2925 days ago · 206 km deep · 39 km away
- 4.3150 km WSW of Hihifo, Tonga · 2919 days ago · 332 km deep · 76 km away
- 4.2232 km WSW of Hihifo, Tonga · 2917 days ago · 296 km deep · 74 km away
- 4.0201 km WSW of Hihifo, Tonga · 2913 days ago · 332 km deep · 53 km away
- 5.486 km SW of Hihifo, Tonga · 2899 days ago · 200 km deep · 95 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000h3ct. Read Sat, Oct 3, 2026, 2:37 AM UTC.