M4.6 earthquake 134 km NNE of Hihifo, Tonga
A magnitude 4.6 earthquake struck 134 km NNE of Hihifo, Tonga on Tue, Aug 21, 2018, 5:28 PM GMT+13 (04:28 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.1 126 km NE 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
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-08-21 04:28:16 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 14.798° S, 173.403° 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 5.9 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.17
- Depth from
- Operator assigned
- Station coverage gap
- 102°
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 9 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.1126 km NE of Hihifo, Tonga · 2965 days ago · 10 km deep · 46 km away
- 4.6102 km NNE of Hihifo, Tonga · 2964 days ago · 19 km deep · 32 km away
- 4.6111 km ENE of Hihifo, Tonga · 2962 days ago · 10 km deep · 86 km away
- 4.8123 km NE of Hihifo, Tonga · 2958 days ago · 10 km deep · 64 km away
- 4.9144 km NE of Hihifo, Tonga · 2948 days ago · 10 km deep · 56 km away
- 4.767 km N of Hihifo, Tonga · 2946 days ago · 82 km deep · 76 km away
- 4.3100 km NNW of Hihifo, Tonga · 2938 days ago · 153 km deep · 94 km away
- 4.397 km NE of Hihifo, Tonga · 2938 days ago · 10 km deep · 53 km away
- 4.6109 km NE of Hihifo, Tonga · 2909 days ago · 10 km deep · 63 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000geec. Read Sat, Oct 3, 2026, 12:15 AM UTC.