M4.6 earthquake Tonga
A magnitude 4.6 earthquake struck in Tonga on Sun, Aug 8, 2021, 4:22 PM GMT-12 (04:22 UTC), 130 km (81 mi) below the surface.
A larger quake followed: M4.9 125 km N of Neiafu, 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), light
- Local time
- UTC
- 2021-08-09 04:22:53 UTC
- Depth
- 130.0 km (80.8 mi), intermediate-depth
- Epicenter
- 17.462° S, 174.002° 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 12.0 km horizontally, 6.2 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 69°
- Stations used
- 51
Nearby
Within 100 km, magnitude 1.6 and up: 8 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.9125 km N of Neiafu, Tonga · 1870 days ago · 57 km deep · 22 km away
- 4.3138 km SSW of Hihifo, Tonga · 1868 days ago · 110 km deep · 44 km away
- 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 96 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 55 km away
- 4.940 km NNW of Neiafu, Tonga · 1826 days ago · 80 km deep · 99 km away
- 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 62 km away
- 4.8117 km N of Neiafu, Tonga · 1822 days ago · 98 km deep · 16 km away
- 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 11 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f3id. Read Wed, Sep 30, 2026, 10:24 AM UTC.