M4.6 earthquake 66 km S of Hihifo, Tonga
A magnitude 4.6 earthquake struck 66 km S of Hihifo, Tonga on Sun, Aug 8, 2021, 3:23 PM GMT+13 (02:23 UTC), 70 km (43 mi) below the surface.
A larger quake followed: M5.1 21 km NNE 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), light
- Local time
- UTC
- 2021-08-08 02:23:55 UTC
- Depth
- 69.6 km (43.3 mi), shallow
- Epicenter
- 16.556° S, 173.765° 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 11.7 km horizontally, 9.7 km in depth
- Magnitude uncertainty
- ±0.18
- Depth from
- From location
- Station coverage gap
- 139°
- Stations used
- 14
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 13 in the 60 days after this one and 6 in the 30 days before it.
After
- 4.551 km SE of Hihifo, Tonga · 1878 days ago · 65 km deep · 52 km away
- 4.3138 km SSW of Hihifo, Tonga · 1868 days ago · 110 km deep · 82 km away
- 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 50 km away
- 4.6Tonga · 1863 days ago · 69 km deep · 52 km away
- 4.566 km E of Hihifo, Tonga · 1851 days ago · 35 km deep · 99 km away
- 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 60 km away
- 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 96 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 56 km away
- 4.486 km WSW of Hihifo, Tonga · 1839 days ago · 190 km deep · 92 km away
- 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 87 km away · felt by 3
- 4.557 km SE of Hihifo, Tonga · 1829 days ago · 57 km deep · 36 km away
- 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 55 km away
- 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 93 km away
Before
- 5.0102 km SSE of Hihifo, Tonga · 1879 days ago · 35 km deep · 50 km away
- 5.387 km SSE of Hihifo, Tonga · 1887 days ago · 10 km deep · 25 km away
- 4.579 km SE of Hihifo, Tonga · 1893 days ago · 68 km deep · 42 km away
- 4.620 km WSW of Hihifo, Tonga · 1893 days ago · 113 km deep · 66 km away
- 4.843 km SSE of Hihifo, Tonga · 1895 days ago · 51 km deep · 26 km away
- 5.075 km E of Hihifo, Tonga · 1909 days ago · 10 km deep · 96 km away
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f7ih. Read Wed, Sep 30, 2026, 9:37 AM UTC.