M4.5 earthquake 122 km N of Neiafu, Tonga
A magnitude 4.5 earthquake struck 122 km N of Neiafu, Tonga on Sat, Aug 7, 2021, 5:36 AM GMT-12 (17:36 UTC), 104 km (64 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
- 4.5 (mb), light
- Local time
- UTC
- 2021-08-07 17:36:55 UTC
- Depth
- 103.5 km (64.3 mi), intermediate-depth
- Epicenter
- 17.559° S, 174.193° 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 8.8 km horizontally, 6.2 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 73°
- Stations used
- 126
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.6Tonga · 1878 days ago · 130 km deep · 23 km away
- 4.9125 km N of Neiafu, Tonga · 1870 days ago · 57 km deep · 41 km away
- 4.3138 km SSW of Hihifo, Tonga · 1868 days ago · 110 km deep · 48 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 67 km away
- 4.940 km NNW of Neiafu, Tonga · 1826 days ago · 80 km deep · 86 km away
- 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 84 km away
- 4.8117 km N of Neiafu, Tonga · 1822 days ago · 98 km deep · 13 km away
- 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 32 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f378. Read Wed, Sep 30, 2026, 11:30 AM UTC.