M4.9 earthquake 125 km N of Neiafu, Tonga
A magnitude 4.9 earthquake struck 125 km N of Neiafu, Tonga on Mon, Aug 16, 2021, 7:54 PM GMT-12 (07:54 UTC), 57 km (35 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.9 (mb), light
- Local time
- UTC
- 2021-08-17 07:54:32 UTC
- Depth
- 56.5 km (35.1 mi), shallow
- Epicenter
- 17.526° S, 173.803° 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 10.6 km horizontally, 6.8 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- From location
- Station coverage gap
- 72°
- Stations used
- 40
Nearby
Within 100 km, magnitude 1.9 and up: 8 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.3138 km SSW of Hihifo, Tonga · 1867 days ago · 110 km deep · 64 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 68 km away
- 4.8174 km NE of Neiafu, Tonga · 1832 days ago · 10 km deep · 85 km away
- 4.940 km NNW of Neiafu, Tonga · 1826 days ago · 80 km deep · 98 km away
- 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 58 km away
- 4.8117 km N of Neiafu, Tonga · 1821 days ago · 98 km deep · 30 km away
- 4.3142 km N of Neiafu, Tonga · 1820 days ago · 105 km deep · 25 km away
- 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 82 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f7gj. Read Wed, Sep 30, 2026, 5:31 AM UTC.