M4.1 earthquake 168 km NNW of Neiafu, Tonga
A magnitude 4.1 earthquake struck 168 km NNW of Neiafu, Tonga on Thu, Oct 21, 2021, 9:12 AM GMT-12 (21:12 UTC), 308 km (192 mi) below the surface.
A larger quake followed: M5.0 121 km S 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
- 4.1 (mb), light
- Local time
- UTC
- 2021-10-21 21:12:44 UTC
- Depth
- 308.3 km (191.5 mi), deep
- Epicenter
- 17.340° S, 174.796° 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 8.9 km horizontally, 8.2 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 85°
- Stations used
- 29
Nearby
Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 6 in the 30 days before it.
After
- 5.0121 km S of Hihifo, Tonga · 1803 days ago · 75 km deep · 94 km away
- 4.6125 km NNW of Neiafu, Tonga · 1794 days ago · 176 km deep · 44 km away
- 4.2144 km NW of Neiafu, Tonga · 1792 days ago · 262 km deep · 30 km away
- 4.4131 km SSW of Hihifo, Tonga · 1789 days ago · 219 km deep · 59 km away
- 4.285 km NNW of Neiafu, Tonga · 1787 days ago · 67 km deep · 85 km away
- 4.6138 km NW of Neiafu, Tonga · 1780 days ago · 227 km deep · 41 km away
- 4.4137 km N of Neiafu, Tonga · 1780 days ago · 76 km deep · 90 km away
- 4.2123 km WSW of Hihifo, Tonga · 1773 days ago · 204 km deep · 99 km away
- 4.0112 km SW of Hihifo, Tonga · 1769 days ago · 190 km deep · 79 km away
- 4.5103 km NNW of Neiafu, Tonga · 1760 days ago · 80 km deep · 68 km away
- 4.6120 km SSW of Hihifo, Tonga · 1752 days ago · 89 km deep · 78 km away
Before
- 4.488 km NW of Neiafu, Tonga · 1809 days ago · 131 km deep · 86 km away
- 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 85 km away
- 4.5162 km SW of Hihifo, Tonga · 1815 days ago · 197 km deep · 24 km away
- 4.3188 km NW of Neiafu, Tonga · 1816 days ago · 291 km deep · 42 km away
- 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 88 km away
- 4.8117 km N of Neiafu, Tonga · 1821 days ago · 98 km deep · 81 km away
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fp8g. Read Wed, Sep 30, 2026, 6:16 AM UTC.