M4.1 earthquake 140 km NW of Nuku‘alofa, Tonga
A magnitude 4.1 earthquake struck 140 km NW of Nuku‘alofa, Tonga on Tue, Sep 7, 2021, 4:13 PM GMT+13 (03:13 UTC), 489 km (304 mi) below the surface.
A larger quake followed: M6.0 185 km WNW of Pangai, 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
- 2021-09-07 03:13:19 UTC
- Depth
- 489.2 km (303.9 mi), deep
- Epicenter
- 20.238° S, 176.145° 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 12.3 km horizontally, 13.2 km in depth
- Magnitude uncertainty
- ±0.18
- Depth from
- From location
- Station coverage gap
- 146°
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 6.0185 km WNW of Pangai, Tonga · 1848 days ago · 10 km deep · 95 km away · felt by 5
- 5.2132 km NNW of Nuku‘alofa, Tonga · 1837 days ago · 192 km deep · 46 km away
- 4.6156 km NW of Nuku‘alofa, Tonga · 1828 days ago · 10 km deep · 17 km away
- 4.2150 km WNW of Haveluloto, Tonga · 1820 days ago · 303 km deep · 63 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fb3r. Read Tue, Sep 29, 2026, 2:21 PM UTC.