M4.0 earthquake 299 km WNW of Pangai, Tonga
A magnitude 4.0 earthquake struck 299 km WNW of Pangai, Tonga on Wed, Sep 1, 2021, 6:47 AM GMT+13 (17:47 UTC), 424 km (263 mi) below the surface.
A larger quake followed: M5.8 223 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
- 4.0 (mb), light
- Local time
- UTC
- 2021-08-31 17:47:44 UTC
- Depth
- 424.0 km (263.4 mi), deep
- Epicenter
- 19.044° S, 177.088° 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 15.8 km horizontally, 11.7 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- From location
- Station coverage gap
- 154°
- Stations used
- 21
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.3Fiji region · 1853 days ago · 349 km deep · 45 km away
- 4.2279 km NW of Haveluloto, Tonga · 1851 days ago · 563 km deep · 69 km away
- 5.8223 km WNW of Pangai, Tonga · 1846 days ago · 10 km deep · 76 km away · felt by 1
- 4.4291 km NW of Nuku‘alofa, Tonga · 1829 days ago · 574 km deep · 37 km away
- 4.1Fiji region · 1824 days ago · 467 km deep · 71 km away
- 4.1Fiji region · 1813 days ago · 619 km deep · 63 km away
- 4.4Fiji region · 1803 days ago · 570 km deep · 67 km away
- 4.5Fiji region · 1803 days ago · 655 km deep · 74 km away
- 5.5Fiji region · 1795 days ago · 381 km deep · 87 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000f9dn. Read Tue, Sep 29, 2026, 7:38 AM UTC.