Tonga earthquakes

M4.0 earthquake 277 km WNW of Haveluloto, Tonga

A magnitude 4.0 earthquake struck 277 km WNW of Haveluloto, Tonga on Thu, Oct 21, 2021, 12:09 AM GMT+13 (11:09 UTC), 533 km (331 mi) below the surface.

A larger quake followed: M5.5 Fiji region. This one was a foreshock.

Nuku‘alofa forecastMore in Tonga

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.0 (mb), light
Local time
UTC
2021-10-20 11:09:40 UTC
Depth
533.0 km (331.2 mi), deep
Epicenter
20.128° S, 177.641° 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 20.9 km horizontally, 20.0 km in depth
Magnitude uncertainty
±0.17
Depth from
From location
Station coverage gap
137°
Stations used
15

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 4.0276 km WNW of Haveluloto, Tonga · 1795 days ago · 554 km deep · 24 km away
  2. 4.2253 km WNW of Haveluloto, Tonga · 1795 days ago · 505 km deep · 39 km away
  3. 5.5Fiji region · 1795 days ago · 381 km deep · 56 km away
  4. 4.1280 km WNW of Haveluloto, Tonga · 1788 days ago · 558 km deep · 38 km away
  5. 4.2Fiji region · 1783 days ago · 425 km deep · 39 km away
  6. 4.1285 km WNW of Haveluloto, Tonga · 1782 days ago · 532 km deep · 44 km away
  7. 4.9269 km WNW of Haveluloto, Tonga · 1781 days ago · 505 km deep · 53 km away
  8. 4.1Fiji region · 1779 days ago · 559 km deep · 97 km away
  9. 4.6230 km WNW of Haveluloto, Tonga · 1777 days ago · 10 km deep · 55 km away
  10. 4.4Fiji region · 1775 days ago · 480 km deep · 46 km away
  11. 4.1Fiji region · 1773 days ago · 563 km deep · 57 km away
  12. 4.1259 km WNW of Haveluloto, Tonga · 1767 days ago · 505 km deep · 18 km away
  13. 4.1Fiji region · 1766 days ago · 570 km deep · 73 km away
  14. 4.1293 km WNW of Haveluloto, Tonga · 1764 days ago · 570 km deep · 25 km away
  15. 4.1Fiji region · 1751 days ago · 354 km deep · 60 km away
  16. 4.5286 km W of Haveluloto, Tonga · 1750 days ago · 522 km deep · 68 km away
  17. 4.4239 km WNW of Haveluloto, Tonga · 1747 days ago · 486 km deep · 45 km away
  18. 4.0288 km W of Haveluloto, Tonga · 1745 days ago · 505 km deep · 73 km away

Before

  1. 4.2Fiji region · 1806 days ago · 437 km deep · 62 km away
  2. 4.3265 km WNW of Haveluloto, Tonga · 1806 days ago · 511 km deep · 53 km away
  3. 4.5Fiji region · 1809 days ago · 395 km deep · 34 km away
  4. 4.3280 km WNW of Haveluloto, Tonga · 1815 days ago · 372 km deep · 23 km away
  5. 4.3277 km WNW of Haveluloto, Tonga · 1827 days ago · 565 km deep · 1 km away
  6. 4.4291 km NW of Nuku‘alofa, Tonga · 1828 days ago · 574 km deep · 97 km away
  7. 4.2260 km WNW of Haveluloto, Tonga · 1830 days ago · 510 km deep · 23 km away
  8. 4.4258 km WNW of Haveluloto, Tonga · 1831 days ago · 527 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fxf5. Read Mon, Sep 28, 2026, 9:10 PM UTC.