Tonga earthquakes

M4.0 earthquake 276 km WNW of Haveluloto, Tonga

A magnitude 4.0 earthquake struck 276 km WNW of Haveluloto, Tonga on Sun, Aug 22, 2021, 4:26 PM GMT+13 (03:26 UTC), 540 km (336 mi) below the surface.

A larger quake followed: M4.5 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
2021-08-22 03:26:45 UTC
Depth
540.3 km (335.7 mi), deep
Epicenter
20.375° S, 177.741° 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 17.7 km horizontally, 9.2 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
168°
Stations used
24

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 8 in the 30 days before it.

After

  1. 4.2257 km WNW of Haveluloto, Tonga · 1859 days ago · 401 km deep · 29 km away
  2. 4.4Fiji region · 1858 days ago · 550 km deep · 63 km away
  3. 4.1Fiji region · 1854 days ago · 550 km deep · 44 km away
  4. 4.2279 km NW of Haveluloto, Tonga · 1850 days ago · 563 km deep · 94 km away
  5. 4.1264 km WNW of Haveluloto, Tonga · 1846 days ago · 563 km deep · 53 km away
  6. 4.1Fiji region · 1845 days ago · 558 km deep · 59 km away
  7. 4.3Fiji region · 1845 days ago · 577 km deep · 80 km away
  8. 4.1205 km WNW of Haveluloto, Tonga · 1845 days ago · 314 km deep · 76 km away
  9. 4.2Fiji region · 1840 days ago · 595 km deep · 92 km away
  10. 4.3Fiji region · 1838 days ago · 601 km deep · 87 km away
  11. 4.2257 km WNW of Haveluloto, Tonga · 1836 days ago · 500 km deep · 50 km away
  12. 4.3Fiji region · 1835 days ago · 603 km deep · 80 km away
  13. 4.4258 km WNW of Haveluloto, Tonga · 1831 days ago · 527 km deep · 23 km away
  14. 4.2260 km WNW of Haveluloto, Tonga · 1830 days ago · 510 km deep · 20 km away
  15. 4.3277 km WNW of Haveluloto, Tonga · 1827 days ago · 565 km deep · 30 km away
  16. 4.3280 km WNW of Haveluloto, Tonga · 1815 days ago · 372 km deep · 53 km away
  17. 4.5Fiji region · 1809 days ago · 395 km deep · 60 km away
  18. 4.3265 km WNW of Haveluloto, Tonga · 1806 days ago · 511 km deep · 26 km away
  19. 4.2Fiji region · 1806 days ago · 437 km deep · 77 km away
  20. 4.0277 km WNW of Haveluloto, Tonga · 1804 days ago · 533 km deep · 29 km away

Before

  1. 4.1296 km W of Haveluloto, Tonga · 1866 days ago · 470 km deep · 92 km away
  2. 4.2246 km W of Haveluloto, Tonga · 1869 days ago · 518 km deep · 83 km away
  3. 4.2276 km WNW of Haveluloto, Tonga · 1870 days ago · 594 km deep · 22 km away
  4. 4.2Fiji region · 1876 days ago · 602 km deep · 92 km away
  5. 4.2Fiji region · 1880 days ago · 550 km deep · 63 km away
  6. 4.8Fiji region · 1882 days ago · 530 km deep · 50 km away
  7. 4.2277 km WNW of Haveluloto, Tonga · 1883 days ago · 534 km deep · 34 km away
  8. 4.4238 km WNW of Haveluloto, Tonga · 1887 days ago · 478 km deep · 39 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f6rr. Read Mon, Sep 28, 2026, 8:20 PM UTC.