Tonga earthquakes

M4.9 earthquake 53 km NE of Hihifo, Tonga

A magnitude 4.9 earthquake struck 53 km NE of Hihifo, Tonga on Mon, Aug 9, 2021, 12:41 PM GMT+13 (23:41 UTC), 78 km (48 mi) below the surface.

A larger quake followed: M5.4 81 km NE of Hihifo, Tonga. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
2021-08-08 23:41:19 UTC
Depth
78.0 km (48.5 mi), intermediate-depth
Epicenter
15.585° S, 173.470° 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 7.5 km horizontally, 8.0 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
86°
Stations used
34

Nearest places

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

Nearby

Within 100 km, magnitude 1.9 and up: 20 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 4.551 km SE of Hihifo, Tonga · 1878 days ago · 65 km deep · 73 km away
  2. 4.545 km N of Hihifo, Tonga · 1867 days ago · 67 km deep · 33 km away
  3. 4.568 km N of Hihifo, Tonga · 1866 days ago · 133 km deep · 34 km away
  4. 4.6Tonga · 1863 days ago · 69 km deep · 83 km away
  5. 4.9108 km NE of Hihifo, Tonga · 1859 days ago · 10 km deep · 55 km away
  6. 4.535 km N of Hihifo, Tonga · 1857 days ago · 83 km deep · 37 km away
  7. 4.692 km NNE of Hihifo, Tonga · 1852 days ago · 10 km deep · 52 km away
  8. 4.566 km E of Hihifo, Tonga · 1851 days ago · 35 km deep · 44 km away
  9. 4.7106 km NE of Hihifo, Tonga · 1849 days ago · 10 km deep · 54 km away
  10. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 59 km away
  11. 4.7124 km E of Hihifo, Tonga · 1848 days ago · 10 km deep · 92 km away
  12. 5.279 km NW of Hihifo, Tonga · 1844 days ago · 187 km deep · 91 km away
  13. 4.828 km N of Hihifo, Tonga · 1843 days ago · 59 km deep · 40 km away
  14. 4.995 km N of Hihifo, Tonga · 1842 days ago · 110 km deep · 72 km away · felt by 1
  15. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 33 km away · felt by 3
  16. 4.3105 km NNE of Hihifo, Tonga · 1833 days ago · 149 km deep · 54 km away
  17. 4.371 km NE of Hihifo, Tonga · 1830 days ago · 35 km deep · 21 km away
  18. 4.557 km SE of Hihifo, Tonga · 1829 days ago · 57 km deep · 88 km away
  19. 4.6136 km NNE of Hihifo, Tonga · 1824 days ago · 10 km deep · 84 km away
  20. 5.481 km NE of Hihifo, Tonga · 1820 days ago · 35 km deep · 28 km away · felt by 4

Before

  1. 4.898 km NE of Hihifo, Tonga · 1881 days ago · 10 km deep · 46 km away
  2. 4.6105 km NNE of Hihifo, Tonga · 1886 days ago · 10 km deep · 57 km away
  3. 4.881 km NE of Hihifo, Tonga · 1891 days ago · 32 km deep · 28 km away · felt by 7
  4. 4.875 km NW of Hihifo, Tonga · 1892 days ago · 175 km deep · 97 km away
  5. 4.896 km N of Hihifo, Tonga · 1893 days ago · 93 km deep · 71 km away
  6. 5.085 km N of Hihifo, Tonga · 1893 days ago · 10 km deep · 59 km away
  7. 4.620 km WSW of Hihifo, Tonga · 1894 days ago · 113 km deep · 72 km away
  8. 4.570 km N of Hihifo, Tonga · 1894 days ago · 74 km deep · 56 km away
  9. 4.843 km SSE of Hihifo, Tonga · 1895 days ago · 51 km deep · 87 km away
  10. 4.5108 km NE of Hihifo, Tonga · 1901 days ago · 10 km deep · 55 km away
  11. 4.753 km ENE of Hihifo, Tonga · 1907 days ago · 35 km deep · 23 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f7jc. Read Wed, Sep 30, 2026, 12:21 PM UTC.