Tonga earthquakes

M4.5 earthquake 68 km N of Hihifo, Tonga

A magnitude 4.5 earthquake struck 68 km N of Hihifo, Tonga on Sat, Aug 21, 2021, 8:18 PM GMT+13 (07:18 UTC), 133 km (82 mi) below the surface.

A larger quake followed: M5.8 135 km SW of Gataivai, Samoa. 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
4.5 (mb), light
Local time
UTC
2021-08-21 07:18:30 UTC
Depth
132.8 km (82.5 mi), intermediate-depth
Epicenter
15.350° S, 173.673° 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 10.4 km horizontally, 8.1 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
64°
Stations used
30

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 10 in the 30 days before it.

After

  1. 4.6Tonga · 1863 days ago · 69 km deep · 94 km away
  2. 4.9108 km NE of Hihifo, Tonga · 1859 days ago · 10 km deep · 67 km away
  3. 4.535 km N of Hihifo, Tonga · 1856 days ago · 83 km deep · 35 km away
  4. 4.692 km NNE of Hihifo, Tonga · 1851 days ago · 10 km deep · 24 km away
  5. 4.566 km E of Hihifo, Tonga · 1850 days ago · 35 km deep · 78 km away
  6. 4.7106 km NE of Hihifo, Tonga · 1849 days ago · 10 km deep · 69 km away
  7. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 75 km away
  8. 5.279 km NW of Hihifo, Tonga · 1844 days ago · 187 km deep · 68 km away
  9. 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 42 km away
  10. 4.995 km N of Hihifo, Tonga · 1842 days ago · 110 km deep · 38 km away · felt by 1
  11. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 47 km away · felt by 3
  12. 4.3105 km NNE of Hihifo, Tonga · 1833 days ago · 149 km deep · 44 km away
  13. 4.371 km NE of Hihifo, Tonga · 1830 days ago · 35 km deep · 49 km away
  14. 4.6136 km NNE of Hihifo, Tonga · 1824 days ago · 10 km deep · 78 km away
  15. 5.8135 km SW of Gataivai, Samoa · 1824 days ago · 20 km deep · 92 km away · felt by 3
  16. 4.4129 km SW of Gataivai, Samoa · 1824 days ago · 10 km deep · 93 km away
  17. 5.481 km NE of Hihifo, Tonga · 1820 days ago · 35 km deep · 44 km away · felt by 4
  18. 4.331 km ESE of Hihifo, Tonga · 1810 days ago · 107 km deep · 83 km away

Before

  1. 4.545 km N of Hihifo, Tonga · 1867 days ago · 67 km deep · 24 km away
  2. 4.953 km NE of Hihifo, Tonga · 1878 days ago · 78 km deep · 34 km away
  3. 4.898 km NE of Hihifo, Tonga · 1880 days ago · 10 km deep · 48 km away
  4. 4.6105 km NNE of Hihifo, Tonga · 1886 days ago · 10 km deep · 40 km away
  5. 4.881 km NE of Hihifo, Tonga · 1890 days ago · 32 km deep · 49 km away · felt by 7
  6. 4.875 km NW of Hihifo, Tonga · 1892 days ago · 175 km deep · 79 km away
  7. 4.896 km N of Hihifo, Tonga · 1892 days ago · 93 km deep · 37 km away
  8. 5.085 km N of Hihifo, Tonga · 1893 days ago · 10 km deep · 25 km away
  9. 4.620 km WSW of Hihifo, Tonga · 1893 days ago · 113 km deep · 80 km away
  10. 4.570 km N of Hihifo, Tonga · 1894 days ago · 74 km deep · 27 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f999. Read Wed, Sep 30, 2026, 4:48 AM UTC.