Tonga earthquakes

M4.6 earthquake 105 km NNE of Hihifo, Tonga

A magnitude 4.6 earthquake struck 105 km NNE of Hihifo, Tonga on Mon, Aug 2, 2021, 3:45 AM GMT+13 (14:45 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.1 21 km NNE 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
4.6 (mb), light
Local time
UTC
2021-08-01 14:45:59 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
15.070° S, 173.434° 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 15.0 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
124°
Stations used
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 14 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.898 km NE of Hihifo, Tonga · 1881 days ago · 10 km deep · 28 km away
  2. 4.953 km NE of Hihifo, Tonga · 1879 days ago · 78 km deep · 57 km away
  3. 4.545 km N of Hihifo, Tonga · 1867 days ago · 67 km deep · 64 km away
  4. 4.568 km N of Hihifo, Tonga · 1866 days ago · 133 km deep · 40 km away
  5. 4.9108 km NE of Hihifo, Tonga · 1859 days ago · 10 km deep · 48 km away
  6. 4.535 km N of Hihifo, Tonga · 1857 days ago · 83 km deep · 75 km away
  7. 4.692 km NNE of Hihifo, Tonga · 1852 days ago · 10 km deep · 21 km away
  8. 4.566 km E of Hihifo, Tonga · 1851 days ago · 35 km deep · 93 km away
  9. 4.7106 km NE of Hihifo, Tonga · 1849 days ago · 10 km deep · 54 km away
  10. 4.828 km N of Hihifo, Tonga · 1843 days ago · 59 km deep · 81 km away
  11. 4.995 km N of Hihifo, Tonga · 1842 days ago · 110 km deep · 50 km away · felt by 1
  12. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 84 km away · felt by 3
  13. 4.3105 km NNE of Hihifo, Tonga · 1833 days ago · 149 km deep · 11 km away
  14. 4.371 km NE of Hihifo, Tonga · 1830 days ago · 35 km deep · 57 km away

Before

  1. 4.881 km NE of Hihifo, Tonga · 1891 days ago · 32 km deep · 49 km away · felt by 7
  2. 4.896 km N of Hihifo, Tonga · 1893 days ago · 93 km deep · 48 km away
  3. 5.085 km N of Hihifo, Tonga · 1893 days ago · 10 km deep · 44 km away
  4. 4.570 km N of Hihifo, Tonga · 1894 days ago · 74 km deep · 60 km away
  5. 4.5108 km NE of Hihifo, Tonga · 1901 days ago · 10 km deep · 33 km away
  6. 4.753 km ENE of Hihifo, Tonga · 1907 days ago · 35 km deep · 76 km away
  7. 4.690 km NNE of Hihifo, Tonga · 1912 days ago · 10 km deep · 15 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f19p. Read Wed, Sep 30, 2026, 12:21 PM UTC.