Tonga earthquakes

M4.6 earthquake Tonga

A magnitude 4.6 earthquake struck in Tonga on Wed, Aug 25, 2021, 2:21 AM GMT+13 (13:21 UTC), 69 km (43 mi) below the surface.

A larger quake followed: M5.2 79 km NW 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
2021-08-24 13:21:30 UTC
Depth
69.3 km (43.1 mi), shallow
Epicenter
16.140° S, 173.990° 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 9.7 km horizontally, 11.0 km in depth
Magnitude uncertainty
±0.24
Depth from
From location
Station coverage gap
157°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.6 and up: 11 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 4.535 km N of Hihifo, Tonga · 1856 days ago · 83 km deep · 59 km away
  2. 4.566 km E of Hihifo, Tonga · 1850 days ago · 35 km deep · 92 km away
  3. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 25 km away
  4. 5.279 km NW of Hihifo, Tonga · 1844 days ago · 187 km deep · 86 km away
  5. 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 52 km away
  6. 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 92 km away
  7. 4.486 km WSW of Hihifo, Tonga · 1839 days ago · 190 km deep · 61 km away
  8. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 50 km away · felt by 3
  9. 4.557 km SE of Hihifo, Tonga · 1829 days ago · 57 km deep · 60 km away
  10. 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 84 km away
  11. 4.331 km ESE of Hihifo, Tonga · 1810 days ago · 107 km deep · 50 km away

Before

  1. 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 59 km away
  2. 4.568 km N of Hihifo, Tonga · 1866 days ago · 133 km deep · 94 km away
  3. 4.545 km N of Hihifo, Tonga · 1867 days ago · 67 km deep · 71 km away
  4. 4.551 km SE of Hihifo, Tonga · 1878 days ago · 65 km deep · 63 km away
  5. 4.953 km NE of Hihifo, Tonga · 1878 days ago · 78 km deep · 83 km away
  6. 4.666 km S of Hihifo, Tonga · 1879 days ago · 70 km deep · 52 km away
  7. 5.0102 km SSE of Hihifo, Tonga · 1879 days ago · 35 km deep · 98 km away
  8. 4.4121 km WSW of Hihifo, Tonga · 1884 days ago · 273 km deep · 96 km away
  9. 5.387 km SSE of Hihifo, Tonga · 1887 days ago · 10 km deep · 77 km away
  10. 4.875 km NW of Hihifo, Tonga · 1892 days ago · 175 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f74u. Read Wed, Sep 30, 2026, 5:36 AM UTC.