Tonga earthquakes

M4.8 earthquake 81 km NE of Hihifo, Tonga

A magnitude 4.8 earthquake struck 81 km NE of Hihifo, Tonga on Wed, Jul 28, 2021, 9:26 AM GMT+13 (20:26 UTC), 32 km (20 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
4.8 (mb), light
Local time
UTC
2021-07-27 20:26:15 UTC
Depth
32.2 km (20.0 mi), shallow
Epicenter
15.464° S, 173.235° W
Region
Tonga
Felt reports
7
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

7 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 10.0 km horizontally, 4.4 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
123°
Stations used
65

Nearest places

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

Nearby

Within 100 km, magnitude 1.8 and up: 17 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 4.6105 km NNE of Hihifo, Tonga · 1886 days ago · 10 km deep · 49 km away
  2. 4.898 km NE of Hihifo, Tonga · 1881 days ago · 10 km deep · 25 km away
  3. 4.953 km NE of Hihifo, Tonga · 1878 days ago · 78 km deep · 28 km away
  4. 4.551 km SE of Hihifo, Tonga · 1878 days ago · 65 km deep · 88 km away
  5. 4.545 km N of Hihifo, Tonga · 1867 days ago · 67 km deep · 58 km away
  6. 4.568 km N of Hihifo, Tonga · 1866 days ago · 133 km deep · 49 km away
  7. 4.9108 km NE of Hihifo, Tonga · 1859 days ago · 10 km deep · 27 km away
  8. 4.535 km N of Hihifo, Tonga · 1857 days ago · 83 km deep · 64 km away
  9. 4.692 km NNE of Hihifo, Tonga · 1852 days ago · 10 km deep · 55 km away
  10. 4.566 km E of Hihifo, Tonga · 1851 days ago · 35 km deep · 45 km away
  11. 4.7106 km NE of Hihifo, Tonga · 1849 days ago · 10 km deep · 26 km away
  12. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 85 km away
  13. 4.7124 km E of Hihifo, Tonga · 1848 days ago · 10 km deep · 75 km away
  14. 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 68 km away
  15. 4.995 km N of Hihifo, Tonga · 1842 days ago · 110 km deep · 83 km away · felt by 1
  16. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 62 km away · felt by 3
  17. 4.3105 km NNE of Hihifo, Tonga · 1833 days ago · 149 km deep · 40 km away

Before

  1. 4.896 km N of Hihifo, Tonga · 1893 days ago · 93 km deep · 81 km away
  2. 5.085 km N of Hihifo, Tonga · 1893 days ago · 10 km deep · 71 km away
  3. 4.620 km WSW of Hihifo, Tonga · 1893 days ago · 113 km deep · 100 km away
  4. 4.570 km N of Hihifo, Tonga · 1894 days ago · 74 km deep · 75 km away
  5. 4.5108 km NE of Hihifo, Tonga · 1901 days ago · 10 km deep · 31 km away
  6. 4.753 km ENE of Hihifo, Tonga · 1907 days ago · 35 km deep · 34 km away
  7. 5.075 km E of Hihifo, Tonga · 1909 days ago · 10 km deep · 60 km away
  8. 4.690 km NNE of Hihifo, Tonga · 1912 days ago · 10 km deep · 41 km away
  9. 4.7106 km N of Hihifo, Tonga · 1916 days ago · 10 km deep · 70 km away
  10. 4.417 km NNW of Hihifo, Tonga · 1918 days ago · 35 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ezm3. Read Wed, Sep 30, 2026, 9:38 AM UTC.