Tonga earthquakes

M4.3 earthquake 86 km SSW of Hihifo, Tonga

A magnitude 4.3 earthquake struck 86 km SSW of Hihifo, Tonga on Sat, Aug 21, 2021, 12:41 PM GMT-12 (00:41 UTC), 70 km (44 mi) below the surface.

A larger quake followed: M4.8 6 km S of Hihifo, Tonga. This one was a foreshock.

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

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The earthquake

Magnitude
4.3 (mb), light
Local time
UTC
2021-08-22 00:41:51 UTC
Depth
70.1 km (43.6 mi), intermediate-depth
Epicenter
16.622° S, 174.224° 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 12.8 km horizontally, 6.7 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
142°
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 10 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 · 59 km away
  2. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 82 km away
  3. 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 42 km away
  4. 4.486 km WSW of Hihifo, Tonga · 1839 days ago · 190 km deep · 57 km away
  5. 4.557 km SE of Hihifo, Tonga · 1829 days ago · 57 km deep · 83 km away
  6. 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 79 km away
  7. 4.3142 km N of Neiafu, Tonga · 1820 days ago · 105 km deep · 87 km away
  8. 4.5162 km SW of Hihifo, Tonga · 1815 days ago · 197 km deep · 76 km away
  9. 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 29 km away
  10. 4.331 km ESE of Hihifo, Tonga · 1810 days ago · 107 km deep · 95 km away

Before

  1. 4.3138 km SSW of Hihifo, Tonga · 1867 days ago · 110 km deep · 57 km away
  2. 4.551 km SE of Hihifo, Tonga · 1878 days ago · 65 km deep · 97 km away
  3. 4.6Tonga · 1878 days ago · 130 km deep · 96 km away
  4. 4.666 km S of Hihifo, Tonga · 1879 days ago · 70 km deep · 50 km away
  5. 5.0102 km SSE of Hihifo, Tonga · 1879 days ago · 35 km deep · 95 km away
  6. 4.4121 km WSW of Hihifo, Tonga · 1884 days ago · 273 km deep · 75 km away
  7. 5.387 km SSE of Hihifo, Tonga · 1887 days ago · 10 km deep · 65 km away
  8. 4.579 km SE of Hihifo, Tonga · 1893 days ago · 68 km deep · 91 km away
  9. 4.620 km WSW of Hihifo, Tonga · 1893 days ago · 113 km deep · 74 km away
  10. 4.843 km SSE of Hihifo, Tonga · 1895 days ago · 51 km deep · 65 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f6rl. Read Wed, Sep 30, 2026, 5:31 AM UTC.