Tonga earthquakes

M4.5 earthquake 57 km SE of Hihifo, Tonga

A magnitude 4.5 earthquake struck 57 km SE of Hihifo, Tonga on Tue, Sep 28, 2021, 4:40 AM GMT+13 (15:40 UTC), 57 km (36 mi) below the surface.

A larger quake followed: M5.0 121 km S 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
4.5 (mb), light
Local time
UTC
2021-09-27 15:40:32 UTC
Depth
57.5 km (35.7 mi), shallow
Epicenter
16.379° S, 173.485° 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 17.5 km horizontally, 10.2 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
146°
Stations used
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 74 km away
  2. 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 91 km away
  3. 4.331 km ESE of Hihifo, Tonga · 1810 days ago · 107 km deep · 33 km away
  4. 5.0121 km S of Hihifo, Tonga · 1803 days ago · 75 km deep · 90 km away
  5. 4.6106 km ESE of Hihifo, Tonga · 1797 days ago · 10 km deep · 74 km away
  6. 4.313 km E of Hihifo, Tonga · 1793 days ago · 71 km deep · 49 km away
  7. 4.774 km SSE of Hihifo, Tonga · 1793 days ago · 10 km deep · 28 km away
  8. 4.636 km SSE of Hihifo, Tonga · 1789 days ago · 73 km deep · 21 km away
  9. 4.2124 km S of Hihifo, Tonga · 1788 days ago · 35 km deep · 80 km away
  10. 4.875 km E of Hihifo, Tonga · 1782 days ago · 10 km deep · 65 km away

Before

  1. 4.371 km NE of Hihifo, Tonga · 1830 days ago · 35 km deep · 94 km away
  2. 5.121 km NNE of Hihifo, Tonga · 1838 days ago · 67 km deep · 72 km away · felt by 3
  3. 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 90 km away
  4. 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 84 km away
  5. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 52 km away
  6. 4.566 km E of Hihifo, Tonga · 1850 days ago · 35 km deep · 65 km away
  7. 4.535 km N of Hihifo, Tonga · 1857 days ago · 83 km deep · 90 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fqr9. Read Wed, Sep 30, 2026, 8:10 AM UTC.