Tonga earthquakes

M4.1 earthquake 138 km NNE of Neiafu, Tonga

A magnitude 4.1 earthquake struck 138 km NNE of Neiafu, Tonga on Fri, Oct 29, 2021, 9:43 PM GMT-12 (09:43 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.6 124 km SSE 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
4.1 (mb), light
Local time
UTC
2021-10-30 09:43:53 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
17.501° S, 173.471° 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 12.2 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.16
Depth from
Operator assigned
Station coverage gap
155°
Stations used
14

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 4.2124 km S of Hihifo, Tonga · 1788 days ago · 35 km deep · 53 km away
  2. 4.4137 km N of Neiafu, Tonga · 1780 days ago · 76 km deep · 52 km away
  3. 4.4155 km NE of Neiafu, Tonga · 1773 days ago · 10 km deep · 77 km away
  4. 4.6114 km NE of Neiafu, Tonga · 1764 days ago · 10 km deep · 45 km away
  5. 4.5103 km NNW of Neiafu, Tonga · 1760 days ago · 80 km deep · 98 km away
  6. 4.379 km NNE of Neiafu, Tonga · 1758 days ago · 35 km deep · 61 km away
  7. 4.6120 km SSW of Hihifo, Tonga · 1752 days ago · 89 km deep · 93 km away
  8. 4.558 km N of Neiafu, Tonga · 1743 days ago · 10 km deep · 91 km away
  9. 5.6124 km SSE of Hihifo, Tonga · 1740 days ago · 43 km deep · 51 km away · felt by 5

Before

  1. 4.5148 km NE of Neiafu, Tonga · 1801 days ago · 10 km deep · 53 km away
  2. 5.0121 km S of Hihifo, Tonga · 1803 days ago · 75 km deep · 74 km away
  3. 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 55 km away
  4. 4.8117 km N of Neiafu, Tonga · 1821 days ago · 98 km deep · 65 km away
  5. 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 54 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000frez. Read Wed, Sep 30, 2026, 6:58 AM UTC.