Tonga earthquakes

M4.5 earthquake 120 km S of Hihifo, Tonga

A magnitude 4.5 earthquake struck 120 km S of Hihifo, Tonga on Mon, Oct 4, 2021, 3:46 AM GMT-12 (15:46 UTC), 63 km (39 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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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
2021-10-04 15:46:21 UTC
Depth
62.6 km (38.9 mi), shallow
Epicenter
17.034° S, 173.624° 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 9.5 km horizontally, 9.3 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
89°
Stations used
18

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.8117 km N of Neiafu, Tonga · 1821 days ago · 98 km deep · 78 km away
  2. 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 52 km away
  3. 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 59 km away
  4. 5.0121 km S of Hihifo, Tonga · 1803 days ago · 75 km deep · 37 km away
  5. 4.5148 km NE of Neiafu, Tonga · 1801 days ago · 10 km deep · 97 km away
  6. 4.1138 km NNE of Neiafu, Tonga · 1796 days ago · 35 km deep · 54 km away
  7. 4.774 km SSE of Hihifo, Tonga · 1793 days ago · 10 km deep · 48 km away
  8. 4.4131 km SSW of Hihifo, Tonga · 1789 days ago · 219 km deep · 79 km away
  9. 4.636 km SSE of Hihifo, Tonga · 1789 days ago · 73 km deep · 88 km away
  10. 4.2124 km S of Hihifo, Tonga · 1788 days ago · 35 km deep · 8 km away
  11. 4.4137 km N of Neiafu, Tonga · 1780 days ago · 76 km deep · 54 km away
  12. 4.6114 km NE of Neiafu, Tonga · 1764 days ago · 10 km deep · 99 km away

Before

  1. 4.557 km SE of Hihifo, Tonga · 1829 days ago · 57 km deep · 74 km away
  2. 4.8174 km NE of Neiafu, Tonga · 1833 days ago · 10 km deep · 74 km away
  3. 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 47 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fszj. Read Wed, Sep 30, 2026, 6:16 AM UTC.