Tonga earthquakes

M4.4 earthquake 86 km WSW of Hihifo, Tonga

A magnitude 4.4 earthquake struck 86 km WSW of Hihifo, Tonga on Thu, Sep 16, 2021, 11:36 AM GMT-12 (23:36 UTC), 190 km (118 mi) below the surface.

A larger quake followed: M4.6 161 km W of Hihifo, Tonga. This one was a foreshock.

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The earthquake

Magnitude
4.4 (mb), light
Local time
UTC
2021-09-16 23:36:12 UTC
Depth
189.9 km (118.0 mi), intermediate-depth
Epicenter
16.222° S, 174.553° 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 9.2 km horizontally, 7.0 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
68°
Stations used
20

Nearby

Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.4141 km W of Hihifo, Tonga · 1838 days ago · 222 km deep · 58 km away
  2. 4.6161 km W of Hihifo, Tonga · 1835 days ago · 321 km deep · 88 km away
  3. 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 84 km away
  4. 4.0124 km W of Hihifo, Tonga · 1807 days ago · 258 km deep · 63 km away
  5. 4.313 km E of Hihifo, Tonga · 1793 days ago · 71 km deep · 98 km away
  6. 4.4131 km SSW of Hihifo, Tonga · 1789 days ago · 219 km deep · 89 km away
  7. 4.636 km SSE of Hihifo, Tonga · 1789 days ago · 73 km deep · 99 km away

Before

  1. 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 98 km away
  2. 4.828 km N of Hihifo, Tonga · 1842 days ago · 59 km deep · 97 km away
  3. 5.279 km NW of Hihifo, Tonga · 1844 days ago · 187 km deep · 93 km away
  4. 4.86 km S of Hihifo, Tonga · 1849 days ago · 82 km deep · 84 km away
  5. 4.6Tonga · 1863 days ago · 69 km deep · 61 km away
  6. 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fdhi. Read Wed, Sep 30, 2026, 8:12 AM UTC.