Tonga earthquakes

M4.4 earthquake 121 km WSW of Hihifo, Tonga

A magnitude 4.4 earthquake struck 121 km WSW of Hihifo, Tonga on Mon, Aug 2, 2021, 7:39 AM GMT-12 (19:39 UTC), 273 km (169 mi) below the surface.

A larger quake followed: M4.6 Tonga. This one was a foreshock.

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The earthquake

Magnitude
4.4 (mb), light
Local time
UTC
2021-08-02 19:39:15 UTC
Depth
272.6 km (169.4 mi), intermediate-depth
Epicenter
16.340° S, 174.861° 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 10.4 km horizontally, 6.3 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
124°
Stations used
77

Nearby

Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 75 km away
  2. 4.6Tonga · 1863 days ago · 69 km deep · 96 km away
  3. 4.486 km WSW of Hihifo, Tonga · 1839 days ago · 190 km deep · 35 km away
  4. 4.4141 km W of Hihifo, Tonga · 1837 days ago · 222 km deep · 30 km away
  5. 4.6161 km W of Hihifo, Tonga · 1835 days ago · 321 km deep · 69 km away

Before

  1. 4.3185 km SW of Hihifo, Tonga · 1886 days ago · 245 km deep · 98 km away
  2. 4.3150 km W of Hihifo, Tonga · 1904 days ago · 128 km deep · 50 km away
  3. 4.4163 km WSW of Hihifo, Tonga · 1905 days ago · 10 km deep · 44 km away
  4. 4.1177 km WSW of Hihifo, Tonga · 1910 days ago · 271 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f1li. Read Wed, Sep 30, 2026, 4:02 AM UTC.