Tonga earthquakes

M4.1 earthquake 177 km WSW of Hihifo, Tonga

A magnitude 4.1 earthquake struck 177 km WSW of Hihifo, Tonga on Wed, Jul 7, 2021, 2:06 PM GMT-12 (02:06 UTC), 271 km (168 mi) below the surface.

A larger quake followed: M4.5 187 km NW of Neiafu, Tonga. This one was a foreshock.

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The earthquake

Magnitude
4.1 (mb), light
Local time
UTC
2021-07-08 02:06:38 UTC
Depth
270.9 km (168.3 mi), intermediate-depth
Epicenter
16.584° S, 175.328° 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 14.3 km horizontally, 8.7 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
168°
Stations used
16

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 4.4163 km WSW of Hihifo, Tonga · 1905 days ago · 10 km deep · 28 km away
  2. 4.3150 km W of Hihifo, Tonga · 1905 days ago · 128 km deep · 62 km away
  3. 4.5187 km NW of Neiafu, Tonga · 1896 days ago · 261 km deep · 85 km away
  4. 4.3185 km SW of Hihifo, Tonga · 1886 days ago · 245 km deep · 82 km away
  5. 4.4121 km WSW of Hihifo, Tonga · 1885 days ago · 273 km deep · 57 km away
  6. 4.2230 km WSW of Hihifo, Tonga · 1866 days ago · 346 km deep · 64 km away

Before

  1. 4.1226 km W of Hihifo, Tonga · 1913 days ago · 387 km deep · 82 km away
  2. 4.4114 km W of Hihifo, Tonga · 1930 days ago · 323 km deep · 75 km away
  3. 4.3Tonga · 1936 days ago · 371 km deep · 67 km away
  4. 4.3208 km WSW of Hihifo, Tonga · 1938 days ago · 173 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ellf. Read Wed, Sep 30, 2026, 9:38 AM UTC.