Tonga earthquakes

M4.7 earthquake 174 km ESE of Hihifo, Tonga

A magnitude 4.7 earthquake struck 174 km ESE of Hihifo, Tonga on Sun, Apr 10, 1977, 11:44 AM GMT-11 (22:44 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.1 194 km SE 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
4.7 (mb), light
Local time
UTC
1977-04-10 22:44:36 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
16.616° S, 172.317° 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.

Depth from
OPERATOR_ASSIGNED
Stations used
9

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.7 and up: 7 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 4.3150 km SSE of Hihifo, Tonga · 18059 days ago · 33 km deep · 94 km away
  2. 5.1194 km SE of Hihifo, Tonga · 18057 days ago · 33 km deep · 90 km away
  3. 5.1152 km ESE of Hihifo, Tonga · 18050 days ago · 33 km deep · 22 km away
  4. 4.7126 km ESE of Hihifo, Tonga · 18049 days ago · 33 km deep · 51 km away
  5. 4.9128 km ESE of Hihifo, Tonga · 18047 days ago · 33 km deep · 53 km away
  6. 5.2221 km SE of Hihifo, Tonga · 18037 days ago · 33 km deep · 63 km away
  7. 4.4133 km ESE of Hihifo, Tonga · 18035 days ago · 62 km deep · 41 km away

Before

  1. 4.9209 km NE of Neiafu, Tonga · 18064 days ago · 35 km deep · 92 km away
  2. 4.9207 km SE of Hihifo, Tonga · 18069 days ago · 68 km deep · 77 km away
  3. 4.8226 km ESE of Hihifo, Tonga · 18070 days ago · 33 km deep · 54 km away
  4. 5.1134 km ESE of Hihifo, Tonga · 18070 days ago · 33 km deep · 40 km away
  5. 7.6199 km ESE of Hihifo, Tonga · 18071 days ago · 33 km deep · 25 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000nb8. Read Tue, Sep 22, 2026, 8:43 PM UTC.