M4.9 earthquake 154 km SW of Haveluloto, Tonga
A magnitude 4.9 earthquake struck 154 km SW of Haveluloto, Tonga on Sat, Jul 16, 1977, 12:46 PM GMT+13 (23:46 UTC), 54 km (34 mi) below the surface.
A larger quake followed: M5.1 141 km SW of Vaini, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.9 (mb), light
- Local time
- UTC
- 1977-07-15 23:46:40 UTC
- Depth
- 54.0 km (33.6 mi), shallow
- Epicenter
- 22.060° S, 176.350° 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.
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 4 in the 60 days after this one and 6 in the 30 days before it.
After
- 4.9137 km WSW of Haveluloto, Tonga · 17958 days ago · 294 km deep · 47 km away
- 5.1141 km SW of Vaini, Tonga · 17944 days ago · 122 km deep · 42 km away
- 4.5144 km SW of Vaini, Tonga · 17938 days ago · 170 km deep · 27 km away
- 4.9160 km SW of ‘Ohonua, Tonga · 17938 days ago · 33 km deep · 69 km away
Before
- 4.3199 km SW of Vaini, Tonga · 17973 days ago · 269 km deep · 45 km away
- 5.0137 km SSW of Vaini, Tonga · 17984 days ago · 33 km deep · 58 km away
- 4.7146 km SSW of ‘Ohonua, Tonga · 17985 days ago · 33 km deep · 79 km away
- 4.8200 km SW of ‘Ohonua, Tonga · 17988 days ago · 98 km deep · 90 km away
- 4.5190 km SSW of Vaini, Tonga · 17988 days ago · 138 km deep · 73 km away
- 4.6140 km SSW of Vaini, Tonga · 17988 days ago · 128 km deep · 52 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000prb. Read Tue, Sep 22, 2026, 11:00 AM UTC.