M4.3 earthquake 79 km S of Pangai, Tonga
A magnitude 4.3 earthquake struck 79 km S of Pangai, Tonga on Tue, Oct 18, 1977, 12:47 AM GMT+13 (11:47 UTC), 267 km (166 mi) below the surface.
A larger quake followed: M5.5 111 km SSE of Pangai, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-10-17 11:47:36 UTC
- Depth
- 267.0 km (165.9 mi), intermediate-depth
- Epicenter
- 20.528° S, 174.405° 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
- 6
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.5111 km SSE of Pangai, Tonga · 17881 days ago · 33 km deep · 53 km away
- 5.076 km SSE of Pangai, Tonga · 17876 days ago · 33 km deep · 41 km away
- 4.856 km NNE of Kolonga, Tonga · 17868 days ago · 86 km deep · 46 km away
- 4.2114 km SE of Pangai, Tonga · 17823 days ago · 135 km deep · 73 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000r30. Read Fri, Oct 2, 2026, 5:36 PM UTC.