M5.1 earthquake Tonga region
A magnitude 5.1 earthquake struck in the Tonga region on Mon, Oct 20, 1975, 3:28 AM GMT+13 (14:28 UTC), 43 km (27 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (mb), moderate
- Local time
- UTC
- 1975-10-19 14:28:17 UTC
- Depth
- 43.0 km (26.7 mi), shallow
- Epicenter
- 23.967° S, 175.904° 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
- CONSTRAINED_BY_DEPTH_PHASES
- Stations used
- 25
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.1 and up: 2 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.8269 km S of ‘Ohonua, Tonga · 18606 days ago · 26 km deep · 62 km away
- 4.9213 km SSW of ‘Ohonua, Tonga · 18598 days ago · 48 km deep · 95 km away
Before
- 4.6south of Tonga · 18611 days ago · 30 km deep · 75 km away
- 5.4south of Tonga · 18611 days ago · 33 km deep · 93 km away
- 5.1south of the Fiji Islands · 18613 days ago · 112 km deep · 82 km away
- 6.1south of Tonga · 18616 days ago · 33 km deep · 54 km away
- 4.6south of Tonga · 18628 days ago · 33 km deep · 87 km away
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000d6q. Read Tue, Sep 29, 2026, 12:42 PM UTC.