M4.5 earthquake 287 km W of Neiafu, Tonga
A magnitude 4.5 earthquake struck 287 km W of Neiafu, Tonga on Wed, Oct 22, 1975, 4:31 AM GMT+13 (15:31 UTC), 141 km (88 mi) below the surface.
A larger quake followed: M5.0 266 km WNW of Neiafu, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb), light
- Local time
- UTC
- 1975-10-21 15:31:11 UTC
- Depth
- 141.0 km (87.6 mi), intermediate-depth
- Epicenter
- 18.164° S, 176.657° 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
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000d7k. Read Tue, Sep 22, 2026, 7:27 AM UTC.