M3.9 earthquake 81 km WSW of Pangai, Tonga
A magnitude 3.9 earthquake struck 81 km WSW of Pangai, Tonga on Tue, Oct 23, 1973, 5:01 PM GMT+13 (04:01 UTC), 90 km (56 mi) below the surface.
A larger quake followed: M4.9 86 km S 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
- 3.9 (mb), minor
- Local time
- UTC
- 1973-10-23 04:01:46 UTC
- Depth
- 90.0 km (55.9 mi), intermediate-depth
- Epicenter
- 20.161° S, 175.041° 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: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00003wh. Read Tue, Sep 29, 2026, 8:57 PM UTC.