M4.6 earthquake 54 km ESE of Pangai, Tonga
A magnitude 4.6 earthquake struck 54 km ESE of Pangai, Tonga on Fri, Aug 1, 1986, 2:30 AM GMT+13 (13:30 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M6.2 76 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
- 4.6 (mb), light
- Local time
- UTC
- 1986-07-31 13:30:43 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 19.936° S, 173.853° 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
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 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 usp0002wrn. Read Tue, Sep 22, 2026, 7:01 AM UTC.