M4.9 earthquake 110 km SSE of Hihifo, Tonga
A magnitude 4.9 earthquake struck 110 km SSE of Hihifo, Tonga on Thu, Aug 29, 1985, 11:22 PM GMT-11 (10:22 UTC), 93 km (58 mi) below the surface.
A larger quake followed: M5.9 90 km S of Hihifo, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.9 (mb), light
- Local time
- UTC
- 1985-08-30 10:22:57 UTC
- Depth
- 92.6 km (57.5 mi), intermediate-depth
- Epicenter
- 16.932° S, 173.585° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 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 usp0002j93. Read Tue, Sep 22, 2026, 4:39 AM UTC.