M4.7 earthquake 131 km E of Hihifo, Tonga
A magnitude 4.7 earthquake struck 131 km E of Hihifo, Tonga on Sat, Sep 28, 1985, 10:17 AM GMT-11 (21:17 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.4 56 km ESE 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
- 4.7 (mb), light
- Local time
- UTC
- 1985-09-28 21:17:51 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 15.955° S, 172.566° 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 1.7 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.767 km ENE of Hihifo, Tonga · 14971 days ago · 33 km deep · 78 km away
- 5.456 km ESE of Hihifo, Tonga · 14932 days ago · 33 km deep · 85 km away
- 4.678 km ESE of Hihifo, Tonga · 14931 days ago · 50 km deep · 58 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002k8d. Read Thu, Sep 24, 2026, 10:39 AM UTC.