M4.5 earthquake 104 km WNW of Hihifo, Tonga
A magnitude 4.5 earthquake struck 104 km WNW of Hihifo, Tonga on Fri, Sep 20, 1985, 5:12 AM GMT-11 (16:12 UTC), 300 km (186 mi) below the surface.
A larger quake followed: M4.6 95 km WNW 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
- 4.5 (mb), light
- Local time
- UTC
- 1985-09-20 16:12:24 UTC
- Depth
- 299.6 km (186.2 mi), intermediate-depth
- Epicenter
- 15.596° S, 174.703° 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.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.3120 km W of Hihifo, Tonga · 14972 days ago · 329 km deep · 59 km away
- 4.695 km WNW of Hihifo, Tonga · 14967 days ago · 33 km deep · 11 km away
- 5.175 km W of Hihifo, Tonga · 14945 days ago · 33 km deep · 38 km away
- 4.0196 km WNW of Hihifo, Tonga · 14939 days ago · 33 km deep · 93 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002jyc. Read Tue, Sep 22, 2026, 5:40 AM UTC.