M4.9 earthquake 227 km S of ‘Ohonua, Tonga
A magnitude 4.9 earthquake struck 227 km S of ‘Ohonua, Tonga on Mon, Feb 18, 1985, 1:53 AM GMT+13 (12:53 UTC), 39 km (24 mi) below the surface.
A larger quake followed: M5.0 299 km SSW of ‘Ohonua, 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 (ms), light
- Local time
- UTC
- 1985-02-17 12:53:34 UTC
- Depth
- 39.3 km (24.4 mi), shallow
- Epicenter
- 23.379° S, 175.173° 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: 3 in the 60 days after this one and 7 in the 30 days before it.
After
- 4.9245 km S of ‘Ohonua, Tonga · 15159 days ago · 33 km deep · 22 km away
- 4.6235 km S of ‘Ohonua, Tonga · 15155 days ago · 33 km deep · 8 km away
- 5.0299 km SSW of ‘Ohonua, Tonga · 15153 days ago · 33 km deep · 80 km away
Before
- 5.5206 km S of ‘Ohonua, Tonga · 15197 days ago · 42 km deep · 22 km away
- 5.0191 km S of ‘Ohonua, Tonga · 15197 days ago · 43 km deep · 38 km away
- 4.9248 km S of ‘Ohonua, Tonga · 15198 days ago · 33 km deep · 23 km away
- 5.4213 km S of ‘Ohonua, Tonga · 15198 days ago · 42 km deep · 21 km away
- 4.3214 km SSW of ‘Ohonua, Tonga · 15199 days ago · 256 km deep · 76 km away
- 5.4259 km S of ‘Ohonua, Tonga · 15199 days ago · 33 km deep · 32 km away
- 5.4197 km SSW of ‘Ohonua, Tonga · 15204 days ago · 33 km deep · 40 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002bzc. Read Sun, Sep 27, 2026, 4:26 AM UTC.