M4.6 earthquake 133 km E of Neiafu, Tonga
A magnitude 4.6 earthquake struck 133 km E of Neiafu, Tonga on Mon, Jul 28, 1986, 7:09 AM GMT+13 (18:09 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 126 km ENE of Neiafu, 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 (ms), light
- Local time
- UTC
- 1986-07-27 18:09:21 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 18.455° S, 172.732° 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: 3 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.9126 km ENE of Neiafu, Tonga · 14674 days ago · 33 km deep · 39 km away
- 4.894 km ESE of Neiafu, Tonga · 14618 days ago · 33 km deep · 57 km away
- 4.793 km ESE of Neiafu, Tonga · 14616 days ago · 33 km deep · 61 km away
Before
- 4.2145 km E of Neiafu, Tonga · 14674 days ago · 33 km deep · 48 km away
- 5.0130 km ENE of Neiafu, Tonga · 14675 days ago · 33 km deep · 21 km away
- 5.0143 km E of Neiafu, Tonga · 14675 days ago · 33 km deep · 29 km away
- 5.1104 km NE of Neiafu, Tonga · 14675 days ago · 33 km deep · 66 km away
- 4.6111 km E of Neiafu, Tonga · 14704 days ago · 33 km deep · 44 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002wkr. Read Tue, Sep 29, 2026, 11:56 PM UTC.