M4.9 earthquake 162 km NW of Neiafu, Tonga
A magnitude 4.9 earthquake struck 162 km NW of Neiafu, Tonga on Mon, Aug 10, 1987, 1:20 PM GMT+13 (00:20 UTC), 196 km (122 mi) below the surface.
A larger quake followed: M5.4 136 km WNW 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
- 4.9 (mb), light
- Local time
- UTC
- 1987-08-10 00:20:52 UTC
- Depth
- 195.7 km (121.6 mi), intermediate-depth
- Epicenter
- 17.683° S, 175.140° 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
- FROM_LOCATION
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 0 in the 30 days before it.
After
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037dc. Read Mon, Sep 28, 2026, 9:55 PM UTC.