M4.6 earthquake 68 km W of Neiafu, Tonga
A magnitude 4.6 earthquake struck 68 km W of Neiafu, Tonga on Mon, Aug 7, 2017, 5:47 AM GMT+13 (16:47 UTC), 128 km (80 mi) below the surface.
A larger quake followed: M5.0 152 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
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-08-06 16:47:40 UTC
- Depth
- 128.3 km (79.7 mi), intermediate-depth
- Epicenter
- 18.769° S, 174.625° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 4.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.039 · 198 stations |
| 5.06 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 8.5 km horizontally, 7.2 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- From location
- Station coverage gap
- 53°
- Stations used
- 54
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.471 km WSW of Neiafu, Tonga · 3336 days ago · 113 km deep · 6 km away
- 4.696 km WSW of Neiafu, Tonga · 3333 days ago · 66 km deep · 28 km away
- 4.490 km NW of Neiafu, Tonga · 3326 days ago · 77 km deep · 82 km away
- 4.584 km NNW of Pangai, Tonga · 3315 days ago · 100 km deep · 49 km away
- 4.431 km N of Neiafu, Tonga · 3313 days ago · 10 km deep · 77 km away
- 4.9108 km WSW of Neiafu, Tonga · 3301 days ago · 129 km deep · 42 km away
- 5.0152 km WNW of Neiafu, Tonga · 3297 days ago · 213 km deep · 94 km away
- 4.638 km NW of Neiafu, Tonga · 3292 days ago · 131 km deep · 64 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000a5d7 (also filed as iscgem616639700). Read Thu, Oct 1, 2026, 8:50 AM UTC.