M4.9 earthquake 108 km WSW of Neiafu, Tonga
A magnitude 4.9 earthquake struck 108 km WSW of Neiafu, Tonga on Mon, Sep 18, 2017, 9:29 AM GMT+13 (20:29 UTC), 129 km (80 mi) below the surface.
A larger quake followed: M6.1 156 km NW of Pangai, 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, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-09-17 20:29:07 UTC
- Depth
- 129.3 km (80.3 mi), intermediate-depth
- Epicenter
- 18.983° S, 174.950° 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.
- Location uncertainty
- About 10.9 km horizontally, 6.6 km in depth
- Magnitude uncertainty
- ±0.03
- Depth from
- From location
- Station coverage gap
- 37°
- Stations used
- 59
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 6 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.0152 km WNW of Neiafu, Tonga · 3297 days ago · 213 km deep · 86 km away
- 4.7120 km W of Neiafu, Tonga · 3282 days ago · 10 km deep · 31 km away
- 4.6170 km WNW of Pangai, Tonga · 3281 days ago · 188 km deep · 82 km away
- 6.1156 km NW of Pangai, Tonga · 3280 days ago · 10 km deep · 65 km away · felt by 1
- 4.7123 km WNW of Neiafu, Tonga · 3247 days ago · 199 km deep · 86 km away
- 4.7140 km W of Neiafu, Tonga · 3243 days ago · 242 km deep · 69 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000apkx. Read Thu, Oct 1, 2026, 6:27 AM UTC.