M4.7 earthquake 145 km NW of Neiafu, Tonga
A magnitude 4.7 earthquake struck 145 km NW of Neiafu, Tonga on Sun, Jul 23, 2017, 11:01 PM GMT+13 (10:01 UTC), 218 km (136 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
- 4.7 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-07-23 10:01:09 UTC
- Depth
- 218.4 km (135.7 mi), intermediate-depth
- Epicenter
- 17.702° S, 174.939° 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 7.2 km horizontally, 7.7 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 83°
- Stations used
- 40
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 4 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.396 km N of Neiafu, Tonga · 3358 days ago · 10 km deep · 84 km away
- 4.490 km NW of Neiafu, Tonga · 3327 days ago · 77 km deep · 55 km away
- 4.5148 km NW of Neiafu, Tonga · 3325 days ago · 234 km deep · 3 km away
- 5.0152 km WNW of Neiafu, Tonga · 3298 days ago · 213 km deep · 85 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us20009zzj. Read Fri, Oct 2, 2026, 9:42 AM UTC.