M4.2 earthquake 147 km W of Pangai, Tonga
A magnitude 4.2 earthquake struck 147 km W of Pangai, Tonga on Fri, Aug 4, 2017, 2:08 AM GMT+13 (13:08 UTC), 279 km (173 mi) below the surface.
A larger quake followed: M4.4 114 km NW of Nuku‘alofa, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2017-08-03 13:08:32 UTC
- Depth
- 278.7 km (173.2 mi), intermediate-depth
- Epicenter
- 19.849° S, 175.765° 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 15.2 km horizontally, 14.5 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 105°
- Stations used
- 37
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.3216 km NW of Nuku‘alofa, Tonga · 3345 days ago · 303 km deep · 88 km away
- 4.4114 km NW of Nuku‘alofa, Tonga · 3331 days ago · 227 km deep · 57 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000a6a9. Read Thu, Oct 1, 2026, 7:19 AM UTC.