M4.2 earthquake 111 km S of Hihifo, Tonga
A magnitude 4.2 earthquake struck 111 km S of Hihifo, Tonga on Thu, Aug 9, 2018, 5:37 AM GMT-12 (17:37 UTC), 135 km (84 mi) below the surface.
A larger quake followed: M4.8 121 km SSW of Hihifo, 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
- 2018-08-09 17:37:43 UTC
- Depth
- 134.7 km (83.7 mi), intermediate-depth
- Epicenter
- 16.953° S, 173.919° 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 11.7 km horizontally, 13.3 km in depth
- Magnitude uncertainty
- ±0.24
- Depth from
- From location
- Station coverage gap
- 132°
- Stations used
- 11
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.591 km S of Hihifo, Tonga · 2947 days ago · 95 km deep · 34 km away
- 4.6104 km SSW of Hihifo, Tonga · 2931 days ago · 10 km deep · 44 km away
- 4.578 km S of Hihifo, Tonga · 2930 days ago · 108 km deep · 37 km away
- 4.3147 km NNW of Neiafu, Tonga · 2926 days ago · 146 km deep · 58 km away
- 4.8121 km SSW of Hihifo, Tonga · 2926 days ago · 10 km deep · 29 km away
- 4.5128 km SSE of Hihifo, Tonga · 2925 days ago · 61 km deep · 43 km away
- 4.589 km SE of Hihifo, Tonga · 2919 days ago · 35 km deep · 77 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000g91n. Read Fri, Oct 2, 2026, 5:37 AM UTC.