M4.3 earthquake 185 km SW of Hihifo, Tonga
A magnitude 4.3 earthquake struck 185 km SW of Hihifo, Tonga on Sat, Jul 31, 2021, 2:48 PM GMT-12 (02:48 UTC), 245 km (152 mi) below the surface.
A larger quake followed: M4.5 122 km N 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
- 4.3 (mb), light
- Local time
- UTC
- 2021-08-01 02:48:43 UTC
- Depth
- 244.8 km (152.1 mi), intermediate-depth
- Epicenter
- 17.215° S, 174.937° 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 9.2 km horizontally, 8.5 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- From location
- Station coverage gap
- 134°
- Stations used
- 28
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.4121 km WSW of Hihifo, Tonga · 1884 days ago · 273 km deep · 98 km away
- 4.5122 km N of Neiafu, Tonga · 1880 days ago · 104 km deep · 88 km away
- 4.3138 km SSW of Hihifo, Tonga · 1867 days ago · 110 km deep · 75 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 97 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f2v8. Read Wed, Sep 30, 2026, 5:45 AM UTC.