M4.3 earthquake 138 km SSW of Hihifo, Tonga
A magnitude 4.3 earthquake struck 138 km SSW of Hihifo, Tonga on Thu, Aug 19, 2021, 8:21 AM GMT-12 (20:21 UTC), 110 km (68 mi) below the surface.
A larger quake followed: M4.8 117 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
- 2021-08-19 20:21:15 UTC
- Depth
- 109.7 km (68.1 mi), intermediate-depth
- Epicenter
- 17.134° S, 174.239° 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 6.2 km horizontally, 8.3 km in depth
- Magnitude uncertainty
- ±0.09
- Depth from
- From location
- Station coverage gap
- 124°
- Stations used
- 41
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 7 in the 30 days before it.
After
- 4.386 km SSW of Hihifo, Tonga · 1865 days ago · 70 km deep · 57 km away
- 4.4115 km SSW of Hihifo, Tonga · 1840 days ago · 163 km deep · 26 km away
- 4.5120 km S of Hihifo, Tonga · 1822 days ago · 63 km deep · 66 km away
- 4.8117 km N of Neiafu, Tonga · 1822 days ago · 98 km deep · 54 km away
- 4.3142 km N of Neiafu, Tonga · 1821 days ago · 105 km deep · 38 km away
- 4.5162 km SW of Hihifo, Tonga · 1815 days ago · 197 km deep · 48 km away
- 4.5108 km SSW of Hihifo, Tonga · 1813 days ago · 156 km deep · 30 km away
Before
- 4.9125 km N of Neiafu, Tonga · 1870 days ago · 57 km deep · 64 km away
- 4.6Tonga · 1878 days ago · 130 km deep · 44 km away
- 4.666 km S of Hihifo, Tonga · 1879 days ago · 70 km deep · 82 km away
- 4.5122 km N of Neiafu, Tonga · 1880 days ago · 104 km deep · 48 km away
- 4.3185 km SW of Hihifo, Tonga · 1886 days ago · 245 km deep · 75 km away
- 5.387 km SSE of Hihifo, Tonga · 1887 days ago · 10 km deep · 80 km away
- 4.5187 km NW of Neiafu, Tonga · 1896 days ago · 261 km deep · 88 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000f5sf. Read Wed, Sep 30, 2026, 8:10 AM UTC.