M4.6 earthquake 181 km SSW of ‘Ohonua, Tonga
A magnitude 4.6 earthquake struck 181 km SSW of ‘Ohonua, Tonga on Sat, Sep 18, 2021, 5:42 AM GMT+13 (16:42 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.0 169 km S of ‘Ohonua, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-09-17 16:42:22 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 22.939° S, 175.314° 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 12.5 km horizontally, 1.9 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- Operator assigned
- Station coverage gap
- 133°
- Stations used
- 27
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 6 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.3146 km SSE of ‘Ohonua, Tonga · 1827 days ago · 10 km deep · 97 km away
- 4.5139 km SSE of ‘Ohonua, Tonga · 1802 days ago · 10 km deep · 87 km away
- 5.0169 km S of ‘Ohonua, Tonga · 1799 days ago · 10 km deep · 41 km away
- 4.7148 km S of ‘Ohonua, Tonga · 1795 days ago · 10 km deep · 60 km away
- 4.8Tonga region · 1795 days ago · 10 km deep · 33 km away
- 4.2148 km SSE of ‘Ohonua, Tonga · 1788 days ago · 10 km deep · 83 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000fc68. Read Thu, Oct 1, 2026, 8:00 AM UTC.