M4.0 earthquake 73 km NE of Kolonga, Tonga
A magnitude 4.0 earthquake struck 73 km NE of Kolonga, Tonga on Mon, Jul 27, 2015, 1:23 AM GMT+13 (12:23 UTC), 430 km (267 mi) below the surface.
A larger quake followed: M4.6 69 km N 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
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2015-07-26 12:23:34 UTC
- Depth
- 430.3 km (267.4 mi), deep
- Epicenter
- 20.689° S, 174.542° 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 23.1 km horizontally, 11.8 km in depth
- Magnitude uncertainty
- ±0.16
- Depth from
- From location
- Station coverage gap
- 191°, poorly surrounded by stations
- Stations used
- 17
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 8 in the 30 days before it.
After
- 4.669 km N of Nuku‘alofa, Tonga · 4085 days ago · 115 km deep · 74 km away
- 4.455 km NNE of Kolonga, Tonga · 4041 days ago · 146 km deep · 31 km away
Before
- 5.252 km N of Kolonga, Tonga · 4094 days ago · 10 km deep · 51 km away · felt by 2
- 4.4100 km ENE of ‘Ohonua, Tonga · 4108 days ago · 10 km deep · 73 km away
- 5.1102 km ENE of ‘Ohonua, Tonga · 4108 days ago · 10 km deep · 77 km away
- 4.880 km ENE of Kolonga, Tonga · 4109 days ago · 35 km deep · 16 km away
- 4.969 km NE of Kolonga, Tonga · 4109 days ago · 35 km deep · 4 km away
- 5.875 km NE of Kolonga, Tonga · 4109 days ago · 44 km deep · 5 km away · felt by 9
- 4.682 km SE of Pangai, Tonga · 4112 days ago · 10 km deep · 72 km away
- 5.285 km E of ‘Ohonua, Tonga · 4115 days ago · 10 km deep · 80 km away
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000328f. Read Mon, Oct 5, 2026, 6:40 AM UTC.