M4.5 earthquake 161 km SSW of ‘Ohonua, Tonga
A magnitude 4.5 earthquake struck 161 km SSW of ‘Ohonua, Tonga on Sun, Jul 31, 1977, 4:06 PM GMT+13 (03:06 UTC), 123 km (76 mi) below the surface.
A larger quake followed: M4.8 234 km SW 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
- 4.5 (mb), light
- Local time
- UTC
- 1977-07-31 03:06:46 UTC
- Depth
- 123.0 km (76.4 mi), intermediate-depth
- Epicenter
- 22.728° S, 175.413° 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.
- Stations used
- 11
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.8234 km SW of ‘Ohonua, Tonga · 17947 days ago · 115 km deep · 97 km away
- 5.1141 km SW of Vaini, Tonga · 17944 days ago · 122 km deep · 81 km away
- 5.0186 km S of ‘Ohonua, Tonga · 17943 days ago · 33 km deep · 52 km away
- 4.9215 km S of ‘Ohonua, Tonga · 17942 days ago · 34 km deep · 78 km away
- 4.5144 km SW of Vaini, Tonga · 17938 days ago · 170 km deep · 95 km away
- 4.9160 km SW of ‘Ohonua, Tonga · 17938 days ago · 33 km deep · 54 km away
- 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 66 km away
- 4.3169 km SSW of ‘Ohonua, Tonga · 17906 days ago · 33 km deep · 12 km away
- 5.5241 km S of ‘Ohonua, Tonga · 17898 days ago · 15 km deep · 88 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000pxw. Read Tue, Sep 22, 2026, 8:27 AM UTC.