M4.8 earthquake 278 km SSW of ‘Ohonua, Tonga
A magnitude 4.8 earthquake struck 278 km SSW of ‘Ohonua, Tonga on Thu, Jun 30, 1977, 4:14 PM GMT+13 (03:14 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 215 km SSW 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
- 4.8 (mb), light
- Local time
- UTC
- 1977-06-30 03:14:09 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 23.778° S, 175.602° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 5 in the 60 days after this one and 6 in the 30 days before it.
After
- 5.1215 km SSW of ‘Ohonua, Tonga · 17970 days ago · 42 km deep · 67 km away
- 5.0214 km S of ‘Ohonua, Tonga · 17968 days ago · 63 km deep · 67 km away
- 4.4269 km S of ‘Ohonua, Tonga · 17968 days ago · 33 km deep · 37 km away
- 4.9215 km S of ‘Ohonua, Tonga · 17942 days ago · 34 km deep · 87 km away
- 5.3224 km SSW of ‘Ohonua, Tonga · 17935 days ago · 33 km deep · 55 km away
Before
- 4.7236 km S of ‘Ohonua, Tonga · 17982 days ago · 33 km deep · 50 km away
- 5.2204 km S of ‘Ohonua, Tonga · 17982 days ago · 38 km deep · 80 km away
- 4.8244 km S of ‘Ohonua, Tonga · 17983 days ago · 33 km deep · 39 km away
- 4.7243 km S of ‘Ohonua, Tonga · 17983 days ago · 47 km deep · 44 km away
- 4.9212 km S of ‘Ohonua, Tonga · 17987 days ago · 33 km deep · 98 km away
- 5.0south of Tonga · 17989 days ago · 8 km deep · 85 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000pj8. Read Tue, Sep 22, 2026, 8:53 AM UTC.