M5.5 earthquake 104 km SE of Neiafu, Tonga
A magnitude 5.5 earthquake struck 104 km SE of Neiafu, Tonga on Fri, Jun 22, 1979, 9:50 AM GMT+13 (20:50 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.9 133 km E of Pangai, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1979-06-21 20:50:44 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 19.390° S, 173.361° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.5 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.13 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.1 | Mwc, centroid moment | Global CMT project | Preliminary |
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
- 58
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.9133 km E of Pangai, Tonga · 17265 days ago · 42 km deep · 75 km away
- 5.465 km NNE of Pangai, Tonga · 17259 days ago · 33 km deep · 84 km away
- 5.496 km ESE of Neiafu, Tonga · 17253 days ago · 33 km deep · 48 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00011fk (also filed as gcmtb062179c, gcmt19790621205044, iscgem663887). Read Thu, Oct 1, 2026, 12:48 PM UTC.