M5.6 earthquake 143 km SSW of Hihifo, Tonga
A magnitude 5.6 earthquake struck 143 km SSW of Hihifo, Tonga on Sat, Mar 19, 1966, 7:47 PM GMT-12 (07:47 UTC), 121 km (75 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mw), moderate
- Local time
- UTC
- 1966-03-20 07:47:52 UTC
- Depth
- 121.3 km (75.4 mi), intermediate-depth
- Epicenter
- 17.222° S, 174.065° 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.
- Magnitude uncertainty
- ±0.53
- Depth from
- From location
Nearby
Within 100 km, magnitude 2.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem849411. Read Tue, Sep 22, 2026, 5:24 AM UTC.