1977 Tonga earthquake

The 1977 Tonga earthquake took place on 23 June at 01:08:33 local time some 200 km southwest of Tongatapu, with shocks affecting all islands of the kingdom of Tonga. The earthquake measured 8.0 on the moment magnitude scale and had a maximum intensity of VIII (Severe) on the Mercalli intensity scale.

UTCtime

• 1977-06-22 12:08:33

ISCevent

• 697569

USGS-ANSS

• ComCat

Localdate

• 23 June 1977 (1977-06-23)

Quick facts UTC time, ISC event ...

1977 Tonga earthquake

Location within Oceania
UTC time	1977-06-22 12:08:33
ISC event	697569
USGS-ANSS	ComCat
Local date	23 June 1977 (1977-06-23)
Local time	01:08:33
Magnitude	8.0 Mw[1]
Depth	55 km (34 mi)[1]
Epicenter	22.89°S 175.71°W / -22.89; -175.71[1]
Type	Normal[2]
Max. intensity	MMI VIII (Severe)[3]
Casualties	yes

Close

The earthquake caused considerable damage to the infrastructures and some fatalities in most Tongan islands,^[3] with the most damage in Tongatapu and ʻEua and the least damage in Ha'apai and Vava'u.^[4]