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Strong mag. 6.0 earthquake - South Pacific Ocean, 108 km south of Nuku\'alofa, Tongatapu, on Monday, 4 January 1993 at 20:41 (GMT)
Strong magnitude 6.0 earthquake at 33 km depth
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Date & time: 4 Jan 1993 20:41:11 UTC
Magnitude: 6Depth: 33.0 km
Epicenter latitude / longitude: 22.055°S / 174.866°W
(
South Pacific Ocean,
Tonga)
Nearest volcano:
Unnamed 21.38°S/175.65°W (110 km / 68 mi)
Nearby towns and cities:81 km (50 mi) S of ‘Ohonua (Ohonua) (pop: 1,240) -->
See nearby quakes!105 km (65 mi) SSE of Kolonga (pop: 1,100) -->
See nearby quakes!108 km (67 mi) SSE of Nuku'alofa (pop: 22,400) -->
See nearby quakes!108 km (67 mi) SSE of Nuku‘alofa (pop: 22,400) -->
See nearby quakes!255 km (158 mi) S of Pangai (pop: 1,740) -->
See nearby quakes!390 km (242 mi) SSW of Neiafu (pop: 4,320) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 6.3 x 10
13 joules (17.5 gigawatt hours, equivalent to 15080 tons of TNT or 0.9 atomic bombs!)
More info[show map]
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Data for the same earthquake reported by different agencies
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| Magnitude | Depth | Location | Source |
| M 6.0 | 33 km | Tonga region | USGS |
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.
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Aftershocks
More info
Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 100 km
2 (=39 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 17 km (11 mi).
Aftershocks typically occur during the weeks and months following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the
map below to verify).
18 Apr 1993 10:31 UTC
| M 5.0 | 42.8 km (26.6 mi) depth
| 41 km (25 mi) distance
| USGS | Details20 Feb 1993 07:11 UTC
| M 5.5 | 43.7 km (27.2 mi) depth
| 7 km (4 mi) distance
| USGS | Details
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