Very strong mag. 6.3 earthquake - South Pacific Ocean, 110 km southeast of Nuku\'alofa, Tongatapu, on Thursday, 31 October 1963 at 03:17 (GMT)
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Very strong magnitude 6.3 earthquake at 17 km depth
Date & time: 31 Oct 1963 03:17:42 UTC
Depth: 16.5 km
Epicenter latitude / longitude: 22.05°S / 174.797°W (South Pacific Ocean, Tonga)
Nearest volcano: Unnamed 21.38°S/175.65°W (115 km / 71 mi)
Nearby towns and cities:
81 km (50 mi) SSE of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
106 km (66 mi) SSE of Kolonga (pop: 1,100) --> See nearby quakes!
110 km (68 mi) SSE of Nuku'alofa (pop: 22,400) --> See nearby quakes!
110 km (68 mi) SSE of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
253 km (157 mi) S of Pangai (pop: 1,740) --> See nearby quakes!
387 km (241 mi) SSW of Neiafu (pop: 4,320) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 atomic bombs!) More info
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
|M 6.3||17 km||Tonga region||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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More infoRecorded aftershocks, latest first (2 quakes):
- 20 Nov 1963 11:59 UTC| M 5.8 |30 km (18.6 mi) depth|53 km (33 mi) distance| USGS | Details
- 16 Nov 1963 22:43 UTC| M 6.2 |15 km (9.3 mi) depth|55 km (34 mi) distance| USGS | Very strong mag. 6.2 earthquake - South Pacific Ocean, 139 km south of Nuku'alofa, Tongatapu, on Saturday, 16 November 1963 at 22:43 (GMT)