Strong mag. 6.1 earthquake - South Pacific Ocean, 130 km southeast of Nuku\'alofa, Tongatapu, on Friday, 27 September 1985 at 10:10 (GMT)

Strong mag. 6.1 earthquake - South Pacific Ocean, 130 km southeast of Nuku\'alofa, Tongatapu, on Friday, 27 September 1985 at 10:10 (GMT)

Strong magnitude 6.1 earthquake at 33 km depth

Date & time: 27 Sep 1985 10:10:18 UTC
Magnitude: 6.1
Depth: 33.0 km
Epicenter latitude / longitude: 22.171°S / 174.606°W (South Pacific Ocean, Tonga)
Nearest volcano: Unnamed 21.38°S/175.65°W (139 km / 86 mi)
Nearby towns and cities:
100 km (62 mi) SSE of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
125 km (78 mi) SSE of Kolonga (pop: 1,100) --> See nearby quakes!
130 km (81 mi) SSE of Nuku'alofa (pop: 22,400) --> See nearby quakes!
130 km (81 mi) SSE of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
263 km (164 mi) S of Pangai (pop: 1,740) --> See nearby quakes!
397 km (247 mi) S of Neiafu (pop: 4,320) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 8.9 x 1013 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) More info
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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 6.133 kmTonga regionUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
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More info
Recorded aftershocks, latest first (3 quakes):
  • 16 Feb 1986 09:29 UTC
    | M 4.9 |
    33 km (20.5 mi) depth
    54 km (33 mi) distance
    | USGS | Details
  • 26 Nov 1985 06:18 UTC
    | M 5.5 |
    43.6 km (27.1 mi) depth
    50 km (31 mi) distance
    | USGS | Details
  • 10 Oct 1985 15:11 UTC
    | M 5.2 |
    33 km (20.5 mi) depth
    31 km (19 mi) distance
    | USGS | Details

Earlier earthquakes in the same area

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