Strong mag. 6.8 earthquake - South Pacific Ocean, 134 km west of Nuku\'alofa, Tongatapu, on Tuesday, 13 April 1999 at 10:38 (GMT)

Strong mag. 6.8 earthquake - South Pacific Ocean, 134 km west of Nuku\'alofa, Tongatapu, on Tuesday, 13 April 1999 at 10:38 (GMT)

Strong magnitude 6.8 earthquake at 164 km depth

Date & time: 13 Apr 1999 10:38:48 UTC
Magnitude: 6.8
Depth: 164.2 km
Epicenter latitude / longitude: 21.422°S / 176.46°W (South Pacific Ocean, Tonga)
Nearest volcano: Unnamed 21.15°S/175.75°W (80 km / 50 mi)
Nearby towns and cities:
133 km (82 mi) WSW of Haveluloto (pop: 3,420) --> See nearby quakes!
134 km (83 mi) WSW of Nuku'alofa (pop: 22,400) --> See nearby quakes!
134 km (83 mi) WSW of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
148 km (92 mi) WSW of Kolonga (pop: 1,100) --> See nearby quakes!
157 km (97 mi) W of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
283 km (176 mi) SW of Pangai (pop: 1,740) --> See nearby quakes!
402 km (250 mi) SW of Neiafu (pop: 4,320) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1 x 1015 joules (278 gigawatt hours, equivalent to 2.4 x 105 tons of TNT or 14.9 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.
MagnitudeDepthLocationSource
M 6.8164 kmFiji region (Tonga)USGS
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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Aftershocks

More info
Recorded aftershocks, latest first (3 quakes):
  • 08 Oct 1999 22:13 UTC
    | M 5.6 |
    183.8 km (114.2 mi) depth
    |
    58 km (36 mi) distance
    | USGS | Details
  • 24 Aug 1999 02:11 UTC
    | M 5.2 |
    148.8 km (92.5 mi) depth
    |
    17 km (11 mi) distance
    | USGS | Details
  • 07 Aug 1999 06:17 UTC
    | M 5.6 |
    33 km (20.5 mi) depth
    |
    56 km (35 mi) distance
    | USGS | Details

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Earlier earthquakes in the same area

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