Strong mag. 6.5 earthquake - Tonga on Wednesday, 24 September 1975 at 01:47 (GMT)

Strong mag. 6.5 earthquake - Tonga on Wednesday, 24 September 1975 at 01:47 (GMT)

Strong magnitude 6.5 earthquake at 33 km depth

Date & time: 24 Sep 1975 01:47:49 UTC
Magnitude: 6.5
Depth: 33.0 km
Epicenter latitude / longitude: 20.535°S / 173.994°W (Tonga)
Nearest volcano: Feinga Seamount (129 km / 80 mi)
Nearby towns and cities:
142 km (88 mi) ENE of Nuku'alofa (pop: 22,400) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.5 x 1014 joules (98.6 gigawatt hours, equivalent to 84802 tons of TNT or 5.3 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.
MagnitudeDepthLocationSource
M 6.533 kmTongaUSGS
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 of the 6.5 quake Tonga 24 September 1975 01:47 GMT

More info
Recorded aftershocks, latest first (2 quakes):
  • 27 Dec 1975 11:53 UTC
    | M 5.1 |
    37 km (23 mi) depth
    |
    107 km (66 mi) distance
    | USGS | Details
  • 02 Oct 1975 03:40 UTC
    | M 4.5 |
    33 km (20.5 mi) depth
    |
    19 km (12 mi) distance
    | USGS | Details

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Earlier earthquakes in the same area

Strong mag. 6.5 earthquake - Tonga on Wednesday, 24 September 1975 at 01:47 (GMT)
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