Strong mag. 6.4 earthquake - Tonga on Friday, 7 February 1997 at 08:41 (GMT)

Strong mag. 6.4 earthquake - Tonga on Friday, 7 February 1997 at 08:41 (GMT)

Strong magnitude 6.4 earthquake at 28 km depth

Date & time: 7 Feb 1997 08:41:13 UTC
Magnitude: 6.4
Depth: 28.0 km
Epicenter latitude / longitude: 19.859°S / 173.289°W (Tonga)
Nearest volcano: Unnamed (180 km / 112 mi)
Nearby towns and cities:
112 km (69 mi) E of Pangai (pop: 1,740) --> See nearby quakes!
153 km (95 mi) SSE of Neiafu (pop: 4,320) --> See nearby quakes!
233 km (145 mi) NE of Kolonga (pop: 1,100) --> See nearby quakes!
238 km (148 mi) NE of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
245 km (152 mi) NE of Nuku'alofa (pop: 22,400) --> See nearby quakes!
245 km (152 mi) NE of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
365 km (227 mi) WSW of Alofi (Niue) (pop: 624) --> See nearby quakes!
370 km (230 mi) WSW of Hakupu (Niue) (pop: 221) --> See nearby quakes!
376 km (234 mi) WSW of Mutalau (Niue) (pop: 133) --> See nearby quakes!
438 km (272 mi) S of Hihifo (pop: 815) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 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 6.428 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 6.4 quake Tonga 7 February 1997 08:41 GMT

More info
Recorded aftershocks, latest first (6 quakes):
  • 29 Jun 1997 00:41 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    69 km (43 mi) distance
    | USGS | Details
  • 06 May 1997 19:39 UTC
    | M 4.4 |
    33 km (20.5 mi) depth
    |
    63 km (39 mi) distance
    | USGS | Details
  • 05 Apr 1997 15:46 UTC
    | M 4.7 |
    33 km (20.5 mi) depth
    |
    53 km (33 mi) distance
    | USGS | Details
  • 05 Apr 1997 04:47 UTC
    | M 5.0 |
    33 km (20.5 mi) depth
    |
    77 km (48 mi) distance
    | USGS | Details
  • 26 Mar 1997 19:21 UTC
    | M 4.9 |
    33 km (20.5 mi) depth
    |
    70 km (43 mi) distance
    | USGS | Details
  • 09 Feb 1997 23:11 UTC
    | M 5.0 |
    39.8 km (24.7 mi) depth
    |
    55 km (34 mi) distance
    | USGS | Details

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Earlier earthquakes in the same area

Strong mag. 6.4 earthquake - Tonga on Friday, 7 February 1997 at 08:41 (GMT)
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