Moderate mag. 5.1 earthquake - Tonga on Friday, 20 February 1981 at 14:33 (GMT)

Moderate mag. 5.1 earthquake - Tonga on Friday, 20 February 1981 at 14:33 (GMT)

Moderate magnitude 5.1 earthquake at 241 km depth

Date & time: 20 Feb 1981 14:33:54 UTC
Magnitude: 5.1
Depth: 241.2 km
Epicenter latitude / longitude: 19.82°S / 175.588°W (Tonga)
Nearest volcano: Tofua (55 km / 34 mi)
Nearby towns and cities:
129 km (80 mi) W of Pangai (pop: 1,740) --> See nearby quakes!
152 km (95 mi) NNW of Nuku'alofa (pop: 22,400) --> See nearby quakes!
152 km (95 mi) NNW of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
156 km (97 mi) NNW of Kolonga (pop: 1,100) --> See nearby quakes!
181 km (112 mi) NNW of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
213 km (132 mi) SW of Neiafu (pop: 4,320) --> See nearby quakes!
470 km (292 mi) SSW of Hihifo (pop: 815) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.8 x 1012 joules (783 megawatt hours, equivalent to 674 tons of TNT) 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 5.1241 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 5.1 quake Tonga 20 February 1981 14:33 GMT

More info
Recorded aftershocks, latest first (0 quakes):
So far, no aftershocks have been registered.
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Earlier earthquakes in the same area

Moderate mag. 5.1 earthquake - Tonga on Friday, 20 February 1981 at 14:33 (GMT)
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