Mag. 4.6 earthquake - Tonga on Saturday, 21 March 1987 at 16:33 (GMT)
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Light magnitude 4.6 earthquake at 244 km depth
Depth: 244.1 km
Epicenter latitude / longitude: 19.644°S / 175.864°W (Tonga)
Nearest volcano: Tofua (84 km / 52 mi)
Nearby towns and cities:
159 km (99 mi) W of Pangai (pop: 1,740) --> See nearby quakes!
180 km (112 mi) NNW of Nuku'alofa (pop: 22,400) --> See nearby quakes!
180 km (112 mi) NNW of Nuku‘alofa (pop: 22,400) --> See nearby quakes!
185 km (115 mi) NNW of Kolonga (pop: 1,100) --> See nearby quakes!
211 km (131 mi) NNW of ‘Ohonua (Ohonua) (pop: 1,240) --> See nearby quakes!
226 km (141 mi) WSW of Neiafu (pop: 4,320) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5 x 1011 joules (139 megawatt hours, equivalent to 120 tons of TNT) More info
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 4.6||244 km||Tonga||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.