Mag. 4.9 earthquake - Tonga (Samoa) on Friday, 21 July 1978 at 07:22 (GMT)
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Light magnitude 4.9 earthquake at 33 km depth
Depth: 33.0 km
Epicenter latitude / longitude: 15.298°S / 173.168°W (Samoa)
Nearest volcano: Curacoa (65 km / 40 mi)
Nearby towns and cities:
99 km (62 mi) NE of Hihifo (Tonga) (pop: 815) --> See nearby quakes!
195 km (121 mi) SSW of Vailoa (pop: 769) --> See nearby quakes!
204 km (126 mi) SW of Mulifanua (pop: 4,510) --> See nearby quakes!
206 km (128 mi) SSW of Asau (pop: 6,640) --> See nearby quakes!
212 km (132 mi) SW of Fasito‘outa (pop: 2,100) --> See nearby quakes!
221 km (138 mi) SSW of Safotu (pop: 1,210) --> See nearby quakes!
222 km (138 mi) SW of Apia (pop: 40,400) --> See nearby quakes!
232 km (144 mi) SW of Lufilufi (pop: 1,070) --> See nearby quakes!
284 km (177 mi) WSW of Tāfuna (Tualauta, American Samoa) (pop: 11,000) --> See nearby quakes!
288 km (179 mi) WSW of Pago Pago (Ma'Oputasi, American Samoa) (pop: 11,500) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 1012 joules (392 megawatt hours, equivalent to 338 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 4.9||33 km||Tonga (Samoa)||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.