The quake prompted a brief “Tsunami Threat” for Tonga. Preliminary reports from ... U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake that ...

(Reuters) -A magnitude 7 earthquake struck Tonga on Sunday, the German Research Centre for Geosciences (GFZ) said. The quake was at a depth of 16 km (10 miles), GFZ said. GFZ had earlier pegged ...