A 6.6 magnitude has struck 70km northwest of Tonga, this morning. The quake was at a 157km depth and the NWS Pacific Tsunami Warning Centre in the US said there is currently no tsunami threat.

Earthquake depths range from 50 to 450 km ... Bathymetry of a depth of 1 km is contoured to outline the Tonga Ridge, Tofua Arc, Lau Ridge, and Fiji Plateau, and contours of 7, 8, 9, and 10 ...