1997 Fiji-Tonga earthquake
- This article was considered for deletion at Wikipedia on November 22 2018. This is a backup of Wikipedia:1997_Fiji-Tonga_earthquake. All of its AfDs can be found at Wikipedia:Special:PrefixIndex/Wikipedia:Articles_for_deletion/1997_Fiji-Tonga_earthquake, the first at Wikipedia:Wikipedia:Articles_for_deletion/1997_Fiji-Tonga_earthquake.
The 1997 Fiji-Tonga earthquake occurred south of the Fiji Islands (about 190 km WSW of Nuku'alofa, Tonga, and 255 km SE of Ndoi Island) on 14 October at 09:53 UTC. This earthquake was located in the central part of the Fiji-Tonga subduction zone and it had a magnitude of Template:M 7.8. The rupture area was about ~50 km × 25 km, and the average slip was estimated to be 6 m. This earthquake could be felt in Wellington, New Zealand.
The Pacific Plate is subducting beneath the Australian Plate in the Fiji-Tonga subduction zone. The Tonga Trench is linear, fast converging, and seismically active. Mantle seismicity is active in this area. There is a belt of deep earthquakes in the west of the Tonga Trench. There are more earthquakes with focus depth h ≥ 300 km occurring in the Tonga-Kermadec region than in all other regions combined.
With a depth of 167 km, this was an intermediate depth earthquake. Thermo-petrologic models suggest that water may have an important role in the generating process for earthquakes of intermediate depths, as hydrous minerals may exist where intermediate depth seismicity is abundant.
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