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The Auckland regional geologic faults have low seismic activity, [6] [1] compared to much of New Zealand, but do result in an earthquake risk to the Auckland metropolitan area, New Zealand's largest city.
The Alpine Fault is a geological fault that runs almost the entire length of New Zealand's South Island, being about 600 km (370 mi). [ a ] long, and forms the boundary between the Pacific plate and the Australian plate . [ 4 ]
Major active fault zones of New Zealand showing variation in displacement vector of Pacific plate relative to Australian plate along the boundary. The Marlborough fault system (also known as Marlborough tectonic domain [2]) is a set of four large dextral strike-slip faults and other related structures in the northern part of the South Island, New Zealand, which transfer displacement between ...
The North Island Fault System (NIFS) (also known as North Island Dextral Fault Belt or North Island Shear Belt [1]) is a set of southwest–northeast trending seismically-active faults in the North Island of New Zealand that carry much of the dextral (right lateral) strike-slip component of the oblique convergence of the Pacific Plate with the Australian Plate.
The Hikurangi Subduction Zone is an active subduction zone extending off the east coast of New Zealand's North Island, where the Pacific and Australian plates collide. [2] [3] The subduction zone where the Pacific Plate goes under the Kermadec Plate offshore of Gisborne accommodates approximately 6 cm/year (2.4 in/year) of plate movement while off the Wairarapa shore this decreases to perhaps ...
The Ostler Fault Zone (also Ostler Fault) is an active fault zone, to the east of the Alpine Fault in the Mackenzie District of Canterbury on New Zealand's South Island.It has had multiple recent rupture events greater than M L 6.5 in magnitude, with a recent 6.9 to 7.0 event, [2] and has recently accommodated 1.9 mm (0.075 in)/year [3] of compression and thus land contraction.
The Otago fault system (also known as Otago reverse fault province) contains multiple faults with the potential to have rupture events greater than M w 7 in magnitude. [2] [3] These are parallel to, and to the east of the Alpine Fault in the south eastern part of the South Island of New Zealand. It accommodates about 2 mm (0.079 in)/year of ...
The Wellington Fault is an active seismic fault in the southern part of the North Island of New Zealand. It is a dextral (right-lateral) strike-slip fault with variable amounts of vertical movement causing uplift to the northwest, as expressed by a series of ranges.