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The broadly East-West fault structures of the Auckland region are initially defined by the southern faults of the Northland Allochthon, such as to the west the Rewhiti-Haupai Fault and to the east the Okura Thrust Fault. To the east, these continue until they reach the North-South aligned East Coast Bays Fault.
Wikipedia:Map data/Auckland regional faults; Map of Auckland region active faults (red #ff0000), and known (dark grey #000000 with opacity 0.5) or partially characterised inactive faults (grey #444444) and volcanoes with the type of volcanic eruption (some are composite) indicated by scoria cone (red), or phreatomagmatic eruptions tuff ring ...
Map of active faults (red #ff0000), and known (dark grey #000000 with opacity 0.5) or partially characterised inactive faults (grey #444444) in the Auckland region
The structure of the Auckland regional faults and the resulting fault blocks is complex but like the volcanic field their locations can be postulated to be related to gravitational variations and where the Stokes Magnetic Anomaly passes through this section of the North Island. [7] [8] A north south line of central volcanoes is orientated along ...
The Wairoa North Fault has had some notable seismic events in the past: 1835 Auckland Earthquake: A magnitude 6.5 earthquake struck Clevedon, New Zealand, with its epicenter located on the Waikopua segment of the Wairoa North Fault, and with a depth of 25 km. [5] [6] The shaking of the quake was felt strongly throughout the Auckland region, potentially causing damage to buildings and ...
The Auckland region lies within the Australian Plate, about 400 kilometres (250 mi) west of its plate boundary with the Pacific Plate. [18] The volcanoes are located south of a geological region called the Northland Allochthon, and with the northern volcanoes located over early Miocene sedimentary deposits of the Waitematā Group of rocks and the southern volcanoes over post Miocene sediments ...
To map the subduction zone, researchers at sea performed active source seismic imaging, a technique that sends sound to the ocean floor and then processes the echoes that return. The method is ...
The Auckland Volcanic Province comprises the Auckland, South Auckland, Ngatutura and Okete volcanic fields. Intra-plate basaltic volcanism in the Auckland region started in the south, at Okete, near Raglan in late Pliocene times (2.7-1.8 Ma), and has moved north through the Ngatutura, South Auckland and Auckland fields since then. [5] [9]