Expert Reactions | Published: 28 June 2012 29 June 2012. It is a dominant feature of the South Island.

While the fault is generally a conspicuous feature resulting from the offsetting of moraine, fan and other Quaternary deposits, its precise location is generally not known other than that it is commonly within scarps between 20m and 140m wide. Ms Cooper lives near the Alpine Fault, which is likely to rupture within the lifetime of many New Zealanders. It’s the "on-land" boundary of the Pacific and Australian Plates. The Alpine Fault, which runs for about 600km up the spine of the South Island, is one of the world’s major geological features. At its northern end, the Alpine Fault splays out into the Marlborough faults, some onshore, some offshore, some connected but with different names. ABSTRACTThe Alpine Fault is very well delineated by recent high-resolution aeromagnetic data sets over much of its length in New Zealand’s South Island. The Alpine Fault is a geological fault, specifically a right-lateral strike-slip fault, that runs almost the entire length of New Zealand’s South Island. The active Alpine Fault extends through the southeast of the Tasman District in a topographic corridor between St Arnaud and Tophouse. READ MORE: * Alpine Fault rupture planning gets $245k boost * Bracing for the big one: The looming threat of a major earthquake in Nelson-Tasman * Queenstown conference told of potential impact of alpine fault rupture * Are we ready?What to expect when the Alpine Fault ruptures. The Alpine Fault is where two great tectonic plates (the Pacific and Australian) plates collide. The West Coast. The MarlboroughNorth Island dextral shear zone, together with the Fiordland and NW Nelson sinistral shear zones, demonstrate these shears to result from lateral drag within these zones and is only partially transmitted to the central section of the Alpine fault which is dominantly reverse in character. Movement along this fault has uplifted the Southern Alps and produced large earthquakes. Council has sought expert advice about improving the accuracy of the mapping of earthquake fault lines that may affect the region, as well as the identification of areas where liquefaction is possible in the event of a major earthquake. This fault has ruptured four times in the past 900 years, each time producing an earthquake of about magnitude 8. ‘Well behaved’ Alpine fault – experts respond.

The Alpine Fault is one of the world's most intensively studied faultlines. The mountains are rising at 7 millimetres a year, but erosion wears them down at a similar rate. It forms a transform boundary between the Pacific Plate and the Indo-Australian Plate. Earthquakes along the fault, and the associated earth movements, have formed the Southern Alps. The Australian plate is sliding horizontally towards the north-east, at the same time as the Pacific plate is pushing up, forming the Southern Alps. Scientists have established that the fault has ruptured 27 times over the last 8000 years.

WIDTH OF THE ALPINE FAULT ZONE, NEW ZEALAND DONALD H. KUPFER Louisiana State University* (Received for publication, 1 May 1963) ABSTRACT 685 The Alpine Fault of New Zealand i's sometimes thought to be very narrow in comparison with other strike-slip faults of large displacement. But good behaviour, in a scientific sense, may not bring much comfort to South Islanders. Visible from space, it marks the boundary between the Pacific and Australian crustal plates and runs along the western spine of the Southern Alps for about 650km from Marlborough, heading out to … The Nelson region has the potential to be affected by earthquakes, including the rupture of local fault lines. New research out today reveals that the Alpine Fault – a strike-slip fault running almost the entire length of the South Island – is surprisingly “well-behaved” in its regularity.

Buckendahl said people need to understand the 'big picture' to grasp how they will be affected. Approximate rupture dates are 1717AD, 1620 AD, 1450 AD, and 1100 AD. How these interact in a single earthquake is not fully understood. The Alpine Fault is called a strike slip or transform fault.


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