Is the Alpine Fault a subduction zone?
At the origin of the Alpine fault, the Pacific plate and the Australian plate have a small jog, or notch, forming a tiny subduction zone of about 60 miles (100 km) by 120 miles (200 km).
Is the Alpine Fault a divergent boundary?
In the middle, the Alpine Fault is a transform boundary and has both dextral (right-lateral) strike-slip movement and uplift on the southeastern side. The uplift is due to an element of convergence between the plates, meaning that the fault has a significant high-angle reverse oblique component to its displacement.
Is the Alpine Fault a normal fault?
The Alpine Fault is called a strike slip or transform fault. 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. The mountains are rising at 7 millimetres a year, but erosion wears them down at a similar rate.
What is the nearest plate boundary to the Alpine Fault?
Australian-Pacific plate boundary
The Alpine Fault is the dominant structure defining the Australian-Pacific plate boundary in the South Island of New Zealand. It runs as a single structure for over 500 km between the Puysegur Trench in the south and the Marlborough Fault System in the northeast.
What plate boundary is New Zealand on?
New Zealand is on the boundary between the Australian and Pacific tectonic plates. These two plates are being pushed towards each other, but with different results in different parts of New Zealand. To the east of the North Island is a subduction zone, where the Pacific plate plunges down under the Australian plate.
What type of plate boundary is Christchurch on?
New Zealand sits on top of the boundary between the Pacific and Australian tectonic plates. The two plates slip past each other in the South Island, creating the Alpine Fault. Over time, the motion has built the Southern Alps. The uplift in the mountains makes it easy for geologists to identify the Alpine Fault.
What type of plate boundary is the Alpine?
transform boundary
The Alpine Fault is a geological fault, known as a right-lateral strike-slip fault, that runs almost the entire length of New Zealand’s South Island. It forms a transform boundary between the Pacific Plate and the Indo-Australian Plate.
What type of plate boundary is in New Zealand?
convergent boundary
Modern tectonic setting and earthquakes New Zealand is currently astride the convergent boundary between the Pacific and Australian Plates.
Is New Zealand overdue for earthquake?
Two tectonic plates meet beneath New Zealand’s west coast. Scientific analysis shows there’s been a major earthquake along the fault line every 300 years, and NZ is overdue. Caroline Orchison is helping communities prepare.
How fast in mm/yr is the Alpine Fault moving?
Every year the sides of the island nation’s Alpine Fault shift past one another about 30 millimeters—a blistering speed for strike-slip faults, which typically slip at rates closer to one or two millimeters a year.
What plate boundary is in New Zealand?
Is New Zealand on a destructive plate boundary?
The Hikurangi Trough marks the collision boundary to the east of the North Island, and is where oceanic lithosphere (the Pacific Plate) descends beneath the North Island as a huge inclined slab. As a result of this subduction, magmas are created at depth that give rise to New Zealand’s active volcanoes.
Did the Alpine Fault mylonites have low temperatures during formation?
Like many published CPOs, those from the Alpine Fault mylonites were attained during uplift and exhumation; therefore the temperatures occurring in the rocks were likely to be decreasing during formation of the fabrics and in many cases may have been lower than those suggested by mineral thermobarometry.
Where can I find the Alpine Fault?
The Alpine Fault trace can be seen near the Jerry and Pyke Rivers in the South Island. Would you like to take a short survey? This survey will open in a new tab and you can fill it out after your visit to the site.
What is the ISSN for the Alpine Fault Zone?
ISSN 0191-8141. ^ Atkinson, B. K.; White, S. H.; Sibson, R. H. (1981-01-01). “Structure and distribution of fault rocks in the Alpine Fault Zone, New Zealand”. Geological Society, London, Special Publications. 9 (1): 197–210. doi: 10.1144/GSL.SP.1981.009.01.18. ISSN 2041-4927. ^ Townend, John (2009).
Are mylonites caused by differential uplift and erosion?
yet the mylonites themselves display higher-grade mineral assemblages. The hypothesis of differential’ uplift and erosion is here put forward because before the relationship of the marginal syncline in Nelson and Southland can be considered it is essential to ensure that the metamorphic