It forms the sharp line separating the snow-covered Southern Alps in the east from the low coastal plain bordering the Tasman Sea in the west. [4] Bird considers them to be unconnected. The south-eastern side is a divergent boundary with the Nazca Plate forming the East Pacific Rise. We want you to really understand what you'll be looking at when you're up at the fault, so before we go, we'll give you a short educational introduction to the geological process of plate tectonics - and where New Zealand fits in. The Alpine Fault forms part of the on-land Pacific-Australian plate boundary. Most transform faults are found in the ocean basin and connect offsets in the mid-ocean ridges. The Alpine Fault (AF) is a major continental plate boundary between the Australian and Pacific plates, linking oppositely-dipping subduction zones in New Zealand. The southern part of Zealandia, which is to the east of this boundary, is the plate's largest block of … [7], An oceanic tectonic plate under the Pacific Ocean, "Here are the Sizes of Tectonic or Lithospheric Plates", "On the enigmatic birth of the Pacific Plate within the Panthalassa Ocean", https://en.wikipedia.org/w/index.php?title=Pacific_Plate&oldid=993308368, Short description is different from Wikidata, Articles with unsourced statements from December 2014, Creative Commons Attribution-ShareAlike License, This page was last edited on 9 December 2020, at 23:11. [3], Hillis and Müller are reported to consider the Bird's Head Plate to be moving in unison with the Pacific Plate. The Alpine Fault. The next level of complexity in explanation addresses the transpressive nature of the Alpine Fault, and the consequent development and continued growth of the Southern Alps. With the development of plate tectonics in the 1970s, the Alpine Fault was recognised as part of the boundary between Pacific and Australian plates. It includes an oceanic transform (the Macquarie Ridge), two oppositely verging subduction zones (Puysegur and Hikurangi), and a transpressive continental transform, the Alpine Fault through South Island, New Zealand. Spot the fault. It’s the "on-land" boundary of the Pacific and Australian Plates. In between, through most of the South Island, the two plates grind past each other along the Alpine Fault. It runs as a single structure for over 500 km. learning modules, with more coming soon. A smaller number connect mid-ocean ridges and subduction zones. [1] The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. In the simple, introductory textbook explanation, the Alpine Fault plate boundary system through South Island, New Zealand is simply a "San Andreas-like continental transform that links two subduction zones. Find out how it was discovered and learn what science can tell us about Alpine Fault earthquakes. There are currently three What’s On Our Plates? You can pick out the line of the Alpine Fault on this satellite image of the South Island. This study analyzes 195 earthquakes recorded during the 6 month duration of the Southern Alps Passive Seismic Experiment (SAPSE) in 1995/1996 and two M₁. [5], The north-eastern side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan de Fuca Ridge and the Gorda Ridge. In the middle of the eastern side is a transform boundary with the North American Plate along the San Andreas Fault, and a boundary with the Cocos Plate. [6], The Pacific Plate originated at the triple junction of the three main oceanic plates of Panthalassa, the Farallon, Phoenix, and Izanagi Plates, around 190 million years ago.The plate formed because the triple junction had converted to an unstable form surrounded on all sides by transform faults, due to the development of a kink in one of the plate boundaries. The Alpine Fault is one of the world's major plate boundaries and New Zealand's most hazardous earthquake-generating fault. The Alpine Fault is one of the world's major plate boundaries and New Zealand's most hazardous earthquake-generating fault. Then come back to the surface and find out about the geo-science underway to unlock the secrets of the Hikurangi subduction zone. The southern part of Zealandia, which is to the east of this boundary, is the plate's largest block of continental crust. A: The Hikurangi Trench and Alpine Fault form part of the Australian-Pacific plate boundary that transects New Zealand. The Alpine fault is the Pacific-Australian plate boundary in the South Island of New Zealand. The northern side is a convergent boundary subducting under the North American Plate forming the Aleutian Trench and the corresponding Aleutian Islands. AF8 [Alpine Fault Magnitude 8] is an award-winning programme of scientific modelling, response planning and community engagement designed to build a collective resilience and preparedness to the next Alpine Fault earthquake event. The Alpine fault marks the plate boundary between the Australian and Pacific plates, which are converging obliquely at a rate of--36 mm/yr parallel and 10 mm/yr normal to the fault (37 mm/yr relative plate motion at 43.5ø,170 0 ø, calculated with . The Alpine Fault, which runs for about 600km up the spine of the South Island, is one of the world’s major geological features. The Southern Alps build societal preparedness to natural hazard events in the South Island of New Zealand glacier... 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