alpine wairau fault

Smaller Faults Kekerengu Fault The Alpine Fault is a geological fault, more specifically 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. To embed this content on your own webpage, cut and paste the following: , for easy access to all your favourite programmes, Podcast (MP3) The Wairau Fault is an active dextral (right lateral) strike-slip fault in the northeastern part of South Island, New Zealand. 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. “It’s important because it points either towards or away from Wellington and that could have a significant impact on the level of ground shaking in the next earthquake.”. The city of Wellington was built, unknowingly, on another active fault. [1] The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. The Kēkerengū Fault in the north east of South Island moved during the Kaikōura quake and he says it is displaying scratch marks akin to “lazy rainbows”. Figure 7 … The horizontal strain rate northwest of the Wairau fault is a small east-west uniaxial contraction (•0.1 ppm yr -1). It forms part of the Marlborough Fault System , which accommodates the transfer of displacement along the oblique convergent boundary between the Indo-Australian Plate and Pacific Plate , from the transform Alpine Fault to the Hikurangi Trench subduction zone . Depending on the precise definition used, the Wairau Fault runs either from southern or northern end of 'The Bends' region. Meaning the shaking will be a lot stronger, or did it go away from you?”. The trench site at Tophouse Saddle on the Wairau section of the Alpine Fault indicates there has been an earthquake rupture since AD 200 but how long after this date cannot be determined. Photo: RNZ/Tracy Neal. “We take out excavators and dig along the fault and like an archaeologist gently remove layers of the earth until we get along that plain where the displacement happened, and we start recording the shape of the scratch marks. “Our hope in this investigation is to shed more light on the aspects of those earthquakes, largely which direction they rupture from,” Van Dissen told Summer Times. Ten gravity traverses, between 7 and 18 km long, have been run across the Alpine fault, New Zealand. The Hope fault is thought to represent the primary continuation of the Alpine fault. We’ve known about the Alpine Fault for 80+ years, but there is still so much to learn. LiDAR laser scanning maps show major fault lines in the Marlborough region, offshoots of the Alpine Fault. Oranga Tamariki chief executive Grainne Moss steps down, Bryan Waddle: forty years commentating cricket. The Alpine Fault last got seriously testy in 1717 or thereabouts and before that, in descending order, 1620, 1430 and 1100. His research team are digging along the Kēkerengū Fault conducting a kind of archaeology, he says. The South Island's renowned Alpine Fault traverses the length of the Wairau Valley. It runs northeast from the northern side of the entrance to Milford Sound, ... Awatere and Wairau faults. Russ Van Dissen in the Kēkerengū Fault line rupture. “It’s important because it points either towards or away from Wellington and that could have a significant impact on the level of ground shaking in the next earthquake.” In the latter case it is regarded as a separate fault and runs about 100 km from near Lake Rotoiti to Cloudy Bay in the east. Wairau section of the Alpine Fault, Renwick area, Marlborough District. New Zealand Earthquake fault zones including Kaikoura Area, Livingstone, Porters Pass-Amberly, Medbury, Cant Range Front, Spey-Mica Burn and Porters Pass-Amberly Fault Zone. The Wairau Fault is sometimes regarded as a direct continuation of the Alpine Fault and may be referred to as the Alpine-Wairau Fault. The Alpine Fault, which runs about 600km up the western side of the South Island between Milford Sound and Marlborough, poses one of the biggest natural threats to New Zealand. plates. The Alpine Fault quickly became accepted as a notable feature of the geology of New Zealand, and by 1948 was included on standard geological maps. The Kaikōura earthquake revealed a number of faults that were unknown, and geologists are constantly learning and adding to the sum of our knowledge, he says. These traverses range from the Haast River in the south to the Wairau River 470 km to the north. New Zealand Earthquake Faults. Russ Van Dissen in the Kēkerengū Fault line rupture. “And the shape of those scratch marks very well could have clues on which way the rupture moved from, or propagated from.”. The Alpine Fault is the boundary between the Pacific crustal plate and the Australian plate. The Wairau Fault links up with the Alpine Fault near the Nelson Lakes it extends for about 140 kilometres, he says. Further to the east only the southernmost strand can be detected. Judith Zachariasen, Kelvin Berryman, Carol Prentice, Robert Langridge, Mark Stirling, Pilar Villamor, Michael Rymer, IGNS (EQC funded project 99/389) Abstract. The Wairau Fault ruptured on average at least every 2000 years, Langridge said. Maps. The Wairau Fault links up with the Alpine Fault near the Nelson Lakes it extends for about 140 kilometres, he says. Wairau Valley, it was not caused by movement on the Wairau Fault. 1). Fault Zone and the Alpine Fault Figure 4 – Active faults in Marlborough District. The average recurrence interval for earthquakes along this fault is in the range 1150–1400 yrs. At its northern end near Rotoiti, Nelson Lakes the Alpine Fault links with the Wairau Fault, which extends 140km along the Wairau Valley to the Marlborough coast. Figure 5 – The Wairau section of the Alpine Fault in Marlborough District Figure 6 – Photograph of the active fault trace of the Wairau section of the Alpine Fault near SH 63 and Hillersden. Geologists have now identified many of these lines of weakness, and there is greater awareness of the hazards of building where the earth may suddenly shift again. A new study, led by GNS Science, seeks to understand how the Wairau Fault moves when it ruptures. The Wairau Fault is the continuation of the Alpine Fault and in terms of the total dextral displacement of 500 km we suggest that up to 1 Myr ago the line of extension was along the North Island Shear Belt. “Better design parameters and this is what we are aiming for. “As one side of a fault moves past another it makes scratch marks, you can imagine like a bear claw ripping across the plain as one side moves past the other. “We’ve done modelling that’s consistent with [the idea] if the rupture’s moving towards you the shape of the rainbow is convex, it looks like a rainbow instead of a U but on the other side of the rupture it should look like a U.”. The Alpine Fault, which runs about 600km up … Those dates were … But what might be a surprise is how little we understand about some of them, and that we're still finding new ones. Log in to add tags. The Alpine Fault is a geological fault that runs almost the entire length of New Zealand's South Island (c. 480 km) and forms the boundary between the Pacific Plate and the Indo-Australian Plate. It forms part of the Marlborough Fault System, which accommodates the transfer of displacement along the oblique convergent boundary between the Indo-Australian Plate and Pacific Plate, from the transform Alpine Fault to the Hikurangi Trench subduction zone. A discovery made in the wake of 2016's Kaikoura Earthquake could help scientists better understand how the big-risk Alpine Fault may unravel. This component exhibits little variation west of the Alpine (Wairau) fault, and shows an almost linear variation from the Wairau fault to the east coast. The Alpine fault is defined as the 650 km long feature that extends the length of the South Island. The estimated average slip for each event is about 6 m.[2], The recurrence interval of slip events estimated for the fault combined with the estimated time since the last event suggest "that the Wairau Fault is nearing the end of its interseismic period". Though the motion resolved on the southern Alpine Fault is almost purely strike‐slip, a ubiquitous normal component is associated with net uplift of the AUS plate. The Wairau Fault is an active dextral (right lateral) strike-slip fault in the northeastern part of South Island, New Zealand. The Alpine Fault is believed to align with the Macquarie Fault Zone in the Puysegur Trench off the southwestern corner of the South Island. Many of the larger faults are oblique strike slip faults, having a combination of sideways and vertical movement.To explore in detail a map of New Zealand's known active faults go to our active faults database and click on the link near the bottom of the page.. “We’re getting a lot better at recognising the dominoes, but what we need to start learning better is how they may fall.”. His team are observing scratch marks made along the Faultline to see if it gives a clue as to how a rupture is likely to behave, he says. A new study, led by GNS Science, seeks to understand how the Wairau Fault moves when it ruptures. Because of the uncertainties of correlation with faults in the North Island, which are beyond the scope In the former case it is regarded as the Wairau segment of the Alpine Fault. Trenching studies along the trace of the Wairau Fault have identified four dateable slip events within this interval, the age of latest event falls in the range 1811–2301 BP. The study is being led by GNS earthquake geologist Dr Russ Van Dissen. The continuation of this feature is … The 065 0 trend of the newly mapped These two strands continue to within about 15 km of the coast near Renwick. There are major fault lines running the length of New Zealand. The Wairau Fault links up with the Alpine Fault near the Nelson Lakes it extends for about 140 kilometres, he says. The Alpine, Wairau, and Hope faults ... TECTONICS | HOPE FAULT | ALPINE FAULT | WAIRAU FAULT | FAULTING | RATES | DEFORMATION. The Wairau Fault is the continuation of the Alpine Fault and in terms of the total dextral displacement of 500 km we suggest that up to 1 Myr ago the line of extension was along the North Island Shear Belt. It takes its name from the Wairau River, which follows the fault trace for most of its length.It has an estimated slip-rate of 3–5 mm/yr. The information collected and presented in this report and accompanying maps and documents by the Consultant and supplied to Marlborough District Council is We’ve known about the Alpine Fault for 80+ years, but there is still so much to learn. The Alpine Fault is believed to align with the Macquarie Fault Zone in the Puysegur Trench off the southwestern corner of the South Island. Tags from this library: No tags from this library for this title. From the offset of dated river terraces a displacement of 23 m has been estimated along the Wairau Fault since about 5610 yrs BP. Details for: The Alpine, Wairau, and Hope faults; Normal view MARC view ISBD view. Clearly a zone of violent contact, Marlborough continues to experience frequent tectonic changes along major fault lines. ... Blenheim's Wairau Hospital will likely … A rupture could cause a similar level of damage as the Napier earthquake in 1931 or Darfield in 2010. The Wairau Fault is an active dextral (right lateral) strike-slip fault in the northeastern part of South Island, New Zealand. The effects of glaciation can be seen around Nelson Lakes. “And through that we hope to build up a better knowledge, testing our ideas, does the shape of these scratch marks really indicate did the rupture come towards you? “It’s important because it points either towards or away from Wellington and that could have a significant impact on the level of ground shaking in the next earthquake.” [2], "Paleoseismology and slip rate of the Conway Segment of the Hope Fault at Greenburn Stream, South Island, New Zealand", "Timing of late Holocene surface rupture of the Wairau Fault, Marlborough, New Zealand", https://en.wikipedia.org/w/index.php?title=Wairau_Fault&oldid=795357421, Creative Commons Attribution-ShareAlike License, This page was last edited on 13 August 2017, at 18:47. From there, the Alpine Fault runs along the western edge of the Southern Alps, before splitting into a set of smaller dextral strike-slip faults north of Arthur’s Pass, known as the Marlborough Fault System. The pattern of the rock structure north of the Fault in Marlborough is mirrored on … La faglia alpina è una faglia trasforme a scorrimento laterale destro lunga circa 850 km che corre attraverso l'intera lunghezza dell'Isola del Sud, in Nuova Zelanda.La faglie forma un margine trasforme tra la placca pacifica e la placca indo-australiana.I terremoti lungo la faglia e i movimenti terrestri ad essi associati hanno portato alla formazione delle Alpi meridionali. They were metres long and they had a curve to them which looked like a lazy rainbow. At its northern end near Rotoiti, Nelson Lakes the Alpine Fault links with the Wairau Fault, which extends 140km along the Wairau Valley to the Marlborough coast. From there, the Alpine Fault runs along the western edge of the Southern Alps, before splitting into a set of smaller dextral strike-slip faults north of Arthur’s Pass, known as the Marlborough Fault System. It forms part of the Marlborough Fault System, which accommodates the transfer of displacement along the oblique convergent boundary between the Indo-Australian Plate and Pacific Plate, from the transform Alpine Fault to the Hikurangi Trench subduction zone.[1]. The Alpine Fault can be seen in the Wairau Valley, between Blenheim and Nelson Lakes. [Chapter Break] After their ground­breaking paper on the Alpine Fault, Willett was posted to Invercargill and Wellman to another war­time project at d’Urville Island. Detailed paleoseismic investigation of the Alpine Fault has been undertaken at four locations that bracket the north and Wairau sections, between the Blue Grey River and Tophouse Saddle. The Wairau Fault is an active dextral (right lateral) strike-slip fault in the northeastern part of South Island, New Zealand.It forms part of the Marlborough Fault System, which accommodates the transfer of displacement along the oblique convergent boundary between the Indo-Australian Plate and Pacific Plate, from the transform Alpine Fault to the Hikurangi Trench subduction zone. Marlborough District Active Fault Identification March 2003 Wairau section of the Alpine Fault. To the west, the fault is a single strand but near Wairau Valley township, the fault splits into two strands. [2] The current estimated seismic hazard from the Wairau Fault is considered to be relatively high. To the southwest on the southern Alpine Fault, the fault plane maintains a ~052° strike, but its dip steepens to 80°–90° southeast. Alpine Fault or Alpine Fault Zone, as used in this paper, will refer to the well established fault of this name and its most probable continuation as the Wairau Fault to the north (Fig. The derived isostatic anomalies reveal only minor gravity variations in the vicinity of the fault. This set of faults, which includes the Wairau Fault, the Hope Fault, the Awatere Fault, and the Clarence Fault, transfer displacement between the Alpine Fault and the Hikurangi subduction zone to the north. The Wairau Fault is an active dextral (right lateral) strike-slip fault in the northeastern part of South Island, New Zealand.It forms part of the Marlborough Fault System, which accommodates the transfer of displacement along the oblique convergent boundary between the Indo-Australian Plate and Pacific Plate, from the transform Alpine Fault to the Hikurangi Trench subduction zone. Geological maps of New Zealand can be obtained from the New Zealand Institute of Geological and Nuclear Science (GNS Science), a New Zealand Government Research Institute. The most spectacular is the Alpine Fault, where the Southern Alps are being uplifted. “It’s mainly a sideways slipping fault, the scratch marks look like lazy rainbows. The Wairau Fault links up with the Alpine Fault near the Nelson Lakes it extends for about 140 kilometres, he says. “If the Wairau Fault moves, Wellington’s going to be shaken, but we want to go past that and say it will be stronger than expected or weaker than expected for this fault line and that will enable, hopefully, the engineers to design more appropriately to achieve better performance objectives.”. “Meaning having things be operable after the earthquake, more easily repaired, less damaged, less costly to repair. Oggcast (Vorbis). [2] It takes its name from the Wairau River, which follows the fault trace for most of its length. This active fault trace enters the district in the Upper Wairau Valley, near Tophouse Saddle, and forms a discontinuous surface fault trace virtually all the way to Renwick. It's no surprise to most of us that New Zealand is perched on top of a collection of fault lines. Yetton, M. D. December 2003 (further amended 2005). The Wairau Fault, and faults nearby, is the subject of a new study gearing up to try and properly understand it, and what might happen if it ruptures. He hopes the study will have direct applications for building codes – moving beyond human safety to more resilient buildings.

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