Alpine Fault outcrop showing banded cataclasite and breccia, Waikukupa River. As the Australian… Based on this research, scientists have estimated there is a 30% probability of a large earthquake on the Alpine Fault in the next 50 years. In the central South Island, the Alpine Fault is dextral-re-verse and bounds the western edge of the Southern Alps (Norris et al., 1990). Generally the fault has a simple straight trace, striking ca. Alpine Fault identifies earthquakes in the years 1717, 1620, and 1430, with estimated moment magnitudes of 7.9±0.3, 7.6±0.3, and 7.9±0.4, respectively (Sutherland et al., 2007). Between 23 and 10 million years ago the western side of the Alpine Fault was moving northeast relative to the eastern side at a rate of between 1-10 cm per year. The Structural Geology of the Alpine Fault . Alpine orogeny, mountain-building event that affected a broad segment of southern Europe and the Mediterranean region during the Paleogene and Neogene periods (65.5 million to 2.6 million years ago). 2. Trenches were excavated across the Alpine Fault trace at Haast to determine recent past earthquakes which have accompanied surface rupture and displacement on the fault. The Alpine Fault forms part of the on-land Pacific-Australian plate boundary. The Alpine Fault has moved much more than previously thought, and more than any other known fault on land in the world, new research shows. [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. The Alpine Fault is a geological fault that runs entirely through New Zealand's South Island.It forms a boundary between the Pacific Plate and the Indo-Australian Plate. The Alps form part of a Cenozoic orogenic belt of mountain chains, called the Alpide belt, that stretches through southern Europe and Asia from the Atlantic all the way to the Himalayas.This belt of mountain chains was formed during the Alpine orogeny.A gap in these mountain chains in central Europe separates the Alps from the … Clay mineral formation and fabric development in the DFDP-1B borehole, central Alpine Fault, New Zealand. Between 25 and 12 million years ago the movement on the proto-Alpine Fault was exclusively strike-slip. Earthquakes along the fault, and the associated earth movements, have formed the Southern Alps.The uplift to the southeast of the fault … (i) Remnants of shore platforms occur as distinct levels of notched ridge crests and flat summits; degraded sea cliffs are common. Laser-ablation 40 Ar/ 39 Ar step-heating analyses of 20 pseudotachylyte veins from a single location along the exhumed central portion of the active Alpine fault of New Zealand yield total gas age values between 1 and 19 Ma. The Alpine orogeny produced intense metamorphism of preexisting rocks, crumpling of rock strata, New Zealand Journal of Geology and Geophysics: Vol. The total uplift in the Aoraki/Mt Cook region during the past two to three million years could be as much as 20,000 metres. Mt. Our Knowledge of the Alpine Fault . The creation of the Alps was an internal process caused by the collision of the Australian and Pacific tectonic plates. Alteration Along the Alpine Fault Helps Build Seismic Strain . The Alpine Fault is a ~900 km-long, active Australian-Pacific plate boundary structure, which accommodates up to 70–90% of total plate boundary motion across the South Island of New Zealand. St. Helens formed in a subduction zone. Recent excavations across the fault trace here have provided clear evidence for three earthquakes since the terrace surface formed, each having about 8m of horizontal displacement. 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. The Southern Alps were created during a time of huge uplift which has been called the Kaikoura Orogeny. Geometrical analysis enables an estimation of 450–1650 m of dextral displacement on the Alpine Fault at the releasing bend since the development of an unconformity estimated to have formed at between 30 and 110 ka. 4. The Alpine Fault is one of the world's major plate boundaries and New Zealand's most hazardous earthquake-generating fault. This implies a dextral slip rate ranging from a possible minimum of 4 mm/yr to the maximum of 35 mm/yr … At 3 AM on May 29, 2013, the South Island’s technological … The orientations of intrusive rocks from a carbonatitic lamprophyre dike swarm and the history of emplacement relative to country-rock schist structures are compatible with intrusion into tension fractures and Riedel shears formed during initiation of the dextral wrench system of the Alpine fault. A transform fault is a type of strike-slip fault at the boundary of two 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 Alpine Fault principal slip plane lies at the base of the distinctive mint-green cataclasites, and exhumes a kilometre-wide hanging-wall sequence of mylonites formed at depth. Alpine Fault. The Alpine Fault ruptures—on average—every 330 years with a magnitude 8 earthquake. The Alpine fault does not have volcanic activity. A view of Aoraki (Mount Cook) in the Southern Alps of New Zealand, still on the rise due to the Alpine Fault. Earthquakes along the fault have formed the Southern Alps Evidence shows that they are genetically related and were formed during coeval episodes of seismogenic … The Alpine Fault, which is visible from space, extends for about 650km from south of Fiordland along the spine of the Southern Alps and into Marlborough. (ii) Scattered quartz beach pebbles occur on 16 of 18 levels of exhumed shore platforms in the … Future Earthquake Predictions. This is why Palaeozoic rock belts in Nelson match reasonably well with those to the south in … [5] 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. Geologists and authorities are racing to quantify what might happen, and how they might respond in the event of the next one, likely to occur some time in the next 50 years. Front page photograph: The Alpine Fault at Inchbonnie – Hohonus and Taramakau River looking east [L.Homer, GNS] M Trayes, Natural Hazards Analyst West Coast Regional Council February 20 12 However, this study has shown that for faults similar to the Alpine Fault, a fairly regularly repeating earthquake cycle is a realistic foundation on which to base earthquake hazard estimates. (2015). Date/Time Date(s) - Fri 3 November 16:00 - 17:00. 25 to 15 million years ago the majority of New Zealand was covered by the ocean. 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