* Alpine Fault moves more than any other fault in the world * Alpine Fault spreads across South Island, researchers say * When, not if: Alpine fault could cause 8 metres of movement. It would make Christchurch's earthquake look like an airsoft pistol at a machine gun convention. Geologists working on Project AF8 believe that the next severe earthquake on the Alpine Fault is most likely to be a rupture that begins in South Westland and “unzips” northwards and will … Would it trigger faults to rupture here? Our findings, published today in Nature, describe these surprising underground conditions. The effect of fluid differentials on an Alpine Fault earthquake is obviously significant but presently unquantified. It is hard to imagine how spectacularly bad this would be for Wellington.  The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. A big quake on the Alpine Fault could block South Island highways in more than 120 places and leave 10,000 people cut off, new research has estimated. ... We don't know exactly what effect the Kaikoura earthquake had on the Alpine Fault, but it's likely too far away to have had any significant effect. Evidence for Alpine Fault Creep at the Surface. Historical Seismicity. Evidence for Ancient Alpine Fault Earthquakes. AF8 is focused on planning for this event in the South Island, but some North Island CDEM groups are also taking the Alpine Fault into account in their planning. High Heat Flow and Geothermal Gradient. The lack of moderate or large-magnitude earthquakes on the Alpine fault since reliable record keeping started means that the seismic potential of the Alpine fault must be inferred from indirect
Discussion: Alpine Fault Rupture Mechanisms. the Alpine fault in central South Island than at any other part of the plate boundary through New Zealand [Evison, 1971; Eberhart-Phillips, 1995]. But even then, … The The rupture will produce one of the biggest earthquakes since European settlement of New Zealand, and it will have a major impact on the lives of many people. The Alpine Fault has a high probability (estimated at 30%) of rupturing in the next 50 years. When the Alpine Fault goes, and, surmising it is a sub-8 rupture, what would the effect be on buildings and soil in Christchurch? and so willsend any waves overseas! Bear in mind an M8 easily has the potential to cause the two sides of the fault to permanently move up to 4 metres vertically and 8 metres horizontally. Where will the next earthquake centred on the Alpine Fault begin? By Rupert Sutherland, Victoria University of Wellington An international team that drilled almost a kilometre deep into New Zealand’s Alpine Fault, which is expected to rupture in a major earthquake in the next decades, has found extremely hot temperatures and high fluid pressures. Whenever a large quake happens in the South Island, the immediate thought is either "That was Wellington, or, That was the Alpine Fault." Alpine Fault. The Wellington Fault is an active seismic fault in the southern part of the North Island of New Zealand.It is a dextral (right-lateral) strike-slip fault with variable amounts of vertical movement causing uplift to the northwest, as expressed by a series of ranges. The 2012 paper suggests simply that fault zones are sites of high fluid pressure gradient, and that “dynamic pressurisation likely promotes earthquake slip.” Stage two of the deep-drilling programme is scheduled for 2014. The synthetic records show that ground motion accelerations in Greymouth and Hokitika are expected to exceed 20%g and 50%g respectively during an Alpine fault earthquake, while ground motions in Christchurch are expected to be moderate, with peak ground accelerations (PGAs) of 8%g expected from an Alpine event and 6%g from a Hope fault event. Sure the Alpine will noot be acake walk for many. Alpine Fault Locking Inferred from Geodetic Data.
The lengthy Alpine Fault, which runs along the spine of the Southern Alps, has garnered much attention as it has a clear geographic record of rupturing every 300 years or so. In between earthquakes, the Alpine Fault is locked. All these things mean that the Alpine Fault is a globally significant geological structure. Alpine Fault Unzipping. A team of experts has been tasked with creating an action plan for an Alpine Fault mega-quake, thought to be due within the next 60 years.