AcknowledgementsFor discussions and sharing of early results: Pierre Briole, ENS, France; Marcello de Michele, BRGM, France; Eric Fielding, JPL, USA; SARmap group, Switzerland; INGV, Italy; GSI, Japan; Shaun Levick, Caroline Holden, Bill Fry, Stephen Bannister, Martin Reyners, all at GNS. The Alpine Fault marks the boundary of the Pacific and Australian Plates. In September 2010, Christchurch was shaken by the magnitude 7.1 Darfield earthquake, caused by movement along faults west of the city on the Canterbury Plains. In September 2010, Christchurch was shaken by the magnitude 7.1 Darfield earthquake, caused by movement along faults west of the city on the Canterbury Plains. A number of techniques were used to determine the fault’s position and movement. the Farmy Army-800 farmers with machines. construction standards. This was one of the main faults that caused the Canterbury earthquake of 2010. North Canterbury residents will have a chance to hear from leading natural hazard scientist, Professor Tom Wilson of University Of Canterbury about the impacts and consequences of a future magnitude 8 earthquake along the Alpine Fault, and how people can become better prepared for it. Relative to the fault, the land north of the fault shifted eastward while the land to the south of the fault shifted westward. The contour lines indicate the amount (in mm) the land has risen (blue contours) or subsided (red contours) due to the slip on the fault. The suburbs of Heathcote and Redcliffs lie above the fault, resulting in heavy damage and extensive rockfalls. The duration of shaking is expected to last over 3 minutes for an Alpine fault earthquake and at least 20 seconds for a Hope fault earthquake. / Canterbury quake The hidden fault that caused the February 2011 Christchurch earthquake. However, the violent magnitude 6.3 earthquake that devastated Christchurch on 22 February 2011 was caused by movement along a fault that does not appear to have broken the surface. Benjamin Mountfort. The greatest movement was upward and toward the northwest under the Avon-Heathcote estuary area. 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. 30,000. [2], "Second Christchurch fault much better behaved", https://en.wikipedia.org/w/index.php?title=Christchurch_Fault&oldid=944155164, Creative Commons Attribution-ShareAlike License, This page was last edited on 6 March 2020, at 02:08. Away from the main plate boundary faults there are many smaller faults throughout Canterbury. Home The 2020 New Zealand Earthquake (pronounced "TWENTY-TWENTY", also known as the Alpine Fault Quake and the 2020 South Island Quake) is a magnitude 8.7 earthquake that will occur on the Alpine Fault in New Zealand's South Island at 11:31 (local) on Thursday, June 18th, 2020. The Running through the heart of New Zealand’s glacier country is the infamous Alpine Fault. Position data from GPS stations (Fig. An Alpine Fault rupture could produce one of the most destructive earthquakes since European settlement of New Zealand because of its geologic characteristics. The coloured image shows an “interference pattern” derived from X-band radar images taken on 19 and 23 February 2011 by the Italian Cosmo-SkyMed satellite. Sure the Alpine will noot be acake walk for many. Presentation given in Christchurch in March 2015. In 1873 a new resident architect, New Zealander Benjamin Mountfort, took over and construction began again. The rarest is from a major rupture of the Alpine Fault – around a magnitude 8 event. It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton. The 3.24am quake was 5km deep and reported by more than 600 people around Queenstown and Wanaka. For CSK satellite radar data: e-GEOS, an ASI/Telespazio company, especially Andrea Celentano. Both earthquakes were less than 50 km from the Christchurch central business area and had a magnitude that is much smaller than that expected from the Alpine fault (Mw=8.2) and that is similar to a potential Hope fault event (Mw7+). The Port Hills have gone up by varying amounts, from about 5 centimetres under Lyttelton Harbour to a maximum of about 25 centimetres at the base of the hills near the Heathcote valley. Central, northern and northeastern Christchurch have also gone down, but generally by less than 5 centimetres. “I thought we’d dodged a bullet with the Darfield earthquake,” says Bill. 1931 Hawke's Bay earthquake 2011 Christchurch earthquake Alpine Fault ChristChurch Cathedral Volcanology of New Zealand. This video shows another validation case to test our Bullet Constraints Builder add-on for Blender with as part of our research. In between earthquakes, the Alpine Fault is locked. / Recent Events At 3 AM on May 29, 2013, the South Island’s technological uncon­scious roars […] In the line of fire is the small town of Franz Josef, just 5 kilometers (3 miles) from the often-visited Franz Josef glacier in … The fault, which runs about 600km up the western side of the South Island, poses one of the biggest natural threats to New Zealand. [1] The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. This article describes our understanding of the Christchurch earthquake fault as at the 8th of April, about 7 weeks after the earthquake. 1) before and after the earthquake was analysed, using measurements from both existing continuous GPS stations and temporary stations installed after the earthquake. This earthquake produced a visible rent across the landscape that allowed scientists to directly measure the movement of the longest fault segment, the Greendale Fault. When I woke up to feel the first Christchurch earthquake (4 September 2010) my first thought after WTF was whether it was ‘the big one’ expected some time on the Alpine Fault. Duration: 10min … The nearest fault, the Alpine Fault, lies many hundreds of miles to the west, in — as the name suggests — the Southern Alps. Written by Geoff Chapple ISSUE 125 When I woke up to feel the first Christchurch earthquake (4 September 2010) my first thought after WTF was whether it was ‘the big one’ expected some time on the Alpine Fault. The last earthquake on the Alpine Fault was in 1717. Response spectra are very useful tools for analysing the seismic performance of structures. The main part of the fault thus lies beneath the northern edge of the Port Hills. It will be centred roughly 60km west of Queenstown, in the South Westland area. When I woke up to feel the first Christchurch earthquake (4 September 2010) my first thought after WTF was whether it was ‘the big one’ expected some time on the Alpine Fault. The Alpine Fault ruptures—on average—every 330 years with a magnitude 8 earthquake. The Greendale Fault is an active seismic fault in the middle of New Zealand's South Island. / Hidden fault. The Alpine Fault, running up the South Island, has an earthquake nearly every 300 years. but wholesale death and destruction isunlikely, any links( no matter who they are from) is onlyconjection, not truth, as you said in other thread how many geologists/scientists were around to prove what they say is true. The rock on the south side of the fault has moved up and westward by as much as 2.5 metres relative to the rock on the north side of the fault. The images can be combined to show the total amount of shift of the ground surface, both vertically and horizontally, caused by the earthquake (see Fig. However, the plates are locked and when they overcome these barriers, they produce large but … [1], The Christchurch fault is believed to have been responsible for a series of earthquakes that rocked the city on Boxing Day of 2010. The faults are identifiable by the way they deform the ground. The earthquakes on the Alpine Fault occurred at different times to the earthquakes on the southern Hikurangi Trench, showing that they were not one continuous earthquake rupture. Christchurch earthquakes of 2010–11 …and near the city of Christchurch, New Zealand, and the Canterbury Plains region from early September 2010 to late December 2011. This type of fault motion is called reverse faulting. Thherewill be no Tsunami in nz if the Alpine goes as it is a *Landbased* fault line. Magnitude 8 or larger, geologists said in a special edition of the New Zealand Journal of Geology and Geophysics last year. Synthetic ground motions from the broadband simulations are generally consistent with PGAs estimated from GMPEs. The red, green and yellow coloured symbols show some of the GPS stations whose displacements were used to derive the fault slip model. It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton. The deeper parts of the fault, and the westernmost 5 to 6 kilometres of the fault slipped predominantly horizontally by a few tens of centimetres. Domestic help from . Now we do. The last earthquake on the Alpine Fault was in 1717. Large earthquakes are less common along the central Alpine Fault, where the plates are not subducting and the forces are accommodated in different ways. The Alpine Fault creates the earthquake by the opposite sides rubbing against each other after tension has built up between the two. 3). Figure 1: This Google map image shows the fault plane (rectangular area) across the southern part of Christchurch and northern Port Hills. Just as the Kaikōura earthquake in 2016 had a significant impact on Wellington, we expect that when the Alpine Fault ruptures in a large magnitude earthquake it will be widely felt across the lower North Island. Both Dunedin and Christchurch are likely to experience shaking and liquefaction in low-lying areas,” Dr. Orchiston said. The block of land south of the fault slid up the fault surface by as much as 2.5 metres on the section of fault near the Avon-Heathcote estuary. As a direct result of the fault slip, the Bexley, Aranui, Wainoni, Avondale and New Brighton areas have gone down, mostly by less than 15 centimetres. The two plates meet at the Alpine Fault, which runs up the western edge of the Southern Alps, before splitting into four main faults through North Canterbury and Marlborough – the Wairau, Awatere, Clarence and Hope faults. Such a duration is comparable to the duration observed in Christchurch from the 2010 M27.1 Darfield earthquake. The duration of shaking is expected to last over 3 minutes for an Alpine Fault earthquake and at least 20 seconds for a Hope fault earthquake. Movement was modelled using the ground shaking recorded during the earthquake by “strong-motion” seismometers. 2 ALPINE FAULT EARTHQUAKE 2.1 Alpine Fault The Alpine Fault is the largest active fault in New Zealand and extends over 650km on land from Milford Sound to Blenheim. The fault rupture (Fig. 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. Kandahar, being located in south-eastern Afghanistan, is farther removed from tectonic movements in the northeast and is located well away from the Chaman fault, further decreasing its … Even from a distance they are quite disconcerting. 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. Such a duration is comparable to the duration observed in Christchurch from the 2010 Mw 7.1 Darfield earthquake. The top of the fault lies at a depth of about a kilometre beneath the surface, and the rupture extends down along the fault plane for about seven kilometres. The Alpine Fault ruptures—on average—every 330 years with a magnitude 8 earthquake. Brendon Bradley, professor in earthquake engineering at the University of Canterbury, has created a computer simulation of the likely impact of a magnitude 8 earthquake on the Alpine Fault. For GPS data: LINZ, especially Josh Thomas and Dave Collett; GeoNet; Geosystems/Trimble New Zealand; Global Survey; Andersen & Associates, especially Brent George; Christchurch City Council; Otago University. 6 months on-repairs. Scientists have thus had to rely on measurements using a variety of techniques and instruments to determine its location and the nature of its movement. The worst-affected areas if the Alpine Fault were to rupture have been revealed. Running through the heart of New Zealand's glacier country is the infamous Alpine Fault. The 600 kilometer-long (370 mile) faultline on the boundary of the Eurasian and Pacific tectonic plates beneath the country’s South Island produces infrequent but significant earthquakes. There is still additional work to do to locate these aftershocks precisely, at which time they may provide additional detail on the fault rupture. The Mw 6.2 Christchurch Earthquake of 22 February 2011 7 . 50-100 years to completely recover. Chemical toilets provided for. Mark Horstman heads to earthquake-ravaged Christchurch and meets the seismologists who are investigating the fault line that caused the damage. How often does the Alpine Fault rupture? Canterbury. The way in which the Christchurch earthquake happened was due to the vibration of the ‘Alpine fault’ line which runs for around 600 km through Christchurch (Science, Alpine Fault, 2017). Radar images taken from satellites before and after the earthquake were analysed. 1). The fault rupture started with a small amount of slip between the two sides of the fault at about 6 km depth. Fault slip comes to within one kilometre of the ground surface. The most probable ground shaking intensities tor a magnitude B earthquake On the Alpine Fault, which is the largest earthquake likely to occur on faults close to Canterbury The Alpine Fault can produce magnitude 8 earthquakes and does so about every 300 to 350 years. He said it gave the most detailed information yet about the sort of impact a major Alpine Fault earthquake would have on different parts of the South Island. Share. CTV building didn't meet. I felt the next Christchurch quake (22 February) while at work, and a few aftershocks as well. Even from a … The direction of movement—up and towards the northwest—focussed the energy of the earthquake towards Christchurch and helps explain the severe damage in the city. The fault is a strike-slip boundary in which the Australian Plate and the Pacific plate are moving horizontally past each other. The devastating earthquake that tore through Christchurch on Tuesday is the product of a new fault line in the Earth’s crust that seismologists were previously unaware of. When the Alpine Fault next ruptures it is likely to produce an earthquake with a magnitude of around 8. It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton.It runs parallel to the more destructive Port Hills Fault that lies 5 km to the south of the Christchurch Fault. Despite catastrophic damage in the city, its area of impact was about 50km. We expect that details of the fault location and slip distribution will be updated in the future, as we incorporate more data and use more sophisticated data analysis techniques. Slip of the Pacific plate are moving horizontally past each other after tension built. 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