It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton. 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. Figure 3: Image indicating ground displacement made by combining satellite radar images taken before and after the earthquake. It is possible that a large Alpine Fault earthquake could also rupture the western part of some faults of the Marlborough Fault … This type of fault motion is called reverse faulting. 100% (1/1) B.W Mountfort. Earthquake hits South Island's Alpine Fault; How large? 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. 50-100 years to completely recover. The Alpine Fault ruptures—on average—every 330 years with a magnitude 8 earthquake. Within 3 days... 80% of roads and 50% of footpaths were repaired. The Christchurch Fault is an active seismic fault running under the city of Christchurch in the middle of New Zealand's South Island. Our scientific understanding concerning the next large earthquake on the Alpine Fault, New Zealand. distributed on faults within the Southern Alps and the remaining 5% (approximately) on faults within a broader region beneath the Canterbury Plains (Wallace et al., 2007). 30,000. I felt the next Christchurch quake (22 February) while at work, and a few aftershocks as well. Synthetic ground motions from the broadband simulations are generally consistent with PGAs estimated from GMPEs. Written by Geoff Chapple ISSUE 125 Mark Horstman heads to earthquake-ravaged Christchurch and meets the seismologists who are investigating the fault line that caused the damage. However the modelled PGA from an Alpine Fault event … 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. electricity returned to 75% of the city. 3). Several faults are scattered across New Zealand’s South Island, and all are associated with the motion of the two tectonic plates. The red star shows the location where the fault rupture started. Just after midday on the 22 nd of February 2011, a magnitude 6.3 earthquake struck Christchurch, resulting in 185 deaths.. Seismologist Bill Fry, who is also part of the Resilience to Nature’s Challenges National Science Challenge, was on earthquake duty at GeoNet that day. 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. 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. Compulsory READ: ALPINE FAULT RUPTURE: FACTS Page 3 / 5. fepixie, Jan 29, 11:38pm. Scientists didn't know of. It will be centred roughly 60km west of Queenstown, in the South Westland area. 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. Sure the Alpine will noot be acake walk for many. 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. 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. Even from a … The general region of fault slip is outlined by the aftershocks of the 22 February 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. The hidden fault that caused the February 2011 Christchurch earthquake. The September 4 earthquake, however, did not occur on the Alpine Fault. The 3.24am quake was 5km deep and reported by more than 600 people around Queenstown and Wanaka. / Natural Hazards and Risks 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. 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. It was part of a swarm of tremors around Milford … The greatest movement was upward and toward the northwest under the Avon-Heathcote estuary area. 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. However, there may be additional subsidence as a result of ground compaction and liquefaction during the strong shaking. The Alpine Fault, running up the South Island, has an earthquake nearly every 300 years. There is still additional work to do to locate these aftershocks precisely, at which time they may provide additional detail on the fault rupture. "New Zealand has excellent earthquake standards in its building codes, but those standards were much more stringent on the Alpine fault to the west of Christchurch … Share. Christchurch Earthquake. The white line is the contour where there was no change in height. This is called a ‘Transform boundary’. Position data from GPS stations (Fig. 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. 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. 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). 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 … The suburbs of Heathcote and Redcliffs lie above the fault, resulting in heavy damage and extensive rockfalls. In 1873 a new resident architect, New Zealander Benjamin Mountfort, took over and construction began again. Duration: 10min … 1931 Hawke's Bay earthquake 2011 Christchurch earthquake Alpine Fault ChristChurch Cathedral Volcanology of New Zealand. 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. $5 million. 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 Darfield earthquake had a magnitude of M7.1. 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). Such a duration is comparable to the duration observed in Christchurch from the 2010 Mw 7.1 Darfield earthquake. The fault is not a vertical cut through the earth, but rather it dips towards the south at an angle of about 65 degrees from the horizontal. 0 Comments. The fault, which runs about 600km up the western side of the South Island, poses one of the biggest natural threats to New Zealand. Hirat lies close to the Hari Rud fault, but because of this fault’s low slip rate, large earthquakes are infrequent. It comes after scientists claimed the Alpine Fault is overdue for an earthquake that could reshape the South Island. 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. An earthquake early-warning system is conceivable for the South Island alpine fault and could give people 30 seconds to get out of buildings. Canterbury earthquake. Central, northern and northeastern Christchurch have also gone down, but generally by less than 5 centimetres. 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. 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. It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton. The largest city within the highest-risk zone is the nation's capital, Wellington, followed by Hastings then Napier. Based on data from GPS stations, satellite radar images, seismographs and strong-motion recorders, the fault that caused the 22 February earthquake lies within about six kilometres of the city centre, along the southern edge of the city. “I thought we’d dodged a bullet with the Darfield earthquake,” says Bill. and 1.2 seconds. 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. "Christchurch has never been identified as a major earthquake zone, because no one knew this fault ran beneath," says a seismologist at the British Geological Survey. Both Dunedin and Christchurch are likely to experience shaking and liquefaction in low-lying areas,” Dr. Orchiston said. 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 Alpine Fault runs northeast from the northern side of the entrance to Milford Sound, through the mountains behind Martins Bay, along the coast beneath the Southern Alps to … Each colour cycle represents 1.5 centimetres of ground displacement, so the total displacement between the western edge of the image and central Christchurch is about 25 centimetres. The fault plane extends a few kilometres offshore, but not much fault movement occurred beneath the ocean. Colours on the fault plane indicate the amount of slip between the two sides of the fault (see Fig. Running through the heart of New Zealand’s glacier country is the infamous Alpine Fault. Canterbury. 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. The Alpine Fault ruptures—on average—every 330 years with a magnitude 8 earthquake. It runs virtually the whole length of the West Coast Region, with the high mountains to its east and the lower hill lands and alluvial flats to its west. 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. 1) was about 14 kilometres long, and extends east-northeast from Cashmere to the Avon-Heathcote estuary area. Movement was modelled using the ground shaking recorded during the earthquake by “strong-motion” seismometers. Queenstown residents were woken up early on Sunday morning by a relatively shallow magnitude 5.5 tremor, centred just northeast of Milford Sound on the Alpine Fault. In fact, the Alpine Fault, which runs for about 600 kilometers through the South Island, suffered major eruptions in 1717, 1620, 1450, and 1100. The next major rupture of the South Island's Alpine Fault will be one of the largest - if not the biggest - earthquake Kiwis have ever experienced. In fact, the Alpine Fault, which runs for about 600 kilometers through the South Island, suffered major eruptions in 1717, 1620, 1450, and 1100. The Canterbury Plains could suffer more damage in an Alpine Fault quake than some areas closer to the fault, say researchers - and it is not alone. / Hidden fault. [1], The Christchurch fault is believed to have been responsible for a series of earthquakes that rocked the city on Boxing Day of 2010. / Our Science The nearest fault, the Alpine Fault, lies many hundreds of miles to the west, in — as the name suggests — the Southern Alps. “Just because we didn’t see it in that earthquake in the past, doesn’t mean we won’t see it in the future.” He applies the same caution to the next likely rupture of New Zealand’s largest fault, the Alpine Fault. It will be centred roughly 60km west of Queenstown, in the South Westland area. 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. The Alpine Fault can produce magnitude 8 earthquakes and does so about every 300 to 350 years. Chris J. Waimakariri District Council media release: 10th November 2020. Earthquakes happen when a fault suddenly breaks. Regional planning workshops are being held in each South Island region and once they are completed in April, a coordinated South Island Alpine Fault Earthquake (SAFER) Plan will be developed. 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 last earthquake on the Alpine Fault was in 1717. 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 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. 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. / Canterbury quake / Recent Events Ground shaking intensities in Christchurch during an Alpine Fault earthquake will be high enough to cause liquefaction. The fault rupture (Fig. 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. tectonic plates, approximately 75%, is taken up on the Alpine Fault, approximately 20% . Even from a distance they are quite disconcerting. The Christchurch Fault is an active seismic fault running under the city of Christchurch in the middle of New Zealand's South Island . The Because the fault doesn’t break the surface, the land overlying the top of the fault has been slightly folded, with the south side warped upward and the north side down (see Fig. These four short videos explain why we are taking the Alpine Fault so seriously and help you understand how you can be prepared for the disruption to normal life that a severe earthquake will cause. There are three major known earthquake threat sources to Christchurch – and although all differ in their magnitude and distance from the city, all are expected to result in around the same amount of ground shaking. 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 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. However, the plates are locked and when they overcome these barriers, they produce large but … Magnitude 8 or larger, geologists said in a special edition of the New Zealand Journal of Geology and Geophysics last year. 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. In terms of the way the previous material has been set out in this resource, and because there is so much available about the Alpine Fault, it has been decided to treat material about … For CSK satellite radar data: e-GEOS, an ASI/Telespazio company, especially Andrea Celentano. 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