and so willsend any waves overseas! The Alpine Fault runs for about 600km up the spine of the South Island, and is one of the world’s major geological features. Away from the main plate boundary faults there are many smaller faults throughout Canterbury. However, there may be additional subsidence as a result of ground compaction and liquefaction during the strong shaking. 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. Such a duration is comparable to the duration observed in Christchurch from the 2010 Mw 7.1 Darfield earthquake. South of Ross, effectively all In fact, the Alpine Fault, which runs for about 600 kilometers through the South Island, suffered major eruptions in 1717, 1620, 1450, and 1100. Scientists didn't know of. 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 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. An Alpine Fault rupture … Benjamin Mountfort. The Mw 6.2 Christchurch Earthquake of 22 February 2011 7 . The September 4 earthquake, however, did not occur on the Alpine Fault. The rarest is from a major rupture of the Alpine Fault – around a magnitude 8 event. For processing of the radar data: Mahdi Motagh. Our scientific understanding concerning the next large earthquake on the Alpine Fault, New Zealand. Chris J. 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 … The faults are identifiable by the way they deform the ground. Radar images taken from satellites before and after the earthquake were analysed. 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. The land has gone up as much as 40 centimetres around the western side of the Avon-Heathcote estuary. “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. Earthquake hits South Island's Alpine Fault; How large? 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. the Farmy Army-800 farmers with machines. Sure the Alpine will noot be acake walk for many. The 2004 Boxing Day tsunami and the 2011 liquefaction of buildings in Christchurch … The main part of the fault thus lies beneath the northern edge of the Port Hills. This raised part of the Port Hills and part of southern Christchurch. [1], The Christchurch fault is believed to have been responsible for a series of earthquakes that rocked the city on Boxing Day of 2010. Even from a distance they are quite disconcerting. 1) was about 14 kilometres long, and extends east-northeast from Cashmere to the Avon-Heathcote estuary area. The fault is a strike-slip boundary in which the Australian Plate and the Pacific plate are moving horizontally past each other. It runs from an area close to Riccarton, under the Central City, through the eastern suburbs off the coast of New Brighton. Several faults are scattered across New Zealand’s South Island, and all are associated with the motion of the two tectonic plates. It will be centred roughly 60km west of Queenstown, in the South Westland area. The 2011 Christchurch earthquake, for example, was the result of a 16km fault rupture. 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). 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. An earthquake early-warning system is conceivable for the South Island alpine fault and could give people 30 seconds to get out of buildings. electricity returned to 75% of the city. It runs parallel to the more destructive Port Hills Fault that lies 5 km to the south of the Christchurch Fault. The red, green and yellow coloured symbols show some of the GPS stations whose displacements were used to derive the fault slip model. 30,000. 3). In between earthquakes, the Alpine Fault is locked. $5 million. 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. It will be centred roughly 60km west of Queenstown, in the South Westland area. 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. 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. The Christchurch Fault is an active seismic fault running under the city of Christchurch in the middle of New Zealand's South Island . Figure 1: This Google map image shows the fault plane (rectangular area) across the southern part of Christchurch and northern Port Hills. 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. 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 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. 50-100 years to completely recover. Thherewill be no Tsunami in nz if the Alpine goes as it is a *Landbased* fault line. At 3 AM on May 29, 2013, the South Island’s technological uncon­scious roars […] Over the next few seconds the rupture spread upwards and towards the northwest, with the amount of slip increasing with time. Running through the heart of New Zealand's glacier country is the infamous Alpine Fault. A number of techniques were used to determine the fault’s position and movement. Duration: 10min … 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. 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. A rupture of the fault was therefore considered inevitable, with severe damage predicted to the built environment - especially to infrastructure. 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. 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. 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. Even from a … Position data from GPS stations (Fig. 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. Such a duration is comparable to the duration observed in Christchurch from the 2010 M27.1 Darfield earthquake. 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 … Many Cantabrians and others in the central South Island, had assumed that because the Alpine Fault was more than 100km away shaking would not be strong, even in a large earthquake, he said. and 1.2 seconds. Both Dunedin and Christchurch are likely to experience shaking and liquefaction in low-lying areas,” Dr. Orchiston said. 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. The fault rupture started with a small amount of slip between the two sides of the fault at about 6 km depth. Ground shaking intensities in Christchurch during an Alpine Fault earthquake will be high enough to cause liquefaction. 2). 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