It may have been responsible for a moderate earthquake that shook the city in 1869. 3). Even from a … Canterbury. The Alpine Fault creates the earthquake by the opposite sides rubbing against each other after tension has built up between the two. 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 worst-affected areas if the Alpine Fault were to rupture have been revealed. 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. Our scientific understanding concerning the next large earthquake on the Alpine Fault, New Zealand. 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. Even from a distance they are quite disconcerting. Despite catastrophic damage in the city, its area of impact was about 50km. South of Ross, effectively all 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. Ground shaking intensities in Christchurch during an Alpine Fault earthquake will be high enough to cause liquefaction. Central, northern and northeastern Christchurch have also gone down, but generally by less than 5 centimetres. Christchurch Earthquake. 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. The Alpine Fault can produce magnitude 8 earthquakes and does so about every 300 to 350 years. Written by Geoff Chapple ISSUE 125 An Alpine Fault rupture could produce one of the most destructive earthquakes since European settlement of New Zealand because of its geologic characteristics. 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. All these cities have experienced severe earthquakes since European settlement. The white line is the contour where there was no change in height. 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. 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. At 3 AM on May 29, 2013, the South Island’s technological uncon­scious roars […] 1) was about 14 kilometres long, and extends east-northeast from Cashmere to the Avon-Heathcote estuary area. Response spectra are very useful tools for analysing the seismic performance of structures. 100% (1/1) B.W Mountfort. 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. 6 months on-repairs. 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. CTV building didn't meet. The Alpine Fault runs for about 600km up the spine of the South Island, and is one of the world’s major geological features. 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. Magnitude 8 or larger, geologists said in a special edition of the New Zealand Journal of Geology and Geophysics last year. In between earthquakes, the Alpine Fault is locked. and 1.2 seconds. The main part of the fault thus lies beneath the northern edge of the Port Hills. Radar images taken from satellites before and after the earthquake were analysed. Figure 3: Image indicating ground displacement made by combining satellite radar images taken before and after the earthquake. 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. Photo: Getty Images. 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. 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 Greendale Fault is an active seismic fault in the middle of New Zealand's South Island. [1] The Southern Alps have been uplifted on the fault over the last 12 million years in a series of earthquakes. Such a duration is comparable to the duration observed in Christchurch from the 2010 Mw 7.1 Darfield earthquake. Scientists didn't know of. / Natural Hazards and Risks However the modelled PGA from an Alpine Fault event … The fault is a strike-slip boundary in which the Australian Plate and the Pacific plate are moving horizontally past each other. The Alpine Fault marks the boundary of the Pacific and Australian Plates. The Alpine Fault, running up the South Island, has an earthquake nearly every 300 years. Chris J. The greatest movement was upward and toward the northwest under the Avon-Heathcote estuary 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. An earthquake early-warning system is conceivable for the South Island alpine fault and could give people 30 seconds to get out of buildings. Home When the Alpine Fault next ruptures it is likely to produce an earthquake with a magnitude of around 8. 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. 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. 2). 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. / Canterbury quake How often does the Alpine Fault rupture? Away from the main plate boundary faults there are many smaller faults throughout Canterbury. It will be centred roughly 60km west of Queenstown, in the South Westland area. The 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. 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