The fault is not explicitly … The fault runs for about 20km onshore - between about Taieri Mouth and Toko Mouth - and possibly more than 40km offshore. The next Alpine Fault earthquake would likely also be a long-duration event – unzipping the crust for as much as three minutes - because of the sheer length of the fault. "The San Andreas Fault, being on the opposite side of the Pacific plate, it is like our distant brother or whanau—family," said Langridge. Kirilova, Martina Atanasova. These effects are covered in other papers within this special issue. It is clear from these results that the … T he science and impact of an earthquake on the Alpine Fault will be the topic of two workshops in the Mackenzie district next week. Therefore, almost all local trips and inter-district trips from these three districts will be cancelled. Only earthquakes with a magnitude of 6.0 or greater are listed, except for a few that had a moderate impact. After trenching along the fault at the Staples site near the Toaroha River, however, Robert Langridge of GNS Science and colleagues uncovered evidence of a more recent earthquake along the northeastern end of the fault's central portion. Your feedback will go directly to Science X editors. PHOTO: PROJECTAF8.CO.NZ “What we know about the Alpine Fault is that it tends to produce big earthquakes, roughly every 300 years,” Dr Orchiston said. 74 ... on the Alpine Fault [7-11]. This study investigates the potential for seismic seiches in Lake Tekapo, New Zealand, triggered by ground shaking from an Mw8.2 Alpine Fault earthquake. The Alpine Fault runs for about 600km along the west of the Southern Alps. "We do think that it's in a heightened phase of activity, and it's hard to say how long that will last. As the last quakes lifted a large stretch of New Zealand's southeastern coast up by two-three metres, a University of Otago team has been studying the effects on populations of coastal species. Current work and … "I would not expect the Alpine Fault to produce damaging ground shaking in Dunedin as it's too far away from the city. The fault's last quakes were between 1280 years and 760 years ago and moved the ground up to two metres vertically. Why is the CO2 level lower in my house than outside? The project goal is to improve the South Island's collective response capability to deal with a future magnitude 8 earthquake. Synthetic ground motions are used as a forcing boundary to drive lake water motions by further developing a tsunami simulation model—COMCOT—and coupling it with earthquake simulation model outputs. Prof Stirling warns these effects would be "much worse" for Dunedin than a major Alpine Fault quake. The roadshow is supported by the Ministry of Civil Defence and Emergency Management, the six South … Langridge said researchers in California and New Zealand have a long history of earthquake science collaboration and are learning from each other about the treatment of active faults and fault segmentation for seismic hazard models. The planning workshop is part of a series being led by Jon Mitchell, Project AF8 Programme Manager, in each of the 6 Civil Defence Emergency Management (CDEM) Group areas across the South Island in preparation for an eventual … We provide bus services in Queenstown and Dunedin to help you get to where you need to go. The next quake is predicted to be around magnitude 7-7.4. Scientists are now studying whether we should expect another Akatore Fault earthquake in the immediate future. Do equations for groundwater flow refer to water density? or, by Seismological Society of America. Hear from leading Alpine Fault scientists about the likely impacts of an Alpine Fault earthquake in your area and how we can be better prepared for such an event. Recent research (published in 2012) by GNS Science has extended our knowledge of the Alpine fault earthquake record back through the past 8000 years. The most recent earthquake could represent a "partial-section" rupture of only the central portion of the Alpine fault, a rupture of the fault's northern section that continued southwest into the central segment, or even triggered slip from a rupture along the nearby Marlborough Fault System. Click here to sign in with "By comparison, the Kaikōura Earthquake in 2016 ruptured a total fault length of 200km in the space of about two minutes," said Holden. New evidence of a 19th century earthquake on New Zealand's Alpine fault suggests that in at least one portion of the fault, smaller earthquakes may occur in between such large rupture events. Thank you for taking your time to send in your valued opinion to Science X editors. You can be assured our editors closely monitor every feedback sent and will take appropriate actions. However, the findings do suggest that seismic activity on the Alpine Fault is more complex than suspected, particularly along its northern reaches where the plate boundary transitions into another fault zone. Xiaoming Wang, Caroline Holden, William Power, Yaoru Liu, Joshu Mountjoy, Seiche Effects in Lake Tekapo, New Zealand, in an Mw8.2 Alpine Fault Earthquake, Pure and Applied Geophysics, 10.1007/s00024-020-02595-w, (2020). But new evidence of a 19th century earthquake indicates that in at least one portion of the fault, smaller earthquakes may occur in between such large rupture events. Fault line . "The Akatore Fault is the most active fault in Otago, and is the highest hazard fault for Dunedin," he told Newshub. In between earthquakes, the Alpine Fault is locked. 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. Dr Cox and Prof Bradley are speaking only at the Mackenzie events. Copyright © 2020 MediaWorks TV - All Rights Reserved, By subscribing you agree to our Terms of Access and Privacy Policy. 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. Due to the Alpine fault earthquake, the two main highways connecting the east of the South Island to the west (SH7 and SH73) and most parts of SH6 will be completely blocked one day post-disaster causing three Districts (Buller, Westland, and Grey) on the west coast to be isolated (Fig. Dunedin’s earthquake hazard was higher than Auckland’s. This document is subject to copyright. This active transform fault ruptures in a large earthquake every 291 ± 23 years, most recently in 1717. The events were confirmed by data collected from other nearby trenching sites and from geological deposits called turbidites, which are sediments shaken loose into a body of water by seismic activity, in lakes along the central section of the Alpine fault. This is a list of large earthquakes that have occurred in New Zealand. This means, the Alpine Fault is late in its seismic cycle … "One of the outcomes of this study is that you should expect a shorter recurrence interval of strong shaking at fault section ends," Langridge said. His work involves: fault and earthquake research in the South Island; the mapping of rock avalanches, earthquake-induced landslides and alluvial fan flooding hazards; and building a digital geological map dataset of Antarctica. Dr. Simon Cox is a Principal Scientist at GNS Science in Dunedin. Fortunately this was before the historic settlement of New Zealand. The best paleoseismic evidence to date suggests the southern and central sections of the Alpine Fault, at the boundary separating the Australian and Pacific tectonic plates, typically rupture during very large full-section earthquakes of magnitude 7.7 or larger. Representatives of fifty organisations from throughout Otago met in Dunedin today to participate in planning for the first week of response to a major Alpine Fault earthquake. As large earthquakes have not been experienced in the area of interest in the historical and instrumental records, user-specified scenario simulations are of great value. Prof Stirling recently said he wanted to make Otago people aware that there were potentially hazardous earthquake sources that were closer to Dunedin than the Alpine Fault. Mw7.0 Greek islands off the coast of western Turkey, Meridional Heat Transfer - Ocean and Atmosphere, Today's Climate Change and the Permian-Triassic Boundary, Science X Daily and the Weekly Email Newsletter are free features that allow you to receive your favorite sci-tech news updates in your email inbox. In the south of the country, eastward-directed subduction occurs beneath Fiordland on the Puysegur Subduction Zone. "There is no reason to assume that the heightened activity has died off, as it's been less than 1000 years since the last event. part may be reproduced without the written permission. The Alpine Fault has a high probability (estimated at 30%) of rupturing in the next 50 years. googletag.cmd.push(function() { googletag.display('div-gpt-ad-1449240174198-2'); }); The findings published in the Bulletin of the Seismological Society of America suggest that some places along the fault, particularly around the towns of Hokitika and Greymouth, could experience strong ground shaking from Alpine fault earthquakes more often than previously thought. The The effects will be amplified in South Island mountainous regions and high country where enormous damage can occur … The way that earthquake stresses around faults interact is very complex. The alpine fault earthquake will alter tectonic stress distribution, ... What will happen to the earth during the earthquake? At this stage we are unsure of how the Alpine Fault may have been affected, though it is likely that any effect would be very small. Professor Waters said the Akatore Fault remained a bigger threat to Dunedin than the Alpine Fault, which runs the length of the South Island. GeoNet has issued a warning following a magnitude 5.5 quake this morning near Milford Sound. In her talk Dr Orchiston will outline the science behind the Alpine Fault, progress of Project AF8 so far and describe some of the key issues that will be most relevant for Dunedin in the event of an Alpine Fault earthquake. "The ancient Akatore uplift was big enough to eliminate entire populations of intertidal species," the researchers say. The 3.24am quake was 5km deep and reported by more than 600 people around Queenstown and Wanaka. A graphic shows an indicative line of the Alpine Fault in relation to Wanaka and Queenstown. and Terms of Use. Earthquake-induced tsunami. You can unsubscribe at any time and we'll never share your details to third parties. Professor Craw said the old Akatore earthquake would have been similar in magnitude to the 2016 Kaikōura quake, with tens of kilometres of rocky coast affected, and the old shore lifted out of the water, well beyond the reach of the waves. The content is provided for information purposes only. The Alpine fault is the Pacific-Australian plate boundary in the South Island of New Zealand. "The old Akatore earthquake would have been similar in magnitude to the 2016 Kaikoura quake, with tens of kilometres of rocky coast affected, and the old shore lifted out of the water, well beyond the reach of the waves," says Professor Dave Craw. "By comparison, the Kaikōura Earthquake in 2016 ruptured a total fault length of 200km in the space of about two minutes," said Holden. ... which occurred close to the central part of the Alpine … ... so for us … . In order to prevent massive damage to Dunedin, Prof Stirling urges authorities to put in place effective hazard and risk communication plans to warn the public, and emergency management plans that deal with an Akatore Fault earthquake scenario. "It has had a heightened state of activity in the geologically recent period after a long period of quiescence," Prof Stirling told Newshub. A rupture along the full length of the fast-slipping Alpine Fault on New Zealand's South Island poses the largest potential seismic threat to the southern and central parts of the country. But if it happened again, given the population and buildings in the area, we wouldn't be so lucky. The Akatore Fault is close (20km or less)," he says. "Once we started working there [at the Staples site] the story really grew in large part because of the richness of dateable organic material in the trenches.". The Alpine Fault is a big feature of South Island geography and seismic activity. We have currently located 63 aftershocks, with 16 being magnitude 3 and above, this is … 5(b)). A new model has simulated the disruption a major Alpine Fault earthquake would have on the South Island's transport network - cutting off the West Coast for at least a week. It is therefore prudent to consider the Akatore Fault as potentially the most likely source of future strong ground shaking for Dunedin.". Evidence is growing the South Island's Alpine Fault, capable of devastating earthquakes of magnitude 8 and above, ruptures more frequently than previously believed. ... New Zealand’s Alpine Fault is a major crustal-scale structure that accommodates around 75% of relative Australian-Pacific plate motion. Approximate rupture dates are 1717AD, 1620 AD, 1450 AD, and 1100 AD. The most likely source of tsunami events which may affect Otago’s eastern coastline are large earthquakes (magnitude > 8), which cause a vertical displacement of the seabed along a fault line. Dunedin buses. A rupture along the full length of the fast-slipping Alpine Fault on New Zealand's South Island poses the largest potential seismic threat to the southern and central parts of the country. ", "That's why paleoseismology is a vital tool in understanding faults," he added, "because otherwise we'd have only short insights into the past.". Dr Caroline Orchiston from the Centre of Sustainability, University of Otago, outlines a new initiative called Project AF8, a multi-agency approach to response and resilience planning for a magnitude 8 earthquake in the South Island. Langridge and colleagues said that there isn't enough evidence yet to favor one of these scenarios over the others. The last such earthquake took place in 1717. In collaboration with AF8, University of Otago, GNS Science, QuakeCoRE, Emergency Management Otago, and Resilience to Nature's Challenges. ... Dr Simon Cox, who is a principal scientist at GNS Science in Dunedin, will also speak. By using our site, you acknowledge that you have read and understand our Privacy Policy This study analyzes 195 earthquakes recorded during the 6 month duration of the Southern Alps Passive Seismic Experiment (SAPSE) in 1995/1996 and two M₁. Alpine Fault; Climate; Controlled Source Seismology; Earthquake science; Economic geology; Environmental geology; Geochemistry; Geophysics; Gold; Paleomagnetism; ... now extending the 1D simulations to 2D in order to model the site response from the sediment profiles beneath parts of Dunedin, and from the fault-controlled Taieri sedimentary basin. Listen: Mike Puru talks with geologist Martha Savage about New Zealand's largest faultline. "We are calculating peak ground accelerations of >0.5g for Dunedin. Just days after South Island residents were shaken awake by a 5.5 magnitude Alpine Fault quake, University of Otago earthquake expert Professor Mark Stirling warns there's a bigger threat to Dunedin. ... 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