37 Works

Revised stratigraphic framework for the Pliocene to Holocene sedimentary deposits of the Auckland area

David J. A. Barrell, Kyle J. Bland, Matthew P. Hill & Julie M. Lee
Existing terminology for the relatively young and weak sedimentary geological formations of the Auckland area has limited utility for geological and geotechnical classification, because there is considerable variety in their material content. A revised stratigraphic naming framework has been developed for the Pliocene to Holocene sedimentary strata of the Auckland area, in consultation with Auckland geological and geotechnical practitioners. Sedimentary strata previously identified as Tauranga Group and/or its constituent Puketoka Formation in the Auckland area...

SLIDE (Wellington): seismic profiling of Camrose Grove, Wellington

Zane R. Bruce & Hamish Cameron
This report represents an aspect of the ground truthing methods used to confirm the geomorphic mapping carried out as part of the Stability of Land In Dynamic Environments (SLIDE) project within the Wellington Region. A simple hammer plate seismic survey was completed in Camrose Grove, Kingston, Wellington, on an area of fill identified from historical records of US Marine Corps construction in Camrose Grove during WW2. The purpose of the survey is to confirm the...

Landslides and debris flows in the Tasman District caused by ex-Tropical Cyclone Gita, 20-21 February, 2018

Brenda J. Rosser, Jon M. Carey, Katie E. Jones, Dougal B. Townsend & J. F. Crouch
Ex-Tropical Cyclone Gita hit New Zealand on 20–21 February 2018, bringing heavy rain and high winds to much of the country. The heaviest rainfall occurred in the Tasman District where more than 230 mm of rain fell in 18 hours triggering extensive shallow landslides and debris flows. The Takaka Hill Road was closed by 16 slips, which impacted the road for the following year. The most intense rainfall (78 mm/hr) occurred over a 3-hour period...

An updated set of tsunami action maps for Kermadec earthquakes

Aditya R. Gusman, David R. Burbidge & William L. Power
In previous work Gusman et al. (2019) created a new tsunami scenario database containing Tsunami Threat Forecast maps of New Zealand for tsunamis caused by earthquakes around the Pacific Ocean, including the Kermadec subduction zone. The purpose of the database is to rapidly provide a Threat Forecast Map when an earthquake similar to one in the database occurs. The Threat Forecast Maps provide a threat estimate expected in each coastal region around New Zealand from...

Landslides caused by the March 2019 West Coast storm, South Island, New Zealand

Matthew Wride & Saskia J. de Vilder
During the week of 25–31 March 2019, the West Coast of the South Island experienced an intense rainstorm. The rain was widespread, extending from Haast to Hokitika, with the highest intensity of rainfall recorded in the range front south of Hokitika. The March 2019 storm resulted in a record amount of rainfall recorded over a 48-hour period in the Cropp River Catchment. The result of this extreme rainfall event was widespread flooding and landslides, including...

Geological model of South Dunedin

Phil J. Glassey, David J. Barrell, Belinda Smith-Lyttle, S Hornblow & B Mackay
The South Dunedin suburb of Dunedin city lies on a coastal plain, which was a salt marsh prior to urban development, that began in 1840. Now one of the more densely populated areas in New Zealand, South Dunedin is within 2 m of current sea level, has groundwater close to the surface and is vulnerable to flood hazards that are expected to be worsened by sea-level rise. In addition, soft sediments that underlie much of...

Geologic, earthquake and tsunami modelling of the active Cape Egmont Fault Zone

Hannu Seebeck, Glenn P Thrasher, G. P. D. Viskovic, Clarrie Macklin, Suzanne Bull, Xiaoming Wang, Caroline Holden, Yoshihiro Kaneko, V Mouslopoulou & John G. Begg
The Cape Egmont Fault Zone in the southern Taranaki Basin, New Zealand, is a complex series of synthetic and antithetic dip-slip normal faults accommodating present-day extension. The fault zone comprises new and reactivated faults developed over multiple phases of plate boundary deformation during the last 100 Myrs. The fault zone is well imaged on petroleum industry seismic reflection data, with a number of faults exposed and studied onshore. The Cape Egmont Fault Zone is seismically...

ACE Programme – Critical Incident Leadership course learner guide

Hana Craig & Scott Kelly
The seventh batch (2021 intake) of the AHA Centre Executive (ACE) Programme are undertaking the programme online. The Critical Incident Leadership course is one component of the ACE Programme and is facilitated by GNS Science. To deliver the course online, GNS Science will utilise iQualify and Zoom platforms. This document forms a Learner Guide for participants, and sets out the following: Course requirements; Activities needing to be completed before commencing the course; Logging into iQualify,...

West Coast groundwater dynamics and hydrochemical evolution as inferred from regional water age and chemistry tracer data

Magali Moreau, Uwe Morgenstern, Rob W. van der Raaij & J. Horrox
This study aims to holistically describe the flow sources, pathways and lag times of water through the rivers and aquifers of the West Coast catchments. This information is required to ground truth and improve groundwater flow models and management tools. Such improvements will help to prevent degradation of rivers and aquifers from land-use activities that impact on cultural, recreational and economical values, as well as on drinking water supplies and quality. This study is mainly...

Thermal properties of Matahina Ignimbrite

L. McGovern, Fiona Sanders, Michael D. Rosenberg, Anya M. Seward, Isabelle Chambefort & Rob H. Funnell
Thermal properties of a 140 m section of the Matahina Formation ignimbrite were determined from a rock core drilled near Rotorua, New Zealand. For this project, thermal conductivity, thermal diffusivity and specific heat capacity were determined using the divided-bar method in order to investigate interrelationships with density/porosity and lithological variation throughout the unit. Thermal conductivity ranged from 0.25 to 1.44 W/(m.K) for dry samples and 1.06 to 2.18 W/(m.K) for water-saturated samples. Specific heat capacity...

Interpreting borehole data with machine learning: A pilot rtudy

Robert Buxton, Donal Krouse, Cecile Massiot & Mark J. F. Lawrence
Classifying and interpreting multi-sensor geophysical borehole (wireline) data is normally undertaken manually by a geologist and is extremely resource intensive, both in terms of skilled people and time. Machine learning techniques have been applied to wireline data overseas; however, those techniques are not necessarily directly applicable to New Zealand sedimentary rocks and little investigation has been done in geothermal settings. This pilot study aims to investigate machine learning algorithms and approaches to allow the automated...

New Zealand Fault-Rupture Depth Model v1.0: a provisional estimate of the maximum depth of seismic rupture on New Zealand’s active faults

Susan M. Ellis, Stephen Bannister, Russ J. Van Dissen, Donna Eberhart-Phillips, Caroline Holden, Carolyn Boulton, Martin E. Reyners, Robert H. Funnell, Nick Mortimer & Phaedra Upton
This report presents a new and provisional estimate of the maximum depth of rupture on New Zealand’s active faults (“New Zealand Fault-Rupture Depth Model v1.0”) based on a combination of two independent models. The first model uses regional seismicity distribution from a relocated earthquake catalogue to calculate the 90% seismicity cut-off depth (D90) representing the seismogenic depth limit H. This is multiplied by an overshoot factor representing dynamic propagation of rupture into the conditional stability...

Geology of the Hyde-Macraes Shear Zone and Waihemo Fault Zone area, northeastern Otago

Adam P. Martin, Belinda Smith Lyttle, A. H. Allibone, H. Blakemore, Simon C. Cox, D. Craw, S. Doyle, Richard L. Kellett, D. J. MacKenzie, Nick Mortimer, T. Ritchie & Tusar R. Sahoo
Geology of the Hyde-Macraes Shear Zone and Waihemo Fault Zone Area is a new 1:50 000 scale geological map of northeastern Otago. The >3000 km2 map area includes the trans-crustal Waihemo Fault Zone, the economically significant Hyde-Macraes Shear Zone in the Otago Schist and the western edge of the Canterbury Basin. The map area is two-thirds onshore and one-third offshore, amalgamated into a seamless geological map (sheet 1) with legend and cross-sections (sheet 2). The...

Review of global practice on data capture tools development, applications and limitations

Sheng-Lin Lin
Rapid and profound changes in the technology used for data acquisition, computing and information management provides a framework that has the potential to allow communities to consider acquiring, analysing and managing data in new ways. Improving the collection and management of data, immediately in post-disaster response and reconnaissance and in long-term impact assessments, is central to enabling knowledge of such events to be used and applied to improve community resilience to future disasters. This report...

Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip (HOBITSS VI, TAN1907)

Laura M. Wallace &
HOBITSS VI was a 12-day (29 October – 9 November 2019) Wellington to Wellington R/V Tangaroa voyage (TAN1907). Objectives of TAN1907 were to undertake seafloor geodetic and seismic instrument deployments, recoveries and surveys offshore of the Gisborne, Hawke’s Bay and Wairarapa coasts. The seafloor geodetic aims involve using Bottom Pressure Recorders (BPRs) to determine the cm-level vertical movement (upward or downward) of the seafloor during slow-slip events (SSEs), as well as to deploy a Wave...

Modelling fire following earthquake for multiple scenarios affecting Wellington City

Finn R. Scheele, Biljana Lukovic, Jose Moratalla, Alexandre Dunant & Nick A. Horspool
Fires are a common secondary hazard following earthquakes and, on rare occasions, can develop into major events with severe consequences. Wellington City has many characteristics that make it susceptible to fire following earthquake (FFE), including the potential for conflagrations and significant losses (e.g. property, infrastructure and casualties). Through the ‘It’s Our Fault’ (IOF) research programme, we are revisiting FFE modelling for Wellington City, building on the previous models developed by Cousins et al. (2002). Previous...

Household relocation and recovery following the 2017 Edgecumbe flooding: results of a survey

Finn R. Scheele, Lucy H. Kaiser & Ryan Paulik
In April 2017, the Rangitāiki River breached a stopbank, resulting in widespread flooding within the town of Edgecumbe, Bay of Plenty. The evacuation of the town and damage to homes led to major disruption for residents. The relocation of households, both temporary and permanent, had long-lasting effects on the community. A questionnaire to gather residents’ experiences during the event and subsequent recovery was hand-delivered to residential addresses in Edgecumbe in November 2020. Topics included housing...

February 2020 Southland flooding evacuation and response: Results of a survey

Lucy H. Kaiser, Finn R. Scheele, Sally H. Potter, Maureen A. Coomer & Joshua Stewart
In February 2020, the communities of Gore, Mataura and Wyndham in Southland, Aotearoa New Zealand, were impacted by a significant flood event, leading to a mandatory evacuation of the community and numerous flooded properties. A survey of the communities of Gore, Mataura and Wyndham was conducted in July 2020 to gather residents’ perspectives and experiences during the flooding event and ensuing evacuation. Topics included risk perception, weather and flood warnings, evacuation, impacts and demographics. Of...

Cascading hazard and risk framework for Hikurangi Flagship project

David R. Burbidge, Alex Dunant, Jose Moratalla, Vinod K. Sadashiva, S. R. Uma & Annemarie Christophersen

Clyde Dam seismic hazard reassessment, phase 3: seismic hazard analysis

Mark W. Stirling, Nicola J. Litchfield, David A. Rhoades, Graeme H. McVerry & Russ J. Van Dissen

Earthquake-Induced Landscape Dynamics (EILD) end-user and stakeholder tools engagement plan

Philip J. Glassey & Wendy S. A. Saunders
The 14 November 2016 MW 7.8 Kaikōura Earthquake generated thousands of landslides, hundreds of significant landslide dams and damaged hillslopes that are now susceptible to failure during rainstorms and aftershocks. This debris, when further mobilised, will create new hazards, including further landslides, dams, rapid aggradation and formation of alluvial fans and floodplains, and increased river channel instability as the debris cascades from hillslope to sea. These hazards can persist for decades, requiring active management by...

Aggregate opportunity modelling for New Zealand

Matthew P. Hill
Efficient utilisation of New Zealand’s aggregate resources is critical to supporting infrastructure development as well as reducing operational and transport costs related to extraction of the raw materials. A mineral potential modelling approach has been used to identify places with opportunity for future hard rock and gravel extraction across New Zealand. Geographic information system (GIS) software has been used to build a spatial model of the critical components of aggregate opportunity using digital geological, land-use,...

Indigenous co-governance of volcanoes

Smrithi Talwar
Westernised nations typically conceptualise nature and landscapes as being subject to property-based ownership. Whether owned by private individual(s) or by the state, the owner has the right to modify its features, to permit its modification by others, and the right to take action against those who modify or impact the resource through their actions. By contrast, traditional or indigenous relationships with nature and landscapes are rooted in a very different paradigm of human-nature relations. This...

Geochemical characterisation of Māori artefacts from Kawhia Museum, New Zealand using pXRF

Karyne M. Rogers, John Thomson, Hamish J. Campbell, Boss Mahara, Oliver McLeod & Diane Bradshaw
Non-destructive portable X-ray fluorescence spectroscopy (pXRF) was used to geochemically characterise 160 indigenous Māori stone artefacts residing in the Kāwhia Museum. Geochemical comparisons were made to determine relationships between artefacts and assign lithology and origin based on their elemental composition. The most abundant artefacts were toki (adzes, 80 samples), made of either argillite (48 samples) or basalt (32 samples) rock, but also included obsidian flakes, sinker stones, patu and patu ōnewa. Key rock types included...

It's Our Fault Hikurangi Subduction Zone hazard: south Palliser Bay Holocene marine terraces

Nicola J. LItchfield, Andrew Howell, Kate J. Clark & Genevieve Coffey
The Greater Wellington region sits above a currently locked part of the Hikurangi Subduction Zone (interface) and, to date, no unequivocal evidence for past subduction earthquakes has been found in the region. In this study, we investigate Holocene marine terraces along the south Palliser Bay coast to test if they were uplifted in earthquakes on the Palliser–Kaiwhata Fault in the Pacific Plate or the Hikurangi subduction interface. Up to four low-lying marine terraces were mapped...

Registration Year

  • 2021
    37

Resource Types

  • Text
    37

Affiliations

  • GNS Science
    37
  • Victoria University of Wellington
    2
  • National Institute of Water and Atmospheric Research
    2
  • University of Otago
    1
  • University of Hawaii at Manoa
    1
  • Callaghan Innovation
    1
  • University of Auckland
    1
  • Massey University
    1