title: Seismic hazard in the Taupo - Reporoa Region

authors: Pyne, Adrian

subjects: Earthquake

abstract: New Zealand lies astride a convergent plate margin, as a result it experiences hundreds of earthquakes a year. This study was commissioned in response to Environment Waikato's contingency planning for such natural disasters.

The Taupo - Reporoa region was identified in a report to Environment Waikato (Waikato Regional Council) as needing to be studied, in order to quantify the level of earthquake hazard. This region lies in the centre of the Taupo Volcanic Zone, and has, over thousands of years built up considerable thicknesses of unconsolidated mainly volcanogenic materials. It is recognised that towns and cities that are sited on these materials are at risk from amplification of seismic waves and will experience greater damage, than if they were on hard rock.

Soils were analysed by the following geotechnical tests: hand penetrometer, Bush penetrometer, shear vane, the standard compression test, and dynamic cyclical loading. Samples were also taken for soil moisture and bulk density. The results from these tests have been used to evaluate the region for seismic hazard, and to semi-quantitatively correlate with reports and claims of damage from earthquakes. A number of parameters were able to be derived from the field tests and the cyclic loading which were used in the final analysis.

The results showed that some soils were substantially weaker than others, which correlated with historical accounts of damage. A seismic microzoning map was constructed on the basis of the difference in soil strengths.

text: Seismic hazard in the Taupo - Reporoa Region New Zealand lies astride a convergent plate margin, as a result it experiences hundreds of earthquakes a year. This study was commissioned in response to Environment Waikato's contingency planning for such natural disasters.

The Taupo - Reporoa region was identified in a report to Environment Waikato (Waikato Regional Council) as needing to be studied, in order to quantify the level of earthquake hazard. This region lies in the centre of the Taupo Volcanic Zone, and has, over thousands of years built up considerable thicknesses of unconsolidated mainly volcanogenic materials. It is recognised that towns and cities that are sited on these materials are at risk from amplification of seismic waves and will experience greater damage, than if they were on hard rock.

Soils were analysed by the following geotechnical tests: hand penetrometer, Bush penetrometer, shear vane, the standard compression test, and dynamic cyclical loading. Samples were also taken for soil moisture and bulk density. The results from these tests have been used to evaluate the region for seismic hazard, and to semi-quantitatively correlate with reports and claims of damage from earthquakes. A number of parameters were able to be derived from the field tests and the cyclic loading which were used in the final analysis.

The results showed that some soils were substantially weaker than others, which correlated with historical accounts of damage. A seismic microzoning map was constructed on the basis of the difference in soil strengths.

year: 1995

title: Strangles: The Molecular Identification and Epidemiology of Streptococcus equi subsp. equi

authors: Patty, Olivia Anne

subjects: strangles

abstract: A conventional PCR diagnostic test was established to confirm the microbiological isolation of Streptococcus equi subsp. equi (S. equi), the causative agent of strangles. This test was based on the amplification of the seeI gene, which is species-specific for S. equi. Further, a multiplex PCR was developed using species-specific primers; to identify the presence of S. equi and two other streptococci know complicate the diagnosis of strangles in horses, Streptococcus equi subsp. zooepidemicus (S. zooepidemicus) and Streptococcus dysgalactiae subsp. equisimilis (S. equisimilis). A total of 18 clinical isolates of S. equi plus the Pinnacle IN vaccine isolate, two isolates of S. zooepidemicus and four isolates of S. equisimilis were obtained via culture and used in the development of the multiplex diagnostic tool. Two multiplex tests were trialed; a conventional multiplex PCR and a real-time multiplex PCR.

Both the conventional and real-time multiplex PCR’s were able to distinguish between the streptococci and accurately identified all isolates. However, further testing on 26 field specimens revealed that the real-time multiplex PCR had lower specificity, sensitivity and diagnostic accuracy as compared to the conventional multiplex PCR. This was theorised to be the result of the PEG/KOH solution used in the DNA extraction, possibly interfering with the intercalating dye in the real-time reaction. Based on these preliminary results, the conventional multiplex PCR diagnostic test developed here is recommended for further trials to determine its robustness.

The 19 S. equi isolates obtained, including the vaccine, were further subjected to epidemiological studies. These included sequencing of the variable N-terminal region of the antiphagocytic M-protein SeM to determine SeM allele subtypes and a Sau-PCR amplification method, which previously has not been trialled on S. equi isolates. Sau-PCR involves digestion of genomic DNA and subsequent amplification. Two novel strains of S. equi were found within NZ based on the variable region of the seM gene, SeM alleles 99 and 100. SeM allele 100 had a higher pervalance over allele 99 as it was isolated in 6 out of 9 outbreaks and was found to occur on both the North and South Islands of New Zealand. SeM allele 99 was only found to occur on the North Island. Further to this study, the Pinnacle IN vaccine strain, SeM 2 was isolated from lymph node abcesses of two horses. It was unclear as to whether this ‘vaccine breakdown’ was just a severe adverse reaction to the vaccine or if the vaccine reverted to a more virulent type. The Sau-PCR was able to differentiate between the field isolates of S. equi and the vaccine strain but was unable to further differentiate between the field isolates and was therefore determined not as valuable for S. equi epidemiological studies.

text: Strangles: The Molecular Identification and Epidemiology of Streptococcus equi subsp. equi A conventional PCR diagnostic test was established to confirm the microbiological isolation of Streptococcus equi subsp. equi (S. equi), the causative agent of strangles. This test was based on the amplification of the seeI gene, which is species-specific for S. equi. Further, a multiplex PCR was developed using species-specific primers; to identify the presence of S. equi and two other streptococci know complicate the diagnosis of strangles in horses, Streptococcus equi subsp. zooepidemicus (S. zooepidemicus) and Streptococcus dysgalactiae subsp. equisimilis (S. equisimilis). A total of 18 clinical isolates of S. equi plus the Pinnacle IN vaccine isolate, two isolates of S. zooepidemicus and four isolates of S. equisimilis were obtained via culture and used in the development of the multiplex diagnostic tool. Two multiplex tests were trialed; a conventional multiplex PCR and a real-time multiplex PCR.

Both the conventional and real-time multiplex PCR’s were able to distinguish between the streptococci and accurately identified all isolates. However, further testing on 26 field specimens revealed that the real-time multiplex PCR had lower specificity, sensitivity and diagnostic accuracy as compared to the conventional multiplex PCR. This was theorised to be the result of the PEG/KOH solution used in the DNA extraction, possibly interfering with the intercalating dye in the real-time reaction. Based on these preliminary results, the conventional multiplex PCR diagnostic test developed here is recommended for further trials to determine its robustness.

The 19 S. equi isolates obtained, including the vaccine, were further subjected to epidemiological studies. These included sequencing of the variable N-terminal region of the antiphagocytic M-protein SeM to determine SeM allele subtypes and a Sau-PCR amplification method, which previously has not been trialled on S. equi isolates. Sau-PCR involves digestion of genomic DNA and subsequent amplification. Two novel strains of S. equi were found within NZ based on the variable region of the seM gene, SeM alleles 99 and 100. SeM allele 100 had a higher pervalance over allele 99 as it was isolated in 6 out of 9 outbreaks and was found to occur on both the North and South Islands of New Zealand. SeM allele 99 was only found to occur on the North Island. Further to this study, the Pinnacle IN vaccine strain, SeM 2 was isolated from lymph node abcesses of two horses. It was unclear as to whether this ‘vaccine breakdown’ was just a severe adverse reaction to the vaccine or if the vaccine reverted to a more virulent type. The Sau-PCR was able to differentiate between the field isolates of S. equi and the vaccine strain but was unable to further differentiate between the field isolates and was therefore determined not as valuable for S. equi epidemiological studies.

year: 2012

title: Ngā niho tēte o Pekehāua: An indigenous articulation of governance

authors: Mahuika, Rangimarie

subjects: Indigenous Governance

abstract: This thesis originally set out to examine the structures and models available within New Zealand for a post-settlement tribal governance framework that would meet the Office of Treaty Settlements requirements while empowering the needs and aspirations of Ngāti Rangiwewehi. During the course of the study, as a result of the fast-tracking of our tribal settlement this emphasis changed. With Ngāti Rangiwewehi electing to utilise the government recommended templates for the post-settlement entity, the research shifted to consider the evolution of governance within the tribe, looking at the ways tribal governance had developed from traditional practices to our current governance frameworks. It was anticipated that gaining a deeper understanding of the factors that have shaped and influenced our governance would also give us the necessary insights to adapt the Crown model the tribe had adopted to ensure it was able to meet Ngāti Rangiwewehi’s future aspirations. This belief was grounded in an understanding that prior to the arrival of Pākehā to Aotearoa/New Zealand Ngāti Rangiwewehi, along with all other iwi Māori, had their own systems of Governance. Our governance frameworks, encapsulated within our tikanga and kawa, operated to produce a strong, vibrant, and self-determining society. Through colonisation, and its imposed Western frameworks for governance within Aotearoa New Zealand, traditional Māori frameworks for law and governance were undermined, deconstructed, or marginalised to make way for the civilizing discourses and structures of the Settler, as enforced by the British Crown. Although the dominant system of law and frameworks for governance may have changed, Ngāti Rangiwewehi and Māori desires for self-determination have not.
Against this background the central question of this study has itself evolved, initially contemplating to what extent Ngāti Rangiwewehi might be able to remain self-determining in and through their post-settlement governance arrangements. The overwhelming conclusion the study could not avoid was that any governance approach drawn from the settler-colonial Eurocentric system currently dominant in New Zealand would be incapable of supporting tribal aspirations for self-determination. What was equally evident was the continued determination that the tribe, collectively and individually, maintained to mediate the imposed governance frameworks that interfere in our ability to fully exercise our tino rangatiratanga, or in our iwi-specific context, our tino Rangiwewehitanga. This observation led to the final iteration of the thesis question which asks what frameworks for governance would best empower Ngāti Rangiwewehi to be self-determining in and beyond this post-settlement governance era? Throughout the research what became apparent was the potential to utilise our traditional frameworks for governance, described and encapsulated within this study as Rangiwewehitanga, a decolonial paradigm for tribal governance. Viewed in this way, Rangiwewehitanga expands our understanding of governance beyond the limited perspectives imposed through colonization and requires our people to recognise and return to the wisdom of our ancestral teachings to craft the most appropriate pathways forward.

text: Ngā niho tēte o Pekehāua: An indigenous articulation of governance This thesis originally set out to examine the structures and models available within New Zealand for a post-settlement tribal governance framework that would meet the Office of Treaty Settlements requirements while empowering the needs and aspirations of Ngāti Rangiwewehi. During the course of the study, as a result of the fast-tracking of our tribal settlement this emphasis changed. With Ngāti Rangiwewehi electing to utilise the government recommended templates for the post-settlement entity, the research shifted to consider the evolution of governance within the tribe, looking at the ways tribal governance had developed from traditional practices to our current governance frameworks. It was anticipated that gaining a deeper understanding of the factors that have shaped and influenced our governance would also give us the necessary insights to adapt the Crown model the tribe had adopted to ensure it was able to meet Ngāti Rangiwewehi’s future aspirations. This belief was grounded in an understanding that prior to the arrival of Pākehā to Aotearoa/New Zealand Ngāti Rangiwewehi, along with all other iwi Māori, had their own systems of Governance. Our governance frameworks, encapsulated within our tikanga and kawa, operated to produce a strong, vibrant, and self-determining society. Through colonisation, and its imposed Western frameworks for governance within Aotearoa New Zealand, traditional Māori frameworks for law and governance were undermined, deconstructed, or marginalised to make way for the civilizing discourses and structures of the Settler, as enforced by the British Crown. Although the dominant system of law and frameworks for governance may have changed, Ngāti Rangiwewehi and Māori desires for self-determination have not.
Against this background the central question of this study has itself evolved, initially contemplating to what extent Ngāti Rangiwewehi might be able to remain self-determining in and through their post-settlement governance arrangements. The overwhelming conclusion the study could not avoid was that any governance approach drawn from the settler-colonial Eurocentric system currently dominant in New Zealand would be incapable of supporting tribal aspirations for self-determination. What was equally evident was the continued determination that the tribe, collectively and individually, maintained to mediate the imposed governance frameworks that interfere in our ability to fully exercise our tino rangatiratanga, or in our iwi-specific context, our tino Rangiwewehitanga. This observation led to the final iteration of the thesis question which asks what frameworks for governance would best empower Ngāti Rangiwewehi to be self-determining in and beyond this post-settlement governance era? Throughout the research what became apparent was the potential to utilise our traditional frameworks for governance, described and encapsulated within this study as Rangiwewehitanga, a decolonial paradigm for tribal governance. Viewed in this way, Rangiwewehitanga expands our understanding of governance beyond the limited perspectives imposed through colonization and requires our people to recognise and return to the wisdom of our ancestral teachings to craft the most appropriate pathways forward.

year: 2019