dc.contributor.advisor |
Brook, Martin |
en |
dc.contributor.author |
Strain, Matthew |
en |
dc.date.accessioned |
2020-10-15T22:23:57Z |
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dc.date.available |
2020-10-15T22:23:57Z |
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dc.date.issued |
2020 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/53304 |
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dc.description |
Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
Landslides tend to be triggered by rainfall or by earthquakes in New Zealand, and if the effects of landslides are to be mitigated and avoided, then the causes of landslide activations, and importantly, reactivations, need to be understood in a local context. Geophysical investigations provide a non-invasive approach to interpreting spatial variations of the subsurface, and overseas, a range of geophysical techniques have been applied to landslide investigations. The 2016, Mw 7.8 Kaikōura earthquake caused almost 30,000 coseismic landslides within North Canterbury and Marlborough in the South Island, New Zealand. Here, 2D Electrical Resistivity Tomography (ERT) was applied to two deep-seated landslides: (1) Seafront Landslide in the Clarence Valley and (2) Leader Landslide in the Leader Valley. Inverted models of resistivity were produced to aid interpretation of subsurface features, such as the failure surface, internal structure, lithological variations, and hydrology. The acquisition process allows for comparisons to be conducted between common electrode configurations (arrays) and the ability to determine their effectiveness for landslides of this type. The ERT investigations were supported by a ground model, adapted specifically for a geophysical investigation using geologic first principles. Results show that this combination of engineering and geophysical techniques are effective approaches for distinguishing landslide features, but certain measures should be taken to ensure an effective interpretation of resistivity data. To aid the interpretation of non-unique resistivity data, other geophysical methods such as seismic methods (such as refraction and MASW) and Ground Penetration Radar (GPR), as well as direct testing in boreholes (i.e. piezometers) would need to be conducted. |
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dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
Masters Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA |
en |
dc.rights |
Restricted Item. Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
Engineering geophysical investigation of coseismic landslides from the 2016 Kaikoura earthquake |
en |
dc.type |
Thesis |
en |
thesis.degree.discipline |
Geology |
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thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Masters |
en |
dc.date.updated |
2020-09-30T00:12:31Z |
en |
dc.rights.holder |
Copyright: the author |
en |
dc.identifier.wikidata |
Q112953927 |
|