1 10 2 https://theses.otagogeology.org.nz/files/original/24bab10fbed5c5ad08b7217ba43042d8.pdf 5157f0cb7ecf8172be4a9f18aba8a874 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format MULTIPOLYGON (((171.303052248729 -44.9961429029632,171.711890051056 -45.2063152292055,171.619362892389 -45.2985952492034,171.229720706335 -45.0664819568099,171.303052248729 -44.9961429029632))) Author last name Last name of the Author Abbey Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? MSc Advisers Who supervised/advised this student Gorman, A.R. Abstract The Abstract for this thesis Submarine canyons are well documented, both around New Zealand and globally, but questions remain around the processes involved in their formation and evolution as well as around how their morphology reflects their developmental history. The Waitaki Canyon, located at the edge of the passive Otago Shelf in the Canterbury Basin, southeast New Zealand, presents an opportunity to investigate the near-surface features associated with a shelf-indenting submarine canyon using high-resolution seismic data. One such high-resolution survey was conducted in early 2015, collecting approximately 270 km of boomer seismic data in a high-density survey pattern centred at the head of the Waitaki Canyon. Approximately 40 km2 of the seafloor bathymetric data was also collected during that cruise. These data were analysed, along with approximately 100 km of boomer seismic data from a previous survey in the area and a selection of lower resolution seismic data from surveys conducted by the hydrocarbon industry, to investigate the subsurface structures in the vicinity of the Waitaki Canyon for evidence of changes in the canyon’s morphology throughout the Quaternary Period. South of the Waitaki Canyon, a large (several kilometres across) asymmetrical system of infilled paleochannels is intersected by a canyon-parallel survey line and canyon-perpendicular lines. Several high-order sequence boundaries are identifed throughout the survey area, and a region of seafloor depressions is observed on a ridge near the head of the canyon. Seismic reflections from the outer parts of the across-shelf survey lines are generally conformable, and do not show evidence of significant lateral migration of the canyon’s point of incision. The preferred interpretation of the stratigraphy and structures imaged in the data is that they represent the poorly preserved upper reaches of a series of paleochannels that had their heads somewhere west of the present canyon head and curved, or kinked, in very shallow S-shapes to rejoin the present path of the canyon. The canyon-parallel survey line thus intersects this kink and then approximately follows the centreline of the infilled channel, resulting in an asymmetric subsurface feature. The more recent symmetrical features are interpreted as non-axial tributaries or vestigial remains of this larger paleochannel. OURArchive handle The handle from the Otago University Research Archive (OURArchive) <a href="http://hdl.handle.net/10523/7400">http://hdl.handle.net/10523/7400</a> OURArchvive access level Open Access Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Waitaki Canyon Thesis description Number of pages, maps, CDs, etc. 142 pages A4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2017Abbey Creator An entity primarily responsible for making the resource Abbey, Cameron James (Cam) Date A point or period of time associated with an event in the lifecycle of the resource 2017 Title A name given to the resource The Waitaki Canyon - An investigation of the Late Quaternary development of a shelf-indenting submarine canyon using high-resolution boomer seismic data Subject The topic of the resource Geophysics Canterbury Basin canyon geophysics Otago shelf Quaternary submarine canyon Waitaki https://theses.otagogeology.org.nz/files/original/2e43754040d5e058eae9bc2bc8696374.pdf cd547ce6e786ce4ce53b42060da38700 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Geology theses OU Geology thesis Thesis or dissertation completed by University of Otago Geology students Location WKT (WGS84) The location stored in WKT (WGS84) format POLYGON ((170.546021910724846 -45.909302666524503,170.267271458731557 -46.152546149895599,170.110861646954135 -46.090114280022846,170.386507440564372 -45.906239878493096,170.546021910724846 -45.909302666524503)) Author last name Last name of the Author Bruce Project type Is it an MSc, PhD, BSc(Hons) or PGDipSci? BSc(Hons) Advisers Who supervised/advised this student Gorman, A.R. Abstract The Abstract for this thesis The position of the offshore extent of the active Akatore Fault, a NE- SW trending reverse fault that ,runs along the coast SW of Dunedin is poorly constrained. The Akatore Fault is associated with several other offshore coast-parallel faults based on previously obtained shallow controlled-source seismic data. Accurate identification and positioning of these possibly active fault structures is crucial for producing accurate models of earthquake associated hazards in the nearby Dunedin urban area. Several earthquakes, including those of 1974 and 1989, are attributed to movement on these faults. Single-channel electro-acoustic 'Boomer' and CHIRP seismic reflection data were collected along with CAATI side scan sonar (C3D) along 89 lines. 484 km of 'Boomer' seismic data were collected over ~550 km2 ; only 293 km of Chirp seismic data and side scan sonar were collected due to weather conditions. The majority of lines were collected along NW -SE azimuths, running from just outside the surf zone (<10 m water depth) to a maximum of 28 km offshore (~75 m water depth). Survey lines were spaced approximately 250 m apart near shore and up to 5 km apart for offshore lines. One 'Boomer; line ties the 1978 Takapu-1A well. Most lines image distinct east-dipping reflections that correlate to the nearby CretaceousTertiary sequence. 'Boomer' subsurface penetration is generally only limited by the presence of multiple reflections. Primary reflections were recorded from sub-surface depths of up to 90 m. In several areas, internally reflective basement schist was interpreted. Several significant structures were imaged within the survey area: (1) the Akatore Fault, (2) the Green Island Fault, and (3) the Takapu Anticline. The Akatore Fault was imaged very near shore in the southern portion of the survey, and a minimum displacement of 55 m was calculated. Offset on the Green Island Fault, a large high-angle reverse fault was relatively well constrained to ~200 m (east side up). The data suggest that the Green Island Fault may be a step-over from the Akatore Fault. High-resolution imaging of the Takapu Anticline suggests that the Takapu Fault does not reach within ~80 m of the seafloor. Department The department where the student is studying primarily. Geology Named locality Named locality describing the field area location. Otago continental shelf Thesis description Number of pages, maps, CDs, etc. ix, 74, 3 leaves : ill. (some col.), maps ; 30 cm Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 2010Bruce Creator An entity primarily responsible for making the resource Bruce, Callum David Date A point or period of time associated with an event in the lifecycle of the resource 2010 Title A name given to the resource Near-surface expression of active deformation on the shallow Otago continental shelf Subject The topic of the resource Geophysics Akatore Fault Otago shelf shallow controlled-source seismic