Authors / CoAuthors
Nanson, R.
Abstract
Perth Canyon is Australia's second largest submarine canyon, and its elongate and continental shelf-incising morphology contrasts with Australia's more prolific slope-confined canyons. The canyon's sinuous course extends for 120 km from the continental shelf break (~180 m depth, only 50 km offshore from Perth) to its fan at the foot of the continental slope (~4500 m). This seminar will describe the application of a new, internationally-collaborative mapping approach to capture the complexity of the canyon and to link its modern morphology to subsurface data and thereby reconstruct its geological evolution. Infilled incised valleys found in seismic data beneath the canyon headwall suggest that the canyon initially incised in the Late Cretaceous (around 70 million years ago), and subsequent incisions and canyon activity have since declined in scale. Repeat surveys of the canyon headwall following two relatively large earthquakes in 2018 reveal minimal instability of the seafloor and suggest that the canyon is now less active than in it has been in its geological past.
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document
eCat Id
148803
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
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Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
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- Wednesday Seminar
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- submarine canyons
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- Perth Canyon
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- Published_External
Publication Date
2024-05-13T08:07:37
Creation Date
2022-03-23T00:00:00
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completed
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To promote the scientific achievements of Geoscience Australia.
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asNeeded
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geoscientificInformation
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Wednesday Seminar
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Seminar recording as part of the Geoscience Australia public talks programs
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Extents
[-44.00, -9.00, 112.00, 154.00]
Reference System
Spatial Resolution
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