- Title
- Assessing the Tsunamigenic Potential of a Submarine Landslide Offshore Brooms Head, Australia
- Creator
- Buller, Elise J.; Power, Hannah E.; Kinsela, Michael A.; Mollison, Kendall C.; Hubble, Thomas C. T.
- Relation
- Australasian Coasts and Ports 2023 Conference. Australasian Coasts and Ports 2023 Conference Proceedings (Sunshine Coast, QLD 15-18 August, 2023) p. 248-254
- Relation
- https://coastsandports2023.com.au/
- Publisher
- Australasian Coasts and Ports Conference
- Resource Type
- conference paper
- Date
- 2023
- Description
- Submarine landslides (SMLS) are capable of triggering tsunamis that can be hazardous to nearby coastal populations and oceanic infrastructure, with SMLS-generated tsunami generally having more localised impacts and higher run-up distances than that of seismically generated tsunami. The full extent of the Brooms Head (BH) SMLS complex was recently mapped in 2022 onboard the RV Investigator. Prior to this, the bathymetry of this region was incomplete with previously identified SMLS scars only partially mapped. Since the acquisition of new bathymetry for the BH SMLS complex, a larger SMLS headscarp has been identified, providing new evidence for a large landslide site along the south-east Australian continental margin (SEACM). The aim of this study was to assess the tsunamigenic potential and associated hazard to the nearby coastline posed by the BH SMLS complex. SMLS-generated tsunami modelling was conducted using the two-layer extension of the open-source numerical code, Basilisk. The model has been extensively validated for and benchmarked against both laboratory and real-world tsunami data. Density of the failing sediment has been shown to greatly influence the resultant tsunami, hence, a range of density values, calculated during sediment core analysis along the SEACM was applied in this study. Results indicate that the adjacent coastline, particularly Yamba and the surrounding region, will be impacted by a damaging tsunami < 45 minutes after initial sediment failure, highlighting the importance of incorporating SMLS-generated tsunami modelling into coastal hazard assessment along the east Australian coastline.
- Subject
- submarine landslide; tsunami; hazard assessment; modelling
- Identifier
- http://hdl.handle.net/1959.13/1502895
- Identifier
- uon:55289
- Identifier
- ISBN:9781713884132
- Language
- eng
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