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[3241] | 1 | This report has described the impact to Onslow from a tsunami |
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| 2 | generated by a Mw 9 earthquake on the Sunda Arc subduction zone |
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| 3 | occurring at Mean Sea Level. |
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| 4 | There is no knowledge of the return period for this event. The |
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| 5 | modelling methodology, assumptions and data sources which are |
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| 6 | required to determine the impact to Onslow have also |
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| 7 | been described. |
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| 8 | As discussed in Section \ref{sec:issues}, there are issues |
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| 9 | with the underlying data set which may have vertical inaccuracies |
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| 10 | of approximately 1-2m. As a result, these results should be considered |
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| 11 | preliminary. |
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| 12 | These scenarios will be revisited once the probabilistic models |
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| 13 | are complete so that a suite of tsunami impact assessments can be made. |
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| 14 | It is therefore imperative that suitably accurate onshore data |
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| 15 | be made available to raise confidence in the impact assessments. |
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| 16 | |
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| 17 | Future activities to support the impact studies on the North West Shelf |
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| 18 | include: |
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| 19 | |
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| 20 | \begin{itemize} |
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| 21 | \item Sourcing of data sets |
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| 22 | \item Investigation of solution sensitivity to cell resolution, |
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| 23 | bathymetry and tsunami source uncertainties |
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| 24 | \item Location of boundary for simulation study area |
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| 25 | \item Investigation of friction coefficients |
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| 26 | \end{itemize} |
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| 27 | |
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| 28 | |
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