1 | This report is being provided to the Fire and Emergency Services Authority |
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2 | (FESA) as part of the Collaborative Research Agreement (CRA) |
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3 | with Geoscience Australia (GA). |
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4 | FESA has recognised the potential vulnerability of the Western Australia |
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5 | coastline to tsunami originating from earthquakes on |
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6 | the Sunda Arc subduction zone. |
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7 | There is historic evidence of tsunami affecting the |
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8 | Western Australia coastline, \cite{CB:ausgeo}, |
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9 | and FESA has sought to assess |
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10 | the relative risk of its urban and regional communities to the tsunami |
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11 | threat and develop detailed response plans for a range of plausible events. |
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12 | |
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13 | This report describes the modelling methodology and initial results |
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14 | for a specific tsunami-genic event as it impacts the Onslow township |
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15 | and its surrounds. In particular, maximum inundation maps are shown |
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16 | and discussed |
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17 | for the event occurring at mean sea level as well as |
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18 | highest and lowest astronomical tide. The inundation results allow |
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19 | estimation of the number of houses inundated and collapsed, as well as |
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20 | the numbers of persons affected. The Onslow township has approximately |
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21 | 350 residential structures and a population of around 800. |
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22 | For this specific event at high tide, approximately |
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23 | 100 houses are inundated with two of those collapsing. Approximately |
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24 | 15-20\% of the population will sustain injuries, including fatalities. |
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25 | |
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26 | Future studies |
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27 | will present a series of scenarios for a range of return periods to |
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28 | assist FESA in developing appropriate plans for a range of event impacts. |
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29 | This will also allow an assessment of the relative tsunami risk |
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30 | to communities along the NW Shelf of WA. |
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31 | This report and the decision support tool are the |
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32 | June 2006 deliverables of the Collaborative Research Agreement, |
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33 | Tsunami Impact Modelling for WA, between FESA and GA. |
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34 | |
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