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1The Fire and Emergency Services Authority (FESA) of Western Australia  and
2associated volunteers respond to a wide range of emergencies
3as well as undertaking search and rescue operations on land and
4water\footnote{http://www.fesa.wa.gov.au/internet/}.
5FESA helps the West Australian
6community prepare, prevent (where possible) and respond safely to disasters.
7FESA also aims to reduce injury, loss of life and destruction of property in
8Western Australian communities through proactive measures.
9These measures involve understanding the relative risk
10of the disaster so that resources can be directed to appropriate areas
11and corresponding evacuation plans put in place. 
12
13The key role of the Risk Research Group at Geoscience Australian
14is to develop knowledge on the risk from natural and
15human-caused hazards for input to policy and operational decision making on
16the mitigation of risk to Australian communities. The Group achieves
17this through the development of computational methods, models and decision
18support tools that assess the hazard, vulnerability and risk posed by hazard
19events. To develop an understanding of the tsunami risk, GA has developed
20decision support tools, consisting of inundation
21maps overlaid on aerial photography of the region
22detailing critical infrastructure as well as damage modelling estimates.
23
24This report is the first in a series of tsunami assessments
25of the North West Shelf. The scenario used for this study has
26an unknown return period, but is considered a plausible event (see
27Section \ref{sec:methodology}).
28Subsequent assessments will use refined hazard models with
29associate return periods. A suite of assessments will be
30made for Onslow and other localities, as advised by FESA.
31
32Onslow has a population of around 800 and
33is part of the Shire of Ashburton in the Pilbara region of
34Western Autralia\footnote{http://www.pdc.wa.gov.au/region/political.htm}.
35Onslow supports
36a variety of industries, including oil, gas, mining, cattle,
37fishing and tourism.
38
39The modelling technique to simulate the
40impact ashore is discussed in Section \ref{sec:methodology} and data inputs
41discussed in Section \ref{sec:data}.
42The inundation results are presented and discussed in Section \ref{sec:results} 
43and the impact modelling results outlined in Section \ref{sec:impact}.
44A summary of the results detailing issues
45regarding underlying data and further model development, are discussed
46in Section \ref{sec:summary}.
47
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