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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 details the impact assessments for a range of tsunami events.
25These events are based on the probabilistic hazard assessment conducted
26for the Western Australian coastline. A number of events are selected for
27return periods of 500, 1000 and 2000 years, see Section \ref{sec:tsunamiscenario}.
28%This report is the first in a series of tsunami assessments
29%of the North West Shelf. The scenario used for this study has
30%an unknown return period, but is considered a plausible event (see
31%Section \ref{sec:methodology}).
32%Subsequent assessments will use refined hazard models with
33%associate return periods. A suite of assessments will be
34%made for Onslow and other localities, as advised by FESA.
35
36Onslow has a population of around 800 and
37is part of the Shire of Ashburton in the Pilbara region of
38Western Autralia\footnote{http://www.pdc.wa.gov.au/region/political.htm}.
39Onslow supports
40a variety of industries, including oil, gas, mining, cattle,
41fishing and tourism.
42
43The modelling technique to simulate the
44impact ashore is discussed in Section \ref{sec:methodology} with
45event and data inputs
46discussed in Sections \ref{sec:tsunamiscenario} and \ref{sec:data} respectively.
47The inundation results are presented and discussed in Section \ref{sec:results} 
48and the impact modelling results outlined in Section \ref{sec:impact}.
49A summary of the results detailing issues
50regarding underlying data and further model development, are discussed
51in Section \ref{sec:summary}.
52
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