
This report is being provided to the Fire and Emergency Services Authority
(FESA)
as part of the Collaborative Research Agreement (CRA) 
with Geoscience Australia.
FESA recognises the potential vulnerability of the Western Australia
coastline to tsunamigenic earthquakes originating from 
the Sunda Arc subduction zone. There is
historic evidence of such events, \cite{CB:ausgeo}, 
and FESA has sought to assess
the relative risk of its urban and regional communities to the tsunami
threat and develop detailed response plans.

This report is the first in a series of studies to assess the relative
risk to the tsunami threat. The methods, assumptions and results of a
single tsunami source scenario is described for the Onslow area in the 
North West shelf region. 
Onslow has a population of around 800
is part of the Shire of Ashburton in the Pilbara region of Western Autralia
\footnote{http://www.pdc.wa.gov.au/region/political.htm}. Onslow supports
a variety of industries, including oil, gas, mining, cattle, 
fishing and tourism.

The report will outline the methods of modelling the tsunami from its 
source to its impact ashore. Section \ref{sec:tsunamiscenario} provides
the background to the scenario used for this study. Whilst 
the return period of this scenario is unknown, it
can be be classed as a plausible event. 
Future studies
will present a series of scenarios for a range of periods to 
assist FESA in developing appropriate plans for a range of event impacts. 
The modelling technique to develop the 
impact ashore will be discussed in Section \ref{sec:anuga} with data inputs
discussed in Section \ref{sec:data}.
Inundation results shown in Section \ref{sec:results} and 
impact modelling results shown in Section \ref{sec:impact}.
The report concludes with a summary of the results detailing issues
regarding data and further model development.

