The tsunami hazard faced by Australia ranges from relatively low along the southern coasts of Australia to moderate along the west coast of Western Australia.
Because the total energy within the wave does not change, the energy is transferred to increasing the wave height (or amplitude). A tsunami is often a series of waves and the first may not necessarily have the greatest amplitude.
In the open ocean, even the largest tsunami are relatively small, with wave heights typically tens of centimetres or less away from the initial tsunami generation zone.
Interestingly, this causes the speed of a tsunami to be controlled by the water depth, with faster speeds in deeper water, unlike wind-generated waves.
Consequently, a tsunami slows as it approaches land and reaches increasingly shallow water, with the distance between successive wave peaks decreasing.
Several significant tsunami have impacted Australia's north west coast region.
The largest run-up (measured as elevation about sea level) was recorded as 7.9m (Australian Height Datum (AHD)) at Steep Point in Western Australia from the July 2006 Java tsunami. DOI: 10.1177/0309133314522282 Geoscience Australia receives real-time data from over 60 seismic stations in Australia and more than 130 international seismic stations.There is evidence that the Australian coast may have experienced large tsunami during the past few thousand years.This evidence is revealed through anomalous sedimentary deposits (such as those containing shell or coral) or other geomorphic features (Dominey Howes, 2007; Goff and Chauge-Goff, 2014).Until recently, tsunami were called tidal waves, but this term is generally discouraged because tsunami generation has nothing to do with tides (which are driven by the gravity of the Earth, Moon and Sun).Although some tsunami may appear like a rapidly rising or falling tide at the coast, in other situations they can also feature one or more turbulent breaking waves.Tsunami (pron: 'soo-nar-me') is a Japanese word: 'tsu' meaning harbour and 'nami' meaning wave.Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.Once unleashed, these natural disasters could become deadly.One of nature's tremendous natural disasters is the great waves of the mighty ocean.Equipped with these sea level data and the Bureau of Meteorology's tsunami modeling, specially trained JATWC staff then issue a warning that is in keeping with the determined threat level.These warnings identify affected coastal regions, initial tsunami arrival times and whether the tsunami threat is to land or marine areas.