Ocean waves are a powerful force in the lives of New Zealanders. We like to surf them and swim in them – yet we are also vulnerable to the power of ocean waves. In particular, coastal New Zealand is at high risk of inundation by a tsunami.
Several tsunamis – particularly those in South-east Asia (2004), Samoa (2009) and Japan (2011) – have focused attention on the destructive power of these waves. New Zealand researchers are actively working to understand how a large tsunami would affect our coast.
For all their destructiveness, tsunamis share many features with surf waves and other water waves. In fact, waves of all kinds (such as water waves, sound waves and electromagnetic radiation) share several fundamental characteristics that can help us understand why they behave the way they do.
Find out about the similarities and differences between tsunamis and surf waves, and learn how ocean waves are studied in New Zealand, how early Māori used ocean waves as a guide to navigate across the Pacific and why you should never try to surf a tsunami.
Take up the challenge
Student activities include:
- using a Mexican wave to demonstrate how waves transfer energy and to help your students visualise the wave behaviours of reflection, constructive interference and shoaling.
- using an interactive or paper-based Venn diagram to illustrate the key similarities and differences between tsunami waves and surf waves.
- using a shallow tray of water to demonstrate wave generation and behaviour.