Tsunami Risk in Australia: Historical Events and Frequency

Tsunamis are rare but not unknown in Australia. Geoscience Australia records four significant tsunamis (1–7 m run-up) affecting the continent in the last 500 years:

Historical Events

1. 1851–52 – Multiple waves from a massive earthquake off Peru; impacted NSW, Victoria, Tasmania coasts.
2. 1897 – Source uncertain; recorded on tide gauges in Sydney, Fort Denison.
3. 22 May 1960 – Chilean M9.5 earthquake (largest ever recorded); waves up to 1.5 m in NSW, Victoria, Tasmania; boats damaged in Sydney Harbour.
4. 19 May 1979 – M7.9 earthquake near Vanuatu; waves up to 1.8 m on NSW north coast; minor damage.

Since European Settlement (1788)

Only the 1851–52 and 1979 events caused notable damage. No fatalities have been recorded on the Australian mainland from tsunamis.

Risk Profile

• Source zones: Puysegur Trench (south of NZ), Kermadec-Tonga Trench, New Hebrides (Vanuatu), Solomon Islands, Java Trench, South American margin.
• Travel time: 2–6 hours from nearest sources; 12–18 hours from South America.
• Warning system: Joint Australian Tsunami Warning Centre (JATWC) – Bureau of Meteorology + Geoscience Australia. Issues watches/warnings via media, Emergency Alert, website.

Preparedness

Coastal communities have evacuation maps and signage. The main risk is to marine users (boats, harbors, rock fishers) and low-lying coastal infrastructure. For most Australians, tsunami risk is very low compared to bushfire, flood, or cyclone.

Bottom line: Australia is not a high-risk tsunami zone, but it is not immune. The system is monitored, and warnings are effective.