Tsunami warning explained: what is a marine threat, land threat, BoM Bureau of Meteorology notice

the Warning spans Queensland, New South Wales, Victoria and Tasmania, as well as Lord Howe, Norfolk and Macquarie Islands.

The BoM says the size of the waves means the threat is to the marine environment, but there is potential for land-based impact on Lord Howe Island and Norfolk Island.

What is a Marine Warning?

No danger this is when an undersea earthquake has been detected, but it has not generated a tsunami, or the tsunami does not threaten Australia and its offshore territories.

Immediate marine and foreshore threat is a warning of potentially dangerous rips, waves and strong ocean currents in the marine environment and the possibility of localized overtopping on the immediate foreshore.

Threat of land flooding is a warning for low-lying coastal areas of major overland flooding, flooding, dangerous rips, waves and strong ocean currents.

Satellite image taken by Himawari-8 shows an underwater volcanic eruption in the peaceful nation of Tonga. (AP)

How often do tsunamis occur?

Tsunamis are recorded in Australia about once every two years, according to the BoM.

“Most are small and pose little threat of land flooding to our coastal communities.

“However, abnormal waves, tides and currents caused by even a relatively small tsunami can be dangerous to swimmers and sailors.”

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