A powerful cyclone has pummelled the north-east Australian coast, causing major damage, torrential rain and power cuts to tens of thousands of homes.

Cyclone Debbie made landfall between Bowen and Airlie Beach in Queensland as a category four storm, whipping gusts of up to 263km/h (163 mph).

It is moving inland as a category two but could cause damage for hours yet. One serious injury has been reported.

PM Malcolm Turnbull told parliament he had activated a disaster response plan.

"Conditions have deteriorated rapidly," he said. "Take care and stay safe. Be prepared to shelter in place until Wednesday."

The extent of Cyclone Debbie's devastation, which has a 50km-diameter eye wall, may not be known for some time, authorities said.

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