The family of an Australian man killed in the New Zealand volcanic eruption have questioned whether he would have gone to White Island if he was aware of the risks.

Gavin Dallow is one of seven Australians confirmed killed in Monday’s eruption, with one other still listed missing presumed dead and two Sydney families unaccounted for.

Mr Dallow, 53, was confirmed dead on Wednesday, while his family said his step-daughter, 15-year-old Zoe Hosking, was presumed dead on White Island.

Brisbane mother and daughter Julie and Jessica Richards were also named as victims by their family who remembered them as an adventurous pair who loved the outdoors.

And the loss of three friends from Coffs Harbour – Karla Matthews, Richard Elzer and Jason Griffiths – was confirmed by their travelling companions late Wednesday night.

“We are incredibly saddened to have lost three of our closest friends,” their friends Alex, Daniel, Ellie, Leanne, Paul and Samantha said in a statement issued by the Department of Foreign Affairs and Trade.

Mr Griffiths died in hospital after suffering burns to 80 per cent of his body in Monday’s eruption while Ms Mathews and her partner Mr Elzer are among eight bodies believed still on the island where authorities say there is no sign of life.

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New Zealand police have also listed Victorian woman Krystal Browitt as missing on the island.

All had taken a tour of White Island while on a cruise on the liner Ovation of the Seas which was moored 50km away on New Zealand’s North Island.

Mr Dallow’s father Brian questioned if his son knew of the risks of visiting the island, home to New Zealand’s most active volcano.

“Gavin was always one for being fairly articulate on what he did,” Brian Dallow said on Wednesday.

“So, I think if he had known there was a danger he wouldn’t have gone on it.

“I’m pretty well sure they weren’t fully informed of the danger.”

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New Zealand authorities will examine whether the White Island tour company were aware of any dangers or increased risks of an eruption.

Mr Dallow’s 48-year-old wife and Zoe’s mother, Lisa Dallow, remains in a critical condition in Hamilton with serious burns.

She is one of around a dozen Australians in New Zealand hospitals who the RAAF will try to transfer home for treatment on Thursday.

Many have critical injuries suffered in the intense heat and toxicity of the ash and volcanic gas from the eruption.

Friend John Mickel said the family of Ms Richards, 47, and Jessica, 20, were “united in grief”.

“The family have asked me to describe Julie and Jess as being outdoor, adventurous people … if there was an adventure that offered itself, then they would go,” he said.

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Fears are also held for the Hollander and Langford families from Sydney.

Martin and Barbara Hollander and their sons Berend and Matthew have not been heard from and nor have Anthony and Kristine Langford and their daughter Winona, 17. Their son Jesse, 19, has reportedly been identified as one of those being treated in hospital.

AAP.