Authorities have estimated 60 per cent of North Stradbroke Island has been destroyed by a bushfire sparked by lightning a week ago.

But with no lives or property lost, firefighters battling the blaze in potentially catastrophic heat have won widespread praise.

The fire burning on North Stradbroke Island near the township of Dunwich on Monday morning. Photo: Penny Dahl, Australian Traffic Network, via Twitter.

Thick smoke continues to blanket the area, as well as the Sunshine Coast, South Burnett and Southern Moreton Bay Island.

On Sunday an elderly Russian tourist was evacuated by air ambulance from South Stradbroke Island due to smoke inhalation.