The new underwater search for MH370 will focus on a 60,000 square kilometre area - compared to the 860km searched below the surface so far.
The new phase will have two elements - firstly the mapping of the sea floor, followed by a comprehensive search.
The mapping will take around three months to complete, Australian Deputy Prime Minister Warren Truss said, but will give "crucial" information for later search efforts, due to start in August.
More top news
The much-loved local character, who had lived on the city's streets for decades, died in hospital this week after falling ill.
Man City remain five points behind Chelsea in the Premier League title race after a 1-1 draw at Stamford Bridge
Five NHS trusts in the Midlands have come under fire after it emerged bosses were sitting on more than £134 million of spare cash.