Australian search and rescue authorities announced Friday they had relocated the search for Malaysia Airlines flight MH370 to an entirely new area after received its most credible lead to date.

The new search area, at 319,000 square km, is about four times bigger than the previous search area in the southern Indian Ocean and 1,100 km to the northeast, according to the Australian Maritime Safety Bureau (AMSA).

It was also just 1,850 km due west of Perth, meaning it was in more moderate seas and closer to the search base so aircraft could spend longer over the area, AMSA and Australian Transport Safety Bureau (ATSB) officials said at a joint press conference in Canberra.

AMSA emergency response general manager John Young said an international air crash investigation team in Malaysia had provided updated advice that had refined the presumed flight path and determined the new area.

"This is our best estimate of the area in which the aircraft has likely crashed into the ocean," said Young.

The key pieces of information related to early positional information from the aircraft the aircraft's "pinging" and later tracking by a satellite of the aircraft system, said ATSB chief commissioner Martin Dolan.

This analysis was combined with data from Boeing about the likely performance, such as speed and fuel consumption, of the Boeing 777 aircraft.

"The new information is based on continuing analysis of radar data between the South China Sea and the Strait of Malacca before radar contact was lost," said Dolan.

"It indicated the plane was traveling faster than previously estimated, resulting in increased fuel usage and reducing the possible distance it traveled south into the Indian Ocean."

The search area was also based on drift modeling from the likely crash point.

The international investigative team would continue their analysis, which could still result in further refinement of the flight path, he said.

"This will remain a somewhat inexact science," said Dolan.

Young said the new search area had two benefits, the first being its closer proximity to Perth.

"We will certainly get better time on the scene. We started nearly 3,000 km from Perth," said Young.

"The other benefit we get from being further north is the search area has moved out of the Roaring Forties, which creates very adverse weather. I'm not sure that we'll get perfect weather out there, but it's likely to be better more often than we've seen in the past and we will see what that does in terms of satellite imagery when the re-tasking of satellites starts to produce new material as well."

Under the international convention relating to air accident investigations, searchers would have to hand over any wreckage retrieved to Australian authorities, he said.

"Any wreckage that is obtained we will hold on behalf of the Malaysian investigation team and await their instructions," said Dolan.

"There are continual discussions with the Malaysians about the progress of the search and we will continue to discuss with them the handling of wreckage as and when it comes to hand," he said.

Ten aircraft have been tasked for Friday's search: two Royal Australian Air Force (RAAF) P3 Orions, a Japanese Coast Guard Gulfstream 5 jet, a Japanese P3 Orion, a Republic of Korea P3 Orion, a Republic of Korea C130 Hercules, a New Zealand air force P3 Orion, a Chinese People's Liberation Army Air Force Ilyushin IL- 76, a United States Navy P8 Poseidon aircraft, and one Australian civil jet acting as a communications relay.

A further Australian P3 Orion had been placed on standby at RAAF Base Pearce in Western Australia to investigate any reported sightings.

Six ships were relocating to the new search area including Australian navy ship HMAS Success and five Chinese ships.

Chinese Maritime Safety Administration patrol ship Haixun 01 was in the search area.

Young said Australian search and rescue authorities were familiar with the Haixun 01 as it had visited Cairns and Sydney last year for multinational exercises.

HMAS Success is expected to arrive in the search area late Saturday night, while a U.S. towed pinger locator and Bluefin-21 Autonomous Underwater Vehicle have arrived in Perth to assist with location and recovery of the black box flight data and cockpit voice recorders.

The depth of the water in the search area is between 2,000 and 4,000 meters. 

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