'outward migration' is correct and usable in written English.
You can use the phrase to talk about people who have left a place to live elsewhere. For example: "The country has experienced an extensive pattern of outward migration over the last decade."
One factor not to be overlooked is outward migration.
In the postwar years, before Newark's outward migration began, Weequahic High School was consistently ranked among the best in America.
Outward migration has slowed since the 2008 economic crisis as job prospects dimmed in the United States and the border became increasingly fortified.
San Francisco experienced a dramatic increase in eviction rates, rental prices and outward migration following the birth of Tech Boom 2.0 back in 2011.
That speaks of an ugly truth: while outward migration to towns plays its part, a punishing mortality rate among men has devastated places such as Rybaki.
Lowering the quality and increasing the cost of educational and health services will encourage the outward migration of the young, the bright, the entrepreneurial and the able.
One recent prediction is that, in contrast to the pattern of recent years, this year could see a net outward migration of around 50,000.
Ireland now has its highest outward migration since 1989.Australia is also a magnet for young Chinese, the largest group of immigrants in 2010.
Outward migration and an estimated 250,000 deaths have caused Syria's population to fall by more than 15 per cent, from 21 million to 17.5 million.
But the main concern raised repeatedly by the government of Somaliland is not the influx of young people into Somaliland but the the outward migration of its young graduates.
A flexible labour market and a long tradition of emigrating to find work facilitated the transition – net outward migration since 2008 has been greater proportionately in Ireland than in Greece despite unemployment being much higher in the Aegean state.
