Collocations for migration - noun

seasonal
the seasonal migration of birds

autumn (esp. BrE), fall (AmE), spring
annual
internal, inward (esp. BrE)
urban
The decline of the rural economy has caused urban migration.

international
large-scale, mass
bird
northward, southward, etc.
forced
the forced migration of African slaves

illegal

wave
the great waves of migration that took Europeans to the New World

occur, take place
increase
begin

path, pattern, route
changes in the migration routes of reindeer

migration from, migration to
migration from rural to urban areas