'intense migration' is a correct and usable phrase in written English.
You can use it to describe a situation where a large number of people are moving from one place to another, often in difficult or pressing circumstances. For example: "The ongoing civil war in Syria has resulted in an intense migration of millions of refugees to surrounding countries."
The summer months between the intense migration seasons are an excellent time to learn, according to Glenn Phillips, executive director of New York City Audubon.
Smart collective strategies would surely help the Continent deal with what are likely to be decades of intense migration from the many poor countries in its extended neighborhood.
Intense migration has been observed, especially in rural areas neighboring large cities.
During early postnatal development in the rat, the tissue architecture of the pituitary gland shows changes, revealing an intense migration process of the cells.
Stenning (1957) reports that their spread through gradual migratory drift over many centuries was interspersed with periods of intense migration associated with Islamic holy wars (jihad).
Results of FTIR-ATR spectroscopy showed intense migration of sulphate ions from inked spots to neighbouring ink-free areas at the surface of parchment in both ink formulations, also confirmed by SEM microanalysis results.
Intense migrations from tuberculosis endemic areas to Gulf countries create special risks for people in the region.
During periods of intense glaciation, migration to the ice-covered Bering region would have been impossible.
The eastern portion of the country was the object of intense Spanish migration and hispanicization.
with VTs showed intense leukocyte migration to the peritoneal cavity).
The fast and intense group migration allowed the overall coagulation process to be completed within two minutes.
