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âº a âsituation in which âpeople go to âlive in âforeign countries, especially in âorder to âfind âwork: Most âglobal âmigration is from âdeveloping countries to âdeveloped ones.âglobal âmigration âpatterns. (Definition of global migration from the Cambridge Business English Dictionary Â© Cambridge University Press).ow many is a billion? The answer may seem obvious, but the use of this word can lead to confusion. In the UK and Ireland the word traditionally meant the number 1,000,000,000,000 (a million millions), which is called a trillion in the United States.
From Wikipedia, the free encyclopedia. Seismic migration is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface. form of migration is one of the standard data processing techniques for reflection-based geophysical methods (seismic reflection and ground-penetrating radar). The need for migration has been understood since the beginnings of seismic exploration and the very first seismic reflection data from 1921 were migrated.