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Activity Space

the space within which daily activity occurs

Chain Migration

migration of people to a specific location because relatives or members of the same nationality previously migrated there


short-term, repetitive, or cyclical movements that recur on a regular basis

distance decay function

The diminishing in importance and eventual disappearance of a phenomenon with increasing distance from its origin.


migration from a location


migration to a location

forced migration

permanent movement compelled usually by cultural factors

voluntary migration

permanent movement undertaken by choice

gravity model

A mathematical formula that describes the level of interaction between two places, based on the size of their populations and their distance from each other.

internal migration

permanent movement within the same country

international migration

permanent movement from one country to another

intervening obstacle

An environmental or cultural feature of the landscape that hinders migration.

migration selectivity

Only people exhibiting certain characteristics in a population choosing to migrate.


the quality of moving freely

net migration rate

the difference between the level of immigration and the level of emigration

push factors

factors that induce people to leave old residences

pull factors

factors that induce people to leave old residences


people who are forced to migrate from thier home country and cannot return for fear of persecution because of thier race, religion, nationality, membership of a social group, of political opinion

interregional migration

movement from one region of a country to another

Awareness Space

knowledge of opportunity locations beyond normal activity space

Critical distance

the distance beyond which cost, effort, and/or means play a determining role in the willingness of the people to travel


an event that results in a displacement or discontinuity


movement into another region or community

Intervening opportunity

The presence of a nearer opportunity that greatly diminishes the attractiveness of sites farther away.


when people leave an area looking for jobs

Space-time prism

The set of all points that can be reached by an individual given a maximum possible speed from a starting point in space-time and an ending point in space-time.

Spatial interaction

the movement of people, goods and ideas within and across geographic space

Step Migration

migration to a distant destination that occurs in stages, for example, from farm to nearby village and later to a town and city


a seasonal periodic movement of pastoralists and their livestock between highland and lowland pastures

Voluntary Migration

Permanent movement undertaken by choice.

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