Serious natural disasters and traumatic events, such as earthquake and tsunami, not only directly threaten health of survivors, but also indirectly affect their psychological and social functions through destroying the established social relationship and social network. The effect of social network on mental health is often exhibited in two respects. (1) Structural effect of social network, which means that one person's mental health is affected by the properties and structures of relationship network which he or she embedded in. These structural properties of social network include, for example, scale of network, individual centrality and whole centrality of social network and reciprocity of relationship. (2) Spread effect of social network, which means that mental health status of one person affect that of another one by relationship tie between them, which further lead the spread of mental health across network ties. There are three mechanisms are used to explain this spread effect: induction, homophily and shared environment. Using the post-disaster newly built neighborhoods and common neighborhoods as whole social networks, and sampling the residents who have settled in these neighborhoods as network ties, the current project aims to examine the interaction of mental health and relationship network by cross
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