A variety of community currency schemes have been implemented in Japanese disaster areas as a community-based tool to facilitate the revival of disaster-affected communities after the 2011 Great East Japan Earthquake. One of the key variables in the recovery of these disaster-affected communities is the restoration of disaster survivors' subjective mental health conditions, yet little is known about how subjective mental health coevolves with the supportive connections emerging in the postdisaster stages. Using stochastic actor-based modelling, we show that social capital, referring to postdisaster emergent social support networks and broader engagement, not only helped 101 disaster victims overcome the mental impacts of the disaster but also empowered them to provide social support to others. However, a dilemma emerged regarding the greater engagement of residents with poor psychological statuses in supportive networks during postdisaster recovery periods, which led to differential and detrimental impacts on initially mentally healthier residents’ conditions through the contagion mechanism.

在日本灾区，已实施了多种社区货币计划，将其作为一种基于社区的工具，以促进2011年东日本大地震后受灾社区的复兴。这些受灾社区恢复的关键变量之一是灾难幸存者的主观心理健康状况的恢复，但是人们对主观心理健康与灾难后阶段出现的支持联系如何演变知之甚少。使用基于随机参与者的建模，我们表明，社会资本，指的是灾后紧急的社会支持网络和更广泛的参与，不仅帮助101名灾难受害者克服了灾难的精神影响，而且使他们有能力向其他人提供社会支持。然而，