This study investigates the mechanisms through which collaborative governance between community organizations and residential management bodies enhances tsunami disaster preparedness in coastal urban areas. Drawing on the theoretical lenses of collaborative governance and social capital (bonding and bridging), we analyzed a questionnaire survey conducted with the management entities of buildings designated as tsunami evacuation facilities in Japan. The analysis identifies the "structural triggers" necessary for transitioning from mere structural availability to institutionalized preparedness, defined here as "Planned Tsunami Response." The results reveal that this transition to an organized cooperation framework is significantly influenced by proactive risk communication and formalized information-sharing agreements with neighborhood associations. Decision tree (CART) analysis identified the establishment of emergency information-sharing mechanisms as the most influential factor in triggering institutionalized evacuation management. Despite the limitations of a purposive sample consisting of highly preparedness-aware management bodies, this study demonstrates that the resilience of private residential infrastructure depends on the formalization of inter-organizational dynamics. These findings offer practical lessons for disaster-prone coastal regions worldwide, highlighting that community–management collaboration is a critical strategy for bridging the gap between physical infrastructure and operational disaster response.
Matsumoto et al. (Sun,) studied this question.
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