Study on the Process of Behavioral Change of Local Residents in Preparation for a Large-Scale Eruption of Sakurajima

Abstract

We have been working for about three years on collaborative activities between experts and residents aimed at enhancing disaster preparedness against the risk event of the massive fall of pumice and volcanic ash due to a large-scale eruption in Kagoshima City, which is expected to occur within the next few decades due to a major eruption of Sakurajima Volcano. In this study, we identified the behavioral changes of residents observed through collaborative activities undertaken by experts and residents over a long period, using ethnography and individual interviews, and discussed the mechanisms of these changes based on the framework of the theory of planned behavior. As a result, while the specific behaviors arising from collaborative activities were diverse, the behavioral changes could be broadly categorized into two types: “preparing” behaviors that are self-contained and “speaking” behaviors that involve engaging with others. Furthermore, among the survey participants who experienced changes in both “preparing” and “speaking” behaviors, a higher proportion reflected on experiences that stirred emotions such as “gratitude” and “anxiety” as turning points.