<![CDATA[Disaster preparedness in coastal communities depends not only on individual readiness but also on residents’ shared beliefs in their collective capacity to act. This study examined the association between collective efficacy and community participation in disaster preparedness among residents of Sumur District, Pandeglang, Indonesia — a tsunami-exposed coastline — and explored why shared confidence translates into participation for some residents but not others. An explanatory sequential mixed-methods design was employed: a cross-sectional survey of 175 adults, followed by semi-structured interviews with seven purposively selected respondents representing contrasting quantitative profiles. Data were collected from January to April 2026. Collective efficacy (12 items, α = .91) and community participation (10 items, α = .93) were both moderately high (M = 3.37 and 3.19, respectively, on 5-point scales). Collective efficacy correlated positively with participation, r(173) = .47, p < .001, and remained a significant predictor after demographic and experiential adjustment (β = .46, p < .001; adjusted R² = .24); prior disaster experience was also significant. Approximately 18.3% of respondents showed discordant profiles. Qualitative findings revealed that trust and mutual help facilitated collective action, while coordination, trusted leadership, practical relevance, and schedule accessibility determined whether confidence was translated into participation. Discordant cases highlighted that work and caregiving responsibilities could suppress participation despite high efficacy, whereas personal risk awareness could motivate participation even when collective confidence was lower.]]>
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