Disaster response systems (DRS) operate in an uncertain environment and are continuously tested by external perturbations and internal failures. The ability to withstand disruptions and mitigate the risk of structural disintegration is a defining aspect of a resilient DRS. The current research on the resilience of DRS aims to reveal its robustness performance using metrics from social network analysis. However, the correspondence between these metrics and the underlying ability to maintain structural integrity is neither direct nor well-established. In this paper, we first construct faithful representations of DRS using hypergraph modelling. We demonstrate that hypergraph-based representations provide a principled basis for robustness analysis, revealing local structures key to structural integrity. We establish comprehensive robustness metrics and introduce a principled analysis framework to formalise these key local structures. We also perform a stability decomposition and obtain stability indicators that are used to identify the unstable local structures with weak internal coherence and fragile external embedding. Then we formulate the robustness-enhancing problem and develop fortification methods aiming at maximising the total robustness gain. Extensive simulations demonstrate that our approach substantially outperforms alternative strategies, including coreness-based and graph-based methods, across a wide range of fortification budgets. In addition, the proposed method has an efficient numerical implementation, and we validate it in large-scale synthetic hypergraphs.
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