Tsunami disasters pose a serious and recurring threat to coastal and island communities. When a large earthquake occurs, people are forced to make evacuation decisions under extreme time pressure, often at the same time as the communication infrastructure is damaged or completely lost. In such circumstances, the familiar channels for sharing information - cellular networks, the internet, and even landlines - can no longer be relied upon. What typically remains are the mobile devices that evacuees carry with them. These devices can form Delay Tolerant Networks (DTNs), in which messages are forwarded opportunistically whenever people come into contact. To explore this, we evaluate multi-criteria performance characteristics of two DTN routing schemes in a pre-tsunami evacuation scenario for the island of Hachijojima, Japan use case.

翻译：海啸灾害对沿海及岛屿社区构成持续且严重的威胁。当强震发生时，民众必须在极短时间内做出疏散决策，而此时通信基础设施往往已遭破坏或完全中断。在此类情境下，常规信息共享渠道——蜂窝网络、互联网乃至固定电话——均可能失效。通常仅存的是疏散者随身携带的移动设备。这些设备可构成延迟容忍网络（DTN），通过人员接触时的机会性转发实现消息传递。本研究针对日本八丈岛的海啸前疏散场景，评估了两种DTN路由方案（传染病路由与先知路由）的多准则性能特征。