How can warning systems and lead time affect the level of risk from volcanic eruptions and tsunamis?
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Early warning systems are combinations of tools and processes embedded within institutional structures, coordinated by international — and sometimes national — agencies. Whether they focus on one particular hazard or many, these systems are composed of four elements: knowledge of the risk, a technical monitoring and warning service, dissemination of meaningful warnings to at-risk people, and public awareness and preparedness to act. Warning services lie at the core of these systems, and how well they operate depends on having a sound
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