Impact on Communities Seismic Activity Air Quality Hazards Iceland Tsunamis Pyroclastic Flows Ashfall Lava Flows Gas Emissions Lewotobi Laki-Laki Mount St. Helens Mount Lewotobi Laki-laki Volcanic Ash Impact on Aviation Icelandic Eruptions Impact on Tourism Housing Issues Historical Events Hawaiian Volcanoes Iceland Eruptions Evacuations Erosion Immediate Impact Climate Effects Monitoring Safety Risks Safety Regulations Tourist Risks Mount Vesuvius Lava Flow UNESCO World Heritage Sites Shiveluch Volcano Monitoring Techniques Safety Hazards Impact on Air Travel Impact on Ecosystems Hazard Evaluation Mount Kilauea Fissure Eruptions Eruptive Activity Impact on Surroundings Impact on Society Volcanology