Impact on Communities Air Quality Seismic Activity Iceland Hazards Tsunamis Lava Flows Ashfall Pyroclastic Flows Gas Emissions Lava Flow Fissure Eruptions Eruptive Activity Impact on Surroundings Impact on Ecosystems Impact on Society Volcanology 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 Safety Risks Safety Regulations Tourist Risks Mount Vesuvius Monitoring Techniques Impact on Air Travel UNESCO World Heritage Sites Hazard Evaluation Shiveluch Volcano Mount Kilauea