Volcanic hazards information and assessment systems

Abstract The G-EVER Asia-Pacific region earthquake and volcanic hazards mapping project aims to develop an advanced web-based hazard information system that provides information about past and recent earthquake and volcanic hazards online. The Asia-Pacific Region Earthquake and Volcanic Hazard Information System shows the distribution of Holocene volcanoes, calderas, large-scale ignimbrites, tephra falls, and fatalities in major volcanic events. It also provides information about the distribution of earthquake hypocenters and source regions, tsunami inundation areas, active faults, and fatalities due to earthquake events in an interactive and user-friendly interface. The vector data of the Eastern Asia Earthquake and Volcanic Hazards Information Maps can be displayed and downloaded using the hazard information system. The Volcanic Hazard Assessment Support System (VHASS) aims to provide a user-friendly and Web GIS-based useful tools for potential hazards assessment and risk-mitigation of Quaternary volcanoes in the world. VHASS currently provides three deterministic simulation codes of volcanic processes, which are the Energy Cone, Titan2D, and Tephra2. The area that would be affected by volcanic eruptions can be estimated using the system at any location near the volcano. VHASS is being implemented using the ASTER Global DEM covering 2790 Quaternary volcanoes in the world. The simulation results using Energy Cone and Titan2D are displayed over Google Maps and can be easily downloaded using the system. VHASS can be used to determine volcanic hazard risks by overlaying the distributions of volcanic deposits on major roads, houses, and evacuation areas using Web GIS.