Global Volcano Hazard Frequency and Distribution

The Global Volcano Hazard Frequency and Distribution is a 2.5 minute gridded data set based upon the National Geophysical Data Center (NGDC) Volcano Database spanning the period of 79 through 2000. This database includes nearly 4,000 volcanic events categorized as moderate or above (values 2 through 8) according to the Volcano Explosivity Index (VEI). Most volcanoes are georeferenced to the nearest tenth or hundredth of a degree with a few to the nearest thousandth of a degree. To produce the final output, the frequency of a volcanic hazard is computed for each grid cell, with the data set consequently being classified into deciles (10 classes of approximately equal number of grid cells). The higher the grid cell value in the final output, the higher the relative frequency of hazard posed by volcanoes. This data set is the result of collaboration among the Columbia University Center for Hazards and Risk Research (CHRR) and Columbia University Center for International Earth Science Information Network (CIESIN).

全球火山灾害频率与分布数据集是一款2.5弧分钟网格化数据集，其数据源自美国国家地理数据中心（National Geophysical Data Center, NGDC）的火山数据库，时间跨度为公元79年至2000年。该数据库收录了近4000起根据火山爆发指数（Volcano Explosivity Index, VEI）分级为中等及以上（指数2至8）的火山事件。绝大多数火山的地理坐标精度可达0.1度或0.01度，少量坐标精度可达0.001度。为生成最终成果，研究人员为每个网格单元计算了火山灾害发生频率，随后将该数据集按十分位数划分为10个类别，各类别包含的网格单元数量大致均等。最终成果中网格单元的数值越高，代表该区域面临的火山灾害相对发生频率越高。本数据集由哥伦比亚大学灾害与风险研究中心（Center for Hazards and Risk Research, CHRR）与哥伦比亚大学国际地球科学信息网络中心（Center for International Earth Science Information Network, CIESIN）合作完成。