Global Volcano Hazard Frequency and Distribution

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).

全球火山危害频率与分布数据集是一款基于国家地球物理数据中心（NGDC）火山数据库的2.5分钟网格数据集，该数据库涵盖了79年至2000年间的数据。该数据库中收录了近4000次火山事件，这些事件根据火山爆发强度指数（VEI）被划分为中等强度或以上（数值范围为2至8）。大多数火山的位置被精确到最近的十分之一或百分之一度，少数火山的位置则精确到千分之一度。通过计算每个网格单元的火山危害频率，最终输出结果据此被划分为十等分（约等数量的网格单元分为十类）。最终输出中网格单元的值越高，火山造成的危害相对频率也越高。该数据集是哥伦比亚大学灾害与风险研究中心（CHRR）与哥伦比亚大学国际地球科学信息网络中心（CIESIN）合作的结果。