Global Volcano Hazard Frequency and Distribution is a 2.5 by 2.5
minutegridded data set based upon the National Geophysical Data
Center (NGDC)Volcano Database spanning the period 79 through 2000.
This databaseincludes 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 adegree with a few to the nearest
thousandth of a degree. To produce thefinal output, the frequency of
a volcanic hazard is computed for eachgrid cell, with the data set
consequently being classified into deciles(10 classes of
approximately equal number of grid cells). The higher thegrid cell
value in the final output, the higher the relative frequencyof
hazard posed by volcanoes. The dataset is a result of the
collaboration among the Center for Hazards and Risk Research (CHRR) ,
and the Columbia University Center for International Earth Science
Information Network (CIESIN).