Global database of volcanic ash layers

几十年来，海洋钻探计划对世界各地的海底沉积物进行了采样。当一次大的火山爆发发生时，一层火山灰沉积在海底，这层火山灰可能会保存在岩芯中。因此，地核包含了地球火山活动的记录，通常可以追溯到数百万年前。到目前为止，还没有全球火山灰层数据汇编，这是该项目的主要目的。这一全球火山灰层数据库将为对全球和区域火山活动速率感兴趣的研究人员以及确定海洋钻探岩心的时间范围年龄提供重要资源。

The ocean drilling programme has over the course of several decades sampled sea floor sediment around the World. When a major explosive volcanic eruption happens a layer of volcanic ash deposits on the sea floor and this layer may be preserved in the cores. Thus the cores contain a record of the Earth's volcanic activity often extending back many millions of years. Up to now there is no global compilation of the data on volcanic ash layers and this is the primary purpose of this project. This global database of volcanic ash layers will provide a critical resource for researchers interested in global and regional rates of volcanism and for establishing the age of time horizons in ocean drilling cores.