Influence of Magma Properties on the Dynamics of Explosive Eruptions

该项目将对圣海伦火山普林尼火山喷发产生的浮石瀑布进行地球化学、物理和实验分析。目的是研究喷发动力学变化与岩浆成分、流变学和挥发物含量差异之间的关系。在过去的4000年里，圣海伦火山岩浆储存的变化（如压力、温度、挥发性饱和度）也将被调查和检查，以确定其与喷发动力学变化的相关性。这种综合的物理火山学、岩石学和实际喷发的实验研究将补充理论工作，以更好地了解控制爆炸性火山活动类型及其产物组成的因素。

This project is to carry out geochemical, physical, and experimental analyses of the pumice falls that resulted from plinian eruptions of Mount St. Helens. The objectives will be to examine the relationship between changes in eruption dynamics and differences in magmatic composition, rheology, and volatile content. Changes in the storage of magma (e.g., pressure, temperature, degree of volatile saturation) during the last 4,000 years at Mount St. Helens will also be investigated and examined for correlations to variations in eruption dynamics. This integrated physical-volcanologic, petrologic, and experimental study of actual eruptions will complement theoretical work to better understand the factors which control the style of explosive volcanism and the composition of its products.