MARGINS: Collaborative Research: Illuminating the Architecture of the Greater Mount St. Helens Magmatic System from Slab to Surface

为了更好地了解火山活动，准确地描述地球上-S地壳和上地幔的岩浆产生带和储存区是至关重要的。阐明火山下方管道系统的结构将使科学家能够确定(1)岩浆产生的深度和条件，以及(2)岩浆向地表流动的路径和水库的形状和大小。这些知识将使科学家能够对火山危机的持续时间和喷发期间的喷发物质总量做出更有见地的预测。这个项目集中在美国华盛顿州的圣海伦斯火山大厦，它在1980年的爆发引起了世界？S的关注，也是第一座用现代仪器彻底监测的火山。圣海伦斯火山提供了一个理想的环境，可以应用最先进的地球物理和地球化学技术来成像其地下根：它很活跃，很容易到达，并且有很好的过去历史记录。该项目将使用几种不同的方法(主动和被动震源地震层析成像和散射波成像、大地电磁成像、岩石学和地球化学)，涉及一个大型合作团队，以前所未有的分辨率对S火山管道系统进行成像，从俯冲板块到地表。这一结果将为世界各地的许多其他火山提供信息，特别是那些位于臭名昭著的太平洋火环沿线的火山。

To better understand volcanic activity, it is fundamental to get an accurate representation of magma generation zones and storage regions in the Earth?s crust and upper mantle. Illuminating the architecture of the plumbing system beneath volcanoes will allow scientists to determine (1) at which depths and conditions magmas are generated, and (2) the shapes and sizes of pathways and reservoirs along which magma travels towards the surface. Such knowledge will allow scientists to make more informed predictions on the durations of volcanic crises and on the total volume of erupted material during eruptive episodes.This project focuses on the Mount St. Helens volcanic edifice, (WA, USA), whose explosive eruption in 1980 attracted world?s attention, and was the first volcano to be thoroughly monitored with modern instruments. Mount St. Helens provides an ideal setting to apply state-of-the-art geophysical and geochemical techniques to image its subterranean roots: It is active, easily accessible, and has a well recorded past history. The project will use several different methods (active and passive source seismic tomography and scattered wave imaging, magnetotelluric imaging, petrology and geochemistry), involving a large collaborative team, to image the volcano?s plumbing system with unprecedented resolution from the subducting plate to the surface. The results will be informative for many other volcanoes around the world, particularly those located along the infamous Pacific Ring of Fire.