High Resolution Tomographic Inversion for P-Wave Velocity Structure at Mt. St. Helens, Washington, Using Local Earthquake Data

这项研究旨在利用层析成像技术来确定山下的地下结构。圣海伦斯，分辨率非常高(大约100米)。通过使用5000个以前没有使用过的地震，将确定一个三维速度模型，然后可以用它来提高地震地点的空间分辨率。重力、航磁和衰减数据将被用来约束构造解。这项工作的一个目标将是区分不同的管道系统模型，这些模型相互冲突，用于将岩浆输送到地表。由于这项工作有可能增加对主要梯级山脉直射火山岩浆运移与地震活动相互作用的了解，因此它已应用于国家防震减灾计划。

This research is to use tomographic imaging techniques to determine the subsurface structure beneath Mt. St. Helens at a very high resolution (on the order of 100 meters). By the use of 5000 previously unused earthquakes, a three dimensional velocity model will be determined which can then be used to improve the spatial resolution of earthquake locations. Gravity, aeromagnetic and attenuation data will be used to constrain the structural solution. A goal of the work will be to distinguish between conflicting models of the plumbing system for the transport of magma to the surface. Because this work has the potential for increasing the understanding of the interaction of magma transport and seismicity for the major Cascade range strato-volcanos, it has application to the National Earthquake Hazard Reduction Program.