Imaging the Yellowstone magmatic system with ambient noise and local earthquake waveforms

这个博士后奖学金被授予博士罗斯马奎尔工作在新墨西哥州和密歇根州立大学的一个项目，将开发一个新的详细的3D图像的地下黄石。该图像将阐明火山系统的新方面，可以深入了解黄石公园的喷发潜力。位于怀俄明州西北部的黄石国家公园的大部分坐落在一个破火山口内，该破火山口是在64万年前的一次灾难性火山爆发中形成的。今天，地质活动表明黄石超级火山处于动荡之中，但未来是否会爆发仍是未知数。对黄石超级火山现状的关键洞察力依赖于用地球物理技术对地下进行成像。其目的是检验地壳浅层存在一层可喷发岩浆的假设。该项目将使用最近开发的地震成像技术，这将使分辨率在一个更精细的尺度细节在地下比以前可能。黄石公园地下的3D模型将在网上公开提供，并将为公众宣传和火山灾害教育提供一个极好的机会。丰富的地震数据集的增加，结合地震成像技术的最新进展，使用地震噪声和剪切波提供了一个特殊的机会，成像黄石岩浆系统。该项目将根据环境噪声干涉测量法和当地地震记录，开发黄石公园地下的高分辨率剪切波速度模型，目的是查明黄石火山口下地壳中的岩浆体。我们的绝对Vs波速模型将被用来推断黄石公园的岩浆系统中熔体的性质和分布，并深入了解熔体生成和与岩石圈相互作用的过程。在这项工作中使用的改进的成像技术将允许测试的假设，一个熔融丰富的区域与喷发的潜力是目前黄石公园。更广泛的影响包括通过黄石国家公园向众多游客传播研究结果。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This postdoctoral fellowship is awarded to Dr. Ross Maguire to work at the University of New Mexico and Michigan State University on a project that will develop a new detailed 3D image of the subsurface beneath Yellowstone. The image will illuminate new aspects of the volcanic system that could provide insight into the eruptive potential of Yellowstone. Much of Yellowstone National Park in northwest Wyoming sits in a caldera that formed during a cataclysmic volcanic eruption 640 thousand years ago. Today, geological activity shows signs that the Yellowstone supervolcano is at unrest, but it is still unknown if a future eruption could occur. Key insight into the current state of Yellowstone supervolcano relies on imaging the subsurface with geophysical techniques. The aim is to test the hypothesis that a layer of eruptible magma is present at shallow crustal depths. The project will use recently developed seismic imaging techniques that will allow resolution at a finer scale detail in the subsurface than has been previously possible. The 3D model of the subsurface beneath Yellowstone will be made openly available online and will provide an excellent opportunity for public outreach and education about volcanic hazards. The increased availability of rich seismic datasets combined with recent advances in seismic imaging techniques using both seismic noise and shear waves provides an exceptional chance to image the Yellowstone magmatic system. The project will develop a high-resolution shear wavespeed model of the subsurface beneath Yellowstone based on both ambient noise interferometry and local earthquake records with the aim of identifying magma bodies in the crust beneath Yellowstone caldera. Our model of absolute Vs wavespeed will be used to infer the properties and distribution of melt in Yellowstone's magmatic system and to gain insight into processes involved in melt generation and interaction with the lithosphere. The improved imaging technique used in this work will allow testing of the hypothesis that a melt rich zone with eruptive potential is present beneath Yellowstone. Broader impacts include dissemination of the results through Yellowstone National Park to their multitude of visitors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.