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

这项博士后奖学金授予罗斯·马奎尔博士，他在新墨西哥大学和密歇根州立大学从事一个项目，该项目将开发黄石公园地下表面的新的详细3D图像。这张照片将阐明火山系统的新方面，这可能会让人们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地区坐落在64万年前一次灾难性火山喷发期间形成的火山口内。今天，地质活动显示出黄石超级火山处于动荡状态的迹象，但未来是否会爆发仍是个未知数。对黄石超级火山当前状态的关键洞察依赖于使用地球物理技术对地下进行成像。其目的是验证在地壳浅层存在一层可喷发岩浆层的假设。该项目将使用最近开发的地震成像技术，这将使地下细节的分辨率比以前可能的更高。黄石公园地下的3D模型将在网上公开提供，这将为公众宣传和教育火山灾害提供一个极好的机会。丰富的地震数据集的日益丰富的可用性，以及使用地震噪声和横波的地震成像技术的最新进展，为成像黄石岩浆系统提供了一个难得的机会。该项目将根据环境噪声干涉测量和当地地震记录，开发黄石公园地下的高分辨率剪切波速模型，目的是识别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岩浆系统中熔体的性质和分布，并深入了解熔体的形成过程及其与岩石圈的相互作用。这项工作中使用的改进的成像技术将允许测试黄石之下存在具有喷发潜力的熔体富集区的假设。更广泛的影响包括通过黄石国家公园将结果传播给他们的众多参观者。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.