Constraining Asthenospheric and Lithospheric Seismic Structure along the Yellowstone Hotspot

黄石热点对软流圈和岩石圈地震结构的约束美国国家科学基金会网站简介黄石热点是大陆上地幔对流最深刻的现象之一。虽然在过去的30年里，在黄石公园进行了大量的地球物理工作，但关于这个“火锅”产生的上地幔和地壳变化，仍然存在几个重要的问题。我们提出了一个重点项目，利用最近pascal宽带实验中热点的出色宽带地震覆盖来研究：1)热点如何影响大块地壳速度和厚度；2)热点如何改变岩石圈和岩石圈-软流圈边界。该分析将包括两个子项目。首先，采用最近邻定向蒙特卡罗算法对200 km以上的速度和不连续结构进行联合Pds、Sdp和面波相速度反演。其次，利用最近邻算法反演交叉卷积震源归一化的direct-S和SKS地震记录以及Pds时间序列，完成深度相关各向异性分析。提出的研究促进发现和理解，同时促进教学，培训和学习。它通过资助一名博士研究生和一名新的硕士生一年来促进教育。随着我们对所提出的分析技术的经验的积累，我们的研究基础设施将得到加强。为黄石热点提供新的和更好的约束是地球科学界关注的一个全球性问题。为了传播我们的结果，我们打算及时公布我们的结果，并在网上公布我们的结果。

Constraining Asthenospheric and Lithospheric Seismic Structure along the Yellowstone Hotspot Synopsis for NSF websiteOne of the most profound continental upper mantle convective phenomena is the Yellowstone Hotspot. While substantial geophysical work has been done on Yellowstone over the last 30 years, several important questions remain with respect to the upper mantle and crustal modifications produced by this Hotpot.We propose a focused project that capitalizes on the excellent broadband seismic coverage of the Hotspot from a recent PASSCAL broadband experiment to examine: 1) how the Hotspot has affected bulk crustal velocities and thickness; 2) how the Hotspot has modified the lithosphere and lithosphere-asthenosphere boundary. The analysis will consist of two sub-projects. First, joint Pds, Sdp, and surface wave phase velocity inversion for velocity and discontinuity structure of the upper 200 km will be performed using a nearest neighbor directed Monte-Carlo algorithm. Second, depth dependent anisotropy analysis will be accomplished using the nearest neighbor algorithm to invert cross-convolved source normalized direct-S and SKS seismograms and Pds time-series. The proposed research advances discovery and understanding while promoting teaching, training and learning. It promotes education by funding a Ph.D. level graduate student and a new Master's student for one year. Our research infrastructure will be enhanced as we gain experience with the analysis techniques proposed. Providing new and better constraints on the Yellowstone hotspot is a global issue of concern to the Earth science community. To disseminate our results we intend to publish our results in a timely manner and post our results on the web.