Constraining Asthenospheric and Lithospheric Seismic Structure along the Yellowstone Hotspot

制约黄石地区软流圈和岩石圈地震结构美国国家科学基金会网站热点概述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，黄石公园已经完成了大量的地球物理工作，但关于该热点产生的上地幔和地壳修改方面的几个重要问题仍然存在。我们提出了一个重点项目，该项目利用最近PASSCAL宽带实验对该热点的良好宽带地震覆盖范围来研究：1)该热点如何影响整体地壳速度和厚度；2)该热点如何改变岩石圈和岩石圈-软流圈边界。分析将由两个子项目组成。首先，利用最近邻直接蒙特卡罗算法，对200公里以上的速度和不连续结构进行PDS、SDP和面波相速度联合反演。其次，利用最近邻算法对交叉卷积源归一化的直接S和SKS地震记录以及PDS时间序列进行深度各向异性分析。拟议的研究促进了发现和理解，同时促进了教学、培训和学习。它通过资助一名博士水平的研究生和一名新的硕士学生一年来促进教育。随着我们在所建议的分析技术方面积累经验，我们的研究基础设施将得到加强。为黄石公园热点提供新的更好的约束是地球科学界关注的全球问题。为了传播我们的结果，我们打算及时发布我们的结果，并将我们的结果发布在网络上。

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.