Constraining Asthenospheric and Lithospheric Seismic Structure along the Yellowstone Hotspot

黄石热点地区的软流圈和岩石圈地震结构的约束

• 批准号: 0440432
• 负责人: Kenneth Dueker
• 金额: $ 5.07万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440432&HistoricalAwards=false
• 关键词: Constraining; Asthenospheric; Lithospheric; Seismic; Structure

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.

约束黄石热点沿线的软流圈和岩石圈地震结构 NSF 网站概要 最深刻的大陆上地幔对流现象之一是黄石热点。 虽然过去 30 年在黄石公园进行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变化仍然存在几个重要问题。我们提出了一个重点项目，该项目利用了热点的出色宽带地震覆盖最近的 PASSCAL 宽带实验旨在检查：1）热点如何影响整体地壳速度和厚度； 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，将使用最近邻定向蒙特卡罗算法对上部 200 km 的速度和不连续结构进行联合 Pds、Sdp 和表面波相速度反演。其次，将使用最近邻算法来完成与深度相关的各向异性分析，以反演交叉卷积源归一化直接 S 和 SKS 地震图以及 Pds 时间序列。 拟议的研究促进发现和理解，同时促进教学、培训和学习。 它通过资助博士学位来促进教育。级别研究生和新硕士研究生为期一年。 随着我们在所提出的分析技术方面获得经验，我们的研究基础设施将得到加强。对黄石热点地区提供新的、更好的约束是地球科学界关注的全球性问题。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。