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.

沿着黄石热点的软流圈和岩石圈地震结构的约束黄石热点是最深刻的大陆上地幔对流现象之一。 在过去的30年里，人们对黄石公园进行了大量的地球物理研究，但仍有一些重要的问题有待解决。我们提出了一个有针对性的项目，利用最近PASSCAL宽带实验中的热点地震覆盖率来研究：1）热点如何影响地壳的速度和厚度;（2）热点对岩石圈和岩石圈-软流圈边界的改造作用。分析将包括两个分项目。首先，联合Pds，Sdp和面波相速度反演速度和不连续结构的上部200公里将使用最近邻直接蒙特-卡罗算法。其次，将使用最近邻算法来反演交叉卷积的源标准化的直接S和SKS地震图和Pds时间序列来完成深度相关的各向异性分析。 拟议的研究推进发现和理解，同时促进教学，培训和学习。 它通过资助一个博士来促进教育。研究生和一名新的硕士生一年。 我们的研究基础设施将得到加强，因为我们获得的经验与分析技术的建议。对黄石热点提供新的和更好的限制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。