Mapping the Middle of the Mantle-Core Dynamic

绘制地幔核动力中部图

• 批准号: 1520872
• 负责人: Michael Wysession
• 金额: $ 37.5万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1520872&HistoricalAwards=false
• 关键词: Mapping; Middle; Mantle; Core; Dynamic

The PI proposes to provide the seismological information about the lowermost mantle that will allow him to quantify how much heat is flowing out of Earth?s core and into the mantle. The flow of heat determines how a planet behaves over time. This includes driving plate tectonics, generating hotspot mantle plumes, creating earthquakes and volcanoes, and cycling water through subduction zones. Though we can measure how much heat flows out of Earth and into space (at a rate of 46 terawatts), we still do not know how much heat is generated by radioactivity within the crust and mantle and how much passes into the mantle from the core. This project will help (combined with the research of mineral physicists) to compute the heat coming out of the core, which will, as a result, also constrain how much heat is generated within the earth by radioactivity.The PI proposes to carry out an investigation of the vertical velocity structure of the base of the mantle using synthetic seismogram modeling of 30+ years of global seismic data of core-diffracted P and S waves (Pdiff, Sdiff). These investigations will allow for calculations of the total and regional heat flow rates from the core into the mantle and provide foundations for the answers to major questions about the geodynamics of the mantle, including the power for the mantle convection system, the residence time of post-subduction mantle lithosphere at the base of the mantle, the power for the core magneto-geodynamo, mantle plume generation, and the dynamic role of large low-shear-velocity provinces within the thermal boundary layer structure of the core mantle boundary region. Our work will also involve the development of educational materials and curricula through partnerships with science centers, schools, and textbook companies.

PI建议提供有关最低地幔的地震信息，这将使他能够量化多少热量流出地球核心并进入地幔。热量的流动决定了行星随着时间的流逝的行为。这包括驾驶板构造，产生热点地幔羽，形成地震和火山以及通过俯冲带骑自行车的水。尽管我们可以测量多少热量流出地球并进入太空（以46吨的速度），但我们仍然不知道地壳和地幔中的放射性产生了多少热量，以及从核心传递了多少热量。该项目将有助于（结合矿物物理学家的研究）来计算核心的热量，结果，这也将通过放射性来限制地球内部产生的热量。 SDIFF）。这些研究将允许计算从核心到地幔的总和区域热流速，并为地幔的主要问题提供基础，包括地幔的地球动力学，包括地幔对流系统的能力，后增生后地幔岩石圈的停留时间核心地幔边界区域热边界层结构内的低剪切速度省。我们的工作还将通过与科学中心，学校和教科书公司的合作伙伴关系来开发教育材料和课程。