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学信息，这将使他能够量化有多少热量流出地球？的核心和地幔。热量的流动决定了行星在一段时间内的行为。这包括驱动板块构造，产生热点地幔柱，制造地震和火山，以及通过俯冲带循环水。虽然我们可以测量有多少热量从地球流出并进入太空（以46太瓦的速度），但我们仍然不知道有多少热量是由地壳和地幔内的放射性产生的，以及有多少热量从地核进入地幔。这个项目将有助于（结合矿物物理学家的研究）来计算从核心出来的热量，结果，也限制了地球内部放射性产生的热量。PI建议使用30多年全球岩心地震数据的合成地震图建模，对地幔底部的垂直速度结构进行调查。衍射P波和S波（Pdiff，Sdiff）。这些研究将有助于计算从地核到地幔的总热流率和区域热流率，并为回答有关地幔地球动力学的主要问题提供基础，包括地幔对流系统的动力、俯冲后地幔岩石圈在地幔底部的停留时间、地核磁-地发电机的动力、地幔柱的产生、以及核幔边界区热边界层结构中大的低剪切速度区的动力学作用。我们的工作还将涉及通过与科学中心、学校和教科书公司合作开发教育材料和课程。