Mapping the Middle of the Mantle-Core Dynamic

PI提议提供关于最低地幔的地震学信息，使他能够量化从地球流出的热量？S核心和进入地幔。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，产生热点地幔热柱，创造地震和火山，以及在俯冲带循环水。虽然我们可以测量流出地球和进入太空的热量(以46太瓦的速率)，但我们仍然不知道地壳和地幔内的放射性产生了多少热量，以及有多少热量从地核进入地幔。这个项目将帮助(结合矿物物理学家的研究)计算从地核出来的热量，因此也将限制地球内部由放射性产生的热量。PI建议利用30年全球岩心绕射P波和S波(Pdiff，Sdiff)的合成地震记录模拟来研究地幔底部的垂直速度结构。这些研究将能够计算从核心进入地幔的总热流率和区域热流率，并为回答有关地幔动力学的主要问题奠定基础，这些问题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、核心磁力发电机的动力、地幔羽流的产生以及大的低剪切速度省在核心地幔边界区域热边界层结构内的动力作用。我们的工作还将包括通过与科学中心、学校和教科书公司建立伙伴关系来开发教材和课程。

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.