Short-Period and Broadband Seismic Investigation of the Core-Mantle Boundary and D"

这项研究涉及到在地核-地幔边界上方的一个特征的映射，这个特征被称为ULVZ（超低速度带）。它是一个薄层（厚度小于40公里），其特征是挤压和剪切速度大大降低，表明它可能部分熔融，可能与上覆的地幔有化学区别。据推测，极低频区是地核热量的有效传送器，是地球发电机的塑造者，也是深层地幔挥发物的潜在储存库。地核-地幔边界ULVZ斑块与地球表面热点火山活动的相关性表明了与羽流成因的联系，特别是该层内部或顶部的不稳定性可能会协调来自深部地幔的热流。到目前为止，已经探测了44%的地核-地幔边界是否存在可探测的超低频辐射。取样的岩心-地幔边界有25%被ULVZ覆盖。这项工作包括将覆盖范围扩大到新的地区，并对以前覆盖的地区进行更详细的调查，以改进对矿物物理学和地幔动力学科学家有用的地震参数。

9814811RevenaughThis research involves the mapping of a feature just above the core-mantle boundary referred to as the ULVZ (Ultra-Low Velocity Zone). It is a thin layer (less than 40 km thick) characterized by greatly depressed compressional and shear velocities indicating that it is probably partially molten and possibly chemically differentiated from the overlying mantle. Inferred properties of the ULVZ make it an efficient conveyer of heat from the core, a shaper of the geodynamo, and a potential storehouse for deep mantle volatiles. Correlation of core-mantle boundary ULVZ patches with hotspot volcanism at the earth's surface suggests a link to plume genesis, specifically that instability within or on top of the layer may orchestrate heat flow from the deep mantle. To date, 44% of the core-mantle boundary has been probed for the presence or absence of a detectable ULVZ. 25% of the sampled core-mantle boundary is overlain by an ULVZ. This work involves extension of coverage to new areas and more detailed investigation of previously covered areas to refine seismic parameters that will be useful to the mineral physics and mantle dynamics scientists.