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

9814811这项研究涉及到核-地幔边界上方被称为ULVZ(超低速带)的地物的测绘。它是一个薄层(厚度不到40公里)，其特征是压缩和剪切速度大大降低，表明它可能是部分熔融的，可能与上覆地幔在化学上分异。ULVZ的推断特性使其成为地核热量的有效传送者，地球发电机的塑造者，以及深地幔挥发物的潜在储藏库。核-地幔边界ULVZ斑块与地球表面热点火山活动的关联表明了与羽流成因的联系，具体地说，层内或层顶的不稳定可能协调了来自地幔深处的热流。到目前为止，已经探测了44%的核-地幔边界，以确定是否存在可探测到的ULVZ。25%的采样核-地幔边界被ULVZ覆盖。这项工作涉及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，以完善将对矿物物理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.