Seismic Velocity and Attenuation Structures of the Earth's Inner and Outer Core

PI提议研究地球内外核的地震速度和衰减结构及其对矿物物理和动力学的影响。地震结构将根据从全球和区域地震台网收集的各种PKP分支的差分传播时间和波形进行研究。地震研究将分别在“东”半球和“西”半球进行，分两个步骤进行：1)建立PKP相位采样赤道路径的地球内外核二维地震速度和衰减模型；2)限制各向异性的大小和从可能的上层各向同性层到内核深处各向异性的转变。

WENEAR-0207746The PI proposes a study of seismic velocity and attenuation structures for both the Earth's inner and outer core and their implications for mineral physics and dynamics. The seismic structures will be studied based on the differential travel times and waveforms of various PKP branches collected from the global and regional seismic networks. Seismic studies will be performed for the "eastern" and "western" hemispheres respectively, and in two steps: 1) establish two one-dimensional seismic velocity and attenuation models of the Earth's inner and outer core for the PKP phases sampling equatorial paths; and, 2) constrain anisotropy magnitudes and transitions from a possible top isotropic layer to deep anisotropy in the inner core.