Waveform Modeling Applied to Three Deep Structure Problems: Slabs, D", and the Inner Core

这项研究将研究地球上三个相隔很远的地区，使用早期研究开发的理论波形建模的共同线索。地震体波将用近似高频和混合近似/有限差分技术合成，并与数据波形进行比较，以研究三个区域的特征：1)岩石圈下沉板块的厚度、地幔穿透和层化：2)地幔最低D“区的异谱和核幔边界的地形；3)内核弹性和滞弹性结构的横向变化和各向异性。这项研究的结果将包括以下证据：650千米以下板条穿透的存在或性质的证据；沿一些板条顶部的高频波导源的测试；波恩近似对PKIKP前兆研究的适用性和D内强散射的重要性“；以及内核滞弹模型的测试，以解释观测到的PKIKP的幅度、走时和频率含量。

This research will study three widely separated areas of the earth with a common thread of theoretical waveform modeling that has been developed by earlier studies. Seismic body waves will be synthesized using approximate high frequency and hybrid approximate/finite difference techniques and compared to data waveforms to investigate characteristics from three zones: 1) the thickness, mantle penetration, and stratification of descending lithospheric slabs; 2) the heterospectrum of the lowermost D" region of the mantle and topography of the core-mantle boundary; and 3) the lateral variation and anisotropy of the elastic and anelastic structure of the inner core. The results of this research will include evidence for the existence or nature of slab penetration below 650 km; a test of the origin of a high frequency waveguide along the top of some slabs; a test of the applicability of the Born approximation to the study of PKIKP precursors and the importance of strong scattering within D"; and a test of an anelastic model of the inner core as an explanation for the observed amplitude, travel time, and frequency content for PKIKP.