Normal Mode Studies of Even and Odd Degree Elastic and Anelastic Structure of the Mantle and Core

RITZWOLLER这项研究是利用地球低频（小于12mhz）和长波（小于21）的正常模式来研究地球的地幔和地核。数据量比以前的研究增加了一个数量级，最近的大型深层事件呈现出以前从未被清楚观察到的正常分析模式。关于地幔，弹性约束对于估计过渡带和外下地幔的结构特别有用，因为目前的地幔模型差异最大，并且可以提供关于Vs/Vp变化的更好信息。对于地核，重点将放在对各向异性内核和深外核敏感的模式上。＊＊＊

9509836 RITZWOLLER This research is to use the normal modes of the earth at low frequency (less than 12 mHZ) and long-wavelength (l less than 21) to study the earth's mantle and core. Data quantity has been increased by an order of magnitude over previous studies, and recent large deep events present normal modes for analysis that have never before been clearly observed. Concerning the mantle, elastic constraints will be particularly useful for estimating structures in the transition zone and the outer lower mantle where current mantle models differ most appreciably and in providing better information about the variations of Vs/Vp. With respect to the core, focus will be on modes sensitive to the anisotropic inner core and the deep outer core. ***