Chandler摆动的频散现象一般可归结为(i)海洋中能量耗散,(ii)地幔与地核之间的耦合效应,(iii)地幔物质非弹性。就其主要原因来说多数人认为当属后者(Mank与Macdonald 1960,chap.10;Lambeck,1980,chap.8)。如果忽略海洋摩擦及核幔耦合效应,一个自然的想法就是能否将为解释地震波及自由振荡中观测到的衰减现象而建立起的耗散机制外推到Chandler摆动。这种外推若是合理的,对地球流变性质的研究就能从0.2s至100min振动周期时间尺度扩散到14个月周期的时间尺度。Jefferys首先认识到Chandler摆动这一特殊重要意义。在他的一个开创性工作中(1958),利用修改了的Lomnitg定律,Jefferys导出在非弹性效应很小的前提下衰减因子Q与频率f之间满足一个简单关系 The dispersion of Chandler oscillations can generally be attributed to (i) the energy dissipation in the ocean, (ii) the coupling effect between the mantle and the core, and (iii) the inelastic mantle material. Most people, for the most part, think of the latter (Mank and Macdonald 1960, chap.10; Lambeck, 1980, chap. 8). If we ignore the effects of ocean friction and mantle-mantle coupling, it is a natural idea whether we can extrapolate the dissipative mechanism that was created to explain the attenuation observed in seismic waves and free oscillations to Chandler oscillations. If this extrapolation is justified, the study of the rheological properties of the earth can spread from the time scale of the oscillation cycle of 0.2 s to 100 min to the time scale of the 14-month cycle. Jefferys first recognized Chandler swing this special significance. In one of his seminal work (1958), using a modified Lomnitg’s law, Jefferys derived a simple relationship between the attenuation factor Q and the frequency f under the condition of a small inelastic effect