| 地幔滞弹性对Chandler摆动的影响 |
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| 引用本文： | 朱耀仲.地幔滞弹性对Chandler摆动的影响[J].地球物理学进展,1993(2). |
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| 作者姓名： | 朱耀仲 |
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| 作者单位： | 中国科学院测量与地球物理研究所动力大地测量学开放研究实验室 武汉430077 |
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| 摘 要： | 基于简正模扰动理论和勒夫数扰动方法,采用Zschau 的地幔流变模型,在假设Chandler摆动的能量全部耗散于地幔滞弹性摩擦的条件下,导出Chandler 摆动Q(Q_w)的理论值.还考虑了滞弹地球的平衡极潮对摆动的影响,所得结果与绝大部分天文实测值非常一致.分析表明.平衡部分的影响大,地幔滞弹性很可能是Chandler 摆动最主要的能量耗散源,Q_w 的理论值约为71.还推算了吸收带模型参数α,研究了该模型的适用性,并讨论了Q_w 与地幔Q(Q_m)的关系.
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| 关 键 词： | 地幔滞弹性 平衡极潮 Chandler 摆动 能量耗散 Q值 |
EFFECTS OF MANTLE ANELASTICITY ON THE CHANDLER WOBBLE |
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| Zhu Yaozhong.EFFECTS OF MANTLE ANELASTICITY ON THE CHANDLER WOBBLE[J].Progress in Geophysics,1993(2). |
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| Authors: | Zhu Yaozhong |
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| Abstract: | On the basis of the perturbation principles of the mormal mode and Love numbers,the theoretical values of the Chandler wobble Q(Q_w)are derived by using Zschau's mantle rheology model under assump-tion the wobble energy is totally dissipated due to the friction of mantle anelasticity.The effect of the equi-librium pole tide of an anelastic Earth on the wobble is also taken into account.The results obtained are ingood agreement with most of the astronomical observations.The analyses show that the effect of theanelastic perturbation of the equilibrium pole tide is much larger than that of the non-equilibrium part ofthe pole tide,mantle anelasticity is likly to be the most important dissipative source of the Chandler wob-ble energy,and the theoretical Q_m is 71.Other theoretical parameters of the Chandler wobble are also giv-en.The parameter a of the absorption band model is calculated,and the applicability of the model is stud-ied.The relation between Q_w and the mantle Q(Q_m)is discussed as well. |
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| Keywords: | Mantle anelasticity Equilibrium pole tide Chandler wobble Energy dissipation QValues |
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