由PREM地球模型计算的洛夫数.pdfVIP

27 3 V ol . 27 , N o. 3 199 8 8 ACT A GE O DA ET ICA et CAR T O GR AP HICA SI NI CA A ug . , 1998 PREM * 　　萧耐园　夏一飞　　　　　　　成　灼　　　　　 ( , , 210093 ( , , 210008 LOVE NUMBERS CALCULATED WITH PREM X iao N aiyuan , X ia Y if ei ( Department of Astronomy, N anj ing University, N anj ing, 210093 Chen Zhuo ( Purple M ountain Observatory, The Chinese A cademy of Sciences, N anj ing, 210008 Abstract T he ear th being elast ic, ex ternal for ces ( luni-so lar tidal for ce , ro tational centr ifuga l for ce, surf ace lo ading etc. may lead it to elastic defor matio ns . M any coex isting phenomena, such as displacem ent s o f po ints on the ear th surf ace, var iations of the g r avit atio na l pot ential of the ear th ect . are cau sed w it h the defo rma tio ns . T he defor matio na l eff ects ar e related w ith t he per - turbational potentials of the ex ter nal fo r ces thro ug h L o ve numbers, w hich ar e dependent o n the inter na l str uctur e and o n t he elasticit y and t he density distr ibutio n of the matt er o f the ear th . T hen , acco rding to an eart h model that descr ibes the internal natur e of the ear th the L o ve num - ber s may be theo retically calculated . In this paper , a cho ice of the P relimina ry R ef er ence Ear th M odel ( P REM , the hithert o most ex cellent o ne , is made. T he pr incipal layer s and their paramet ers of the m odel ar e listed in the T ab . 1, and show n in f ig . 1. T he displace