Deformation of a spherical, viscoelastic, and incompressible Earth for a point load with periodic time change
Deformation of a spherical, viscoelastic, and incompressible Earth for a point load with periodic time change
复制标题
具有周期性时间变化的点载荷下球形、粘弹性和不可压缩地球的变形
DOI：
10.1093/gji/ggaa268
复制
发表时间：
2020-09
影响因子：
2.8
通讯作者：
Sun Wenke
中科院分区：
文献类型：
--
作者：
Tang He;Dong Jie;Zhang Lan;Sun Wenke
Planetary-scale mass redistributions occur on Earth for certain spatiotemporal periods, and these surface mass changes excite the global periodic loading deformations of a viscoelastic Earth. However, the characteristics of periodic viscoelastic deformations have not been well investigated even in a simple earth model. In this study, we derive the semi-analytical Green's functions (fully analytical Love numbers) for long-standing point sources with given periods using a modified asymptotic scheme in a homogeneous Maxwell spherical earth model. Here, the asymptotic scheme is needed in order to obtain accurate semi-analytical time-dependent Green's functions. The amplitudes and phases of the Green's functions may be biased if only the series summations of the Love numbers are used because the influence of viscoelasticity is degree-dependent. We compare the viscoelastic and elastic periodic Green's functions with different material viscosities and loading periods and investigate the amplitude increase percentage and phase delay of the periodic displacement and geoid change. For example, our analysis revealed that the viscosity increases the amplitude by 40–120 per cent and delays the phase approximately −100° to 60° for the displacement and geoid change when bearing a 10-yr loading period, assuming a viscosity of 1018 Pa s and a shear modulus 4 × 1010 Pa.
登录
查看更多内容
影响因子：
--
作者：
T. Dam;J. Wahr;D. Lavallée
通讯作者：
T. Dam;J. Wahr;D. Lavallée
DOI：
10.1007/bf02448925
发表时间：
2010-01
期刊：
The Science of Nature
影响因子：
--
作者：
D. L. Anderson;R. O’Connell
通讯作者：
D. L. Anderson;R. O’Connell
影响因子：
--
作者：
S. Yi;Wenke Sun
通讯作者：
S. Yi;Wenke Sun
影响因子：
3.5
作者：
R. Ponte;A. Chaudhuri;S. Vinogradov
通讯作者：
R. Ponte;A. Chaudhuri;S. Vinogradov
影响因子：
--
作者：
R. Sabadini;D. Yuen;E. Boschi
通讯作者：
R. Sabadini;D. Yuen;E. Boschi