PREM-ZSCHAU滞弹地球模型对表面负荷的脉冲响应

利用PREM模型及ZSCHAU的地球内部粘滞性模型,解算了地球对表面负荷的脉冲响应问题,包括频率域和时间域的解.得到的复勒夫数及复格林函数表明,在ω>10~(-8)/s的频段内,地球的响应可视为基本上是弹性的,只有像冰后调整、地幔对流这样长期的运动,粘滞性才起重要作用;在ω<10~(-13)/s的频段,地球响应呈流体状态.

IMPULSE RESPONSE OF SURFACE LOADING BASED ON PREM-ZSCHAU EARTH MODEL

Impulse response of surface loading on the earth, including the solution in time and frequency domain, is investigated based on PREM model and Zschau's viscosity model inside of the earth. The complex Love number and complex Green function obtained show that, in the case ofω>10-8/s, the response of the earth can be considered essentially as a pure elastic one; only in the case of the long period motions, such as glacial rebound and mantle convection, the viscosity becomes more important. Whenω<10-13/s, the earth seems to be in a liquid position.