【摘要】 应用交错网格有限差分法对Kelvin-Viogt黏弹介质中的地震波传播进行了数值模拟,并在此基础上对介质的波阻抗和震源子波频率对地震波时频域衰减特征的影响进行了研究分析。研究表明,随着波阻抗的降低和震源子波频率的增大,地震纵波振幅衰减加快,地震波高频成分能量快速衰减,低频成分能量衰减相对较弱,主频向低频偏移加快。更多还原

【Abstract】 The seismic wave transmission was numerically simulated in Kelvin-Voigt viscoelastic mediawith the staggered grid limited difference method.On the basis,the influences of impedance,frequency of source wavelet on the attenuation characteristics of seismic wave time-frequency domain were studied and analyzed.The results showed that the amplitude of seismic wave was attenuated more rapidly with the decrease of impedance and increase of frequency of source wavelet,and the energy of high-frequency components of the seismic wave was attenuated more rapidly than that of the low-frequency components.As aresult,the principal frequency components were accelerated to offset to the low-frequency components during seismic wave propagation.更多还原