CAJ | 학술논문

提出了慢度和偏振的摄动完全是由平面波非均匀性参数D引起的观点,改进了Cerveny和Psencik提出的计算各向异性弱粘弹性介质中非均匀平面波慢度和偏振的摄动公式,给出了在形式上更为简单的摄动公式.与原有的公式相比,新的摄动公式对均匀平面波是精确的,并且在形式上更加简洁.对一个二维横向各向同性弱粘弹性介质模型,根据新的摄动公式与原有的摄动公式及精确公式,用数值方法分别模拟了平面波(qP,qSV,qSH)沿传播向量方向的慢度虚部Im(σ)和质点振动.比较发现,用新的摄动公式得到的qP和qSV波的慢度虚部Im(σ)和质点振动比原有的摄动公式更精确, 而对qSH波两种方法近似效果相差无几.经过综合比较,可以断定新的公式要优于原有的公式.
제출료만도화편진적섭동완전시유평면파비균균성삼수D인기적관점,개진료Cerveny화Psencik제출적계산각향이성약점탄성개질중비균균평면파만도화편진적섭동공식,급출료재형식상경위간단적섭동공식.여원유적공식상비,신적섭동공식대균균평면파시정학적,병차재형식상경가간길.대일개이유횡향각향동성약점탄성개질모형,근거신적섭동공식여원유적섭동공식급정학공식,용수치방법분별모의료평면파(qP,qSV,qSH)연전파향량방향적만도허부Im(σ)화질점진동.비교발현,용신적섭동공식득도적qP화qSV파적만도허부Im(σ)화질점진동비원유적섭동공식경정학, 이대qSH파량충방법근사효과상차무궤.경과종합비교,가이단정신적공식요우우원유적공식.
After proposing a viewpoint that the perturbation of slowness and polarization is fully due to the inhomogeneous parameter D of inhomogeneous plane wave, the authors have improved the original perturbation formulas used by Cerveny and Psencik for the slowness and polarization of the inhomogeneous plane wave propagating in anisotropic weakly viscoelastic media, with new perturbation formulae for slowness and polarization, which are more concise than the previous and are exact for homogeneous wave. Numerical modeling for imaginary part of slowness Im(σ) and particle motion shows that the new perturbation formulae are better than the original ones for qP and qSV wave and have almost the same accuracy as the original for qSH wave.