CAJ | 학술논문

采用交错网格技术将速度-应力方程中的速度对时间的导数转化为应力对空间的导数,将弹性波动方程表示为与二阶双曲方程等价的一阶应力-速度公式,以实现三维三分量地震波场模拟.对获得的波场快照、VSP记录图像和地面记录图像进行波场分析,发现在波场图像中存在明显的拟P波、拟快横波和慢横波,还出现了横波分裂、横波分裂盲区及波面三分叉等地震波在方位各向异性介质传播时产生的特殊现象.研究结果表明,用交错网格三维模拟方法研究方位各向异性介质对方位各向异性介质中地震波传播反演能起到很强的辅助作用.
채용교착망격기술장속도-응력방정중적속도대시간적도수전화위응력대공간적도수,장탄성파동방정표시위여이계쌍곡방정등개적일계응력-속도공식,이실현삼유삼분량지진파장모의.대획득적파장쾌조、VSP기록도상화지면기록도상진행파장분석,발현재파장도상중존재명현적의P파、의쾌횡파화만횡파,환출현료횡파분렬、횡파분렬맹구급파면삼분차등지진파재방위각향이성개질전파시산생적특수현상.연구결과표명,용교착망격삼유모의방법연구방위각향이성개질대방위각향이성개질중지진파전파반연능기도흔강적보조작용.
Used the staggered grid techniques to translate the velocity derivative with respect to time into stress derivative of spatial in velocity-stress equation, and expressed the elastic wave equation in first-order velocity-stress equation equial to second-order hyperbolic equation, the simulation for the three dimensional tricomponent of seismic wave field is achieved. The analysis of wave field snapshoot, VSP image recording and ground image recording indicates that the obvious quasi-P, quasi-SV and quasi-SH, and even some particular phenomena produced in azimuthal anisotropic medium propagating of earthquake wave such as shear-wave splitting, shear-wave splitting dead zone and wave-front three bifurcation exist in wave field image. The results show that three dimensional simulation of staggered grid technique is an important complement for study of the inversion of azimuthal of anisotropic medium to earthquake wave propagation in azimuthal anisotropic medium.