... for achieving accurate inversion of multiple parameters. The elastic wave equation and viscoelastic wave equation consider the S-wave velocity in the fluid to be zero, which leads to incorrect fluid-solid boundary conditions and consequently causes numerical dispersion and energy distortion in the simulated...

... on the g*H method are derived and solved by the fourth-order Runge–Kutta method for four inhomogeneous viscoelastic, vertical transversely isotropic (VTI) velocity models. The ray tracing equations are solved for specified real-incident slowness vectors and specified ray directions, highlighting...

... a multiparameter viscoelastic FWI workflow that attempts to mitigate crosstalk by separating the problem into smaller pieces, focusing on different properties with specific portions of the data as well as better-suited cost functions. The workflow first improves the P-wave background velocity and attenuation...

...Bashar Hariri, M.EERI; Michael Montgomery; Chiyun Zhong; Constantin Christopoulos This article proposes a stability-enhanced alternative to traditional buckling-restrained steel braced frames (BRBFs) for application in tall-rise steel buildings located in high seismic regions. The viscoelastic (VE...

...Xinru Mu; Tariq Alkhalifah; Jianping Huang ABSTRACT The constant- Q viscoelastic wave equation, which includes decoupled amplitude attenuation and phase dispersion terms, is commonly used for attenuation-compensated reverse time migration (RTM). However, this equation involves fractional Laplacian...

... on viscoelastic theory, is a useful tool for fluid identification. In conventional prestack inversion, linear approximations are usually used to calculate the reflection coefficients, whereas nonlinear inversions are only occasionally carried out. However, the nonlinear equation for the reflection coefficient...

... demanding, requiring a significant amount of computer memory and runtime. To address this issue, a more efficient and accurate approach known as 2.5D modeling can be used when the subsurface geologic structure is two dimensions. We develop a new numerical method for 2.5D time-domain viscoelastic wave...

...Bing Zhou; Muhammad Fadhil Darwis; Xingwang Li; Stewart Greenhalgh; Xu Liu ABSTRACT Computation of the ray-velocity vector is crucial in seismic ray tracing for the three body waves (qP, qSV, qSH) in viscoelastic anisotropic media. The primary challenge is dealing with the likely cusps...

... physics-based method to interpret these different arrivals simultaneously, except for viscoelastic FWI ( Fabien-Ouellet et al., 2017 ). FWI is a seismic inversion method based on the minimization of the difference between the recorded traces and the full-waveform modeled traces ( Tarantola, 1984...

...Qi Hao; Ilya Tsvankin ABSTRACT Separating wave modes on seismic records is an essential step in imaging of multicomponent seismic data. Viscoelastic anisotropic models provide a realistic description of subsurface formations that exhibit anisotropy of velocity and attenuation. However, mode...

... carried out to investigate the time-dependent behaviour: that is, the creep behaviour of sandstone. Then the creep equation of the viscoelastic–plastic model was derived, and the damage coefficients under the effect of dry–wet cycles and time were obtained. Finally, the HKP model was established...

...Guoqi Ma; Bing Zhou; Mohamed Kamel Riahi; Jamal Zemerly; Liu Xu ABSTRACT Solving large sparse linear systems in 3D frequency-domain seismic wave modeling, especially in viscoelastic anisotropic media, poses significant challenges due to the increasing number of discrete moduli and nonzero elements...

...Caiwang Shi; Shichuan Yuan; Xiaofei Chen ABSTRACT Efficient and accurate calculation for the dispersion and attenuation of the surface waves in viscoelastic media is numerically challenging because the eigen wavenumbers are located in the complex domain. In this study, we propose a semianalytical...

...Roger D. Borcherdt ABSTRACT The recent developments in general viscoelastic ray theory provide a rigorous mathematical framework for anelastic seismic tomography. They provide closed‐form solutions of forward ray‐tracing and simple inverse problems for anelastic horizontal and spherical layered...

...Guanghui Han; Bingshou He; Huixing Zhang; Enjiang Wang ABSTRACT Viscoelastic wave equations based on the constant- Q (CQ) model can accurately describe the amplitude dissipation and phase distortion of waves in anelastic media. However, only three velocity or displacement components can be obtained...

...Di Wang; Bing Zhou; Stewart Greenhalgh; Chao-Ying Bai; Xing-Wang Li ABSTRACT Under the high-frequency assumption, the slowness vector in a viscoelastic anisotropic medium is often defined by a complex-valued vector, whose direction is given by a complex unit vector that can hardly ever be explained...

.... These data are usually applied to effectively remove ghost waves and ringing interference in the seawater layer, rather than being jointly used for migration. We propose an ocean bottom dual-sensor viscoacoustic and separated-viscoelastic coupled Q -compensated least-squares reverse time migration (OBD-VSV...

... slip and transient postseismic processes such as poroelastic effects and viscoelastic relaxation. However, the combined influence of poroelastic effects and viscoelastic relaxation on co- and postseismic Coulomb stress changes has not been systematically studied so far. Here, we use three-dimensional...

... and coupling on the megathrust. We construct Green’s functions for interseismic slip deficit for discrete faults embedded in an elastic plate overlying a viscoelastic mantle. We then use a constrained least‐squares inversion to determine best‐fitting slip rates on the major faults and investigate slip rate...

... limit, we develop a viscoelastic parameter-modified (VPM) method for the implementation of the free-surface boundary condition in the 3D viscoelastic wave equation. Our approach modifies the viscoelastic constitutive relation and density at the free surface and provides a formulation in terms...