Traveltime inversion and error analysis for layered anisotropy

Jiang, Fan; Zhou, Hua‐wei

doi:10.1016/j.jappgeo.2010.12.001

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…The angle between the ray propagation direction and z axis is η, and we define η as positive when the angle is from z axis counterclockwise to the ray propagation direction, otherwise negative. So the group velocity in TTI media can be expressed as follows (Jiang and Zhou, 2011):…”

Section: Seismic Wave Velocity In Anisotropic Mediamentioning

confidence: 99%

“…For example, the initial value ray tracing is achieved by fitting the rolling surface with cubic spline interpolation function (Yue et al, 2007), the fast seismic ray tracing is achieved by building complex geological models with block structures (Xu at al., 2004;Wu and Jia., 2008), travel time calculations in complex rolling-layered medium is achieved by using irregular grids (trapezoid grids and triangular grids) to fit the rolling surface as well as partitioned multistep computation technique (Huang and Bai, 2010;Zhao and Bai, 2010), and so on. Most researches on seismic ray tracing in anisotropic media are still based on simple layered models (Qin and Schuster, 1993;Zhou and Greenhalgh, 2006;Jiang and Zhou, 2011), and only a few researches (Li at al., 2010) take the rolling surface into consideration.…”

Section: Introductionmentioning

confidence: 99%

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Tracing Seismic Shortest Path Rays in Anisotropic Medium with Rolling Surface

Hou-Yue

Zhang

2014

Chinese J of Geophysics

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It has very important theoretical and practical values to take rolling surface and seismic anisotropy into consideration in seismic forward modeling and inversion. Based on previous researches, the shortest path calculation algorithm is introduced in this paper to calculate seismic travel times in anisotropic media with rolling surface. In the process of model gridding, the whole model is divided into square cells firstly and rolling boundary is regarded as the approximation of units with irregular shapes. Then shortest path calculation is achieved on irregular grids by setting irregular nodes. Sena's group velocity approximation is used to calculate seismic travel times in anisotropic media during ray tracing, and seismic shortest path ray tracing in a complex anisotropic medium with rolling surface is achieved in the end. Theoretical model calculations show that the method in this paper can be reliably applied to complex anisotropic models with higher calculation accuracy.

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Section: Seismic Wave Velocity In Anisotropic Mediamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracing Seismic Shortest Path Rays in Anisotropic Medium with Rolling Surface

Hou-Yue

Zhang

2014

Chinese J of Geophysics

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“…Fomel's group velocity approximation is also accurate for strong VTI media (Yuan et al, 2006). An approximate group velocity is frequently used in tomography to derive sensitivity coefficients to the anisotropic parameters (Yuan et al, 2006;Jiang and Zhou, 2011), namely, Frechet derivatives.…”

Section: Velocity Equationmentioning

confidence: 99%

3D VTI traveltime tomography for near-surface imaging

Zhang

2013

SEG Technical Program Expanded Abstracts 2013

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Seismic first arrivals that propagate in the near surface area are affected by velocity anisotropy. With VTI assumption for the media, we develop a grid-based qP wave traveltime tomography method to invert Thomsen parameters, including  and at each grid point in the shallow area. In numerical experiments, we fix the symmetry axis velocity V p0 , inverting only  and . For single-parameter inversion, we invert  and  respectively, and for twoparameter inversion, we invert  and  simultaneously. Results indicate that  is better resolved than  from inverting the first arrivals.

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A Layer-cell Tomography Method for Near-surface Velocity Model Building Using First Arrivals

Zhou

et al. 2020

Pure Appl. Geophys.

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Traveltime inversion and error analysis for layered anisotropy

Cited by 7 publications

References 36 publications

Tracing Seismic Shortest Path Rays in Anisotropic Medium with Rolling Surface

Tracing Seismic Shortest Path Rays in Anisotropic Medium with Rolling Surface

3D VTI traveltime tomography for near-surface imaging

A Layer-cell Tomography Method for Near-surface Velocity Model Building Using First Arrivals

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