An overset-grid finite-difference algorithm for simulating elastic wave propagation in media with complex free-surface topography

Zang, Nan1; Zhang, Wei2,3; Chen, Xiaofei2,3

2021-08-01

10.1190/GEO2020-0915.1

GEOPHYSICS   影响因子和分区

0016-8033

1942-2156

We have developed an overset-grid algorithm to simplify the difficulty of curvilinear grid (CG) generation and increase the computational efficiency for seismic wavefield modeling by using the finite-difference method in areas with complex surface topography. The overset grid comprises a Cartesian grid block and an approximately orthogonal CG block. The Cartesian grid covers most of the simulation domain, whereas the CG discretizes the near-surface topography. The Cartesian grid and the CG overlap each other arbitrarily. We use sixth-order explicit Lagrangian interpolation to exchange data between the Cartesian grid and the CG, which is shown to be sufficiently accurate. We also find that spatially smoothing the source term is important for reducing strong artificial reflections when the source is near the overlapping zone. Finally, numerical tests are performed to verify that the proposed overset grid is well suited for effective numerical simulation of seismic wave propagation.

SCI

英语

通讯

National Key R&D Program of China[2018YFC1504204] ; Shenzhen Key Laboratory of Deep Offshore Oil and GasExploration Technology[ZDSYS20190902093007855] ; Shenzhen Science and Technology Program[KQTD20170810111725321] ; China Earthquake Science Experiment Project of the China Earthquake Administration[2018CSES0101]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000738598800004

SOC EXPLORATION GEOPHYSICISTS

GEOSCIENCES

Web of Science

1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Deep Offshore Oil & Gas Explorat, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Guangdong, Peoples R China

Zang, Nan,Zhang, Wei,Chen, Xiaofei. An overset-grid finite-difference algorithm for simulating elastic wave propagation in media with complex free-surface topography[J]. GEOPHYSICS,2021,86(4).

Zang, Nan,Zhang, Wei,&Chen, Xiaofei.(2021).An overset-grid finite-difference algorithm for simulating elastic wave propagation in media with complex free-surface topography.GEOPHYSICS,86(4).

Zang, Nan,et al."An overset-grid finite-difference algorithm for simulating elastic wave propagation in media with complex free-surface topography".GEOPHYSICS 86.4(2021).