An Implementation Method of the Complex Frequency-Shifted Uniaxial/Multi-Axial PML Technique for Viscoelastic Seismic Wave Propagation

ABSTRACT

A numerical implementation method of the complex frequency-shifted uniaxial/multi-axial PML (CFS UPML/MPML) is developed for modeling half-space viscoelastic wave propagation. A mixed CFS PML combining CFS UPML and CFS MPML is designed to improve PML’s performances in avoiding evanescent waves at grazing incidence and stabilizing long-time simulation of low-frequency viscoelastic wave propagation. Two numerical examples’ results showed that the developed method for the mixed CFS PML can implement elimination of evanescent waves at grazing incidence near the PML interface, long-time accurate simulation of low-frequency viscoelastic wave propagation and efficient absorption of the near-fault outgoing seismic waves in homogeneous earth medium.

KEYWORDS:

• Perfectly matched layer
• viscoelastic earth medium
• grazing incidence
• seismic waves
• investigated lump

Disclosure Statement

No potential conflict of interest was reported by the authors.

Data Availability Statement

The data that support the findings of this study are openly available in Mendeley Data at http://doi.org/10.17632/7xr62bzzkr.1.

Additional information

Funding

This work was supported by Dr’s Scientific Research Start-up Project of Xichang University [Grant No. YBZ202232], Natural Science Foundation of Chongqing, China [Grant No. cstc2020jcyj-msxmX0744], Scientific and Technological Research Program of Chongqing Municipal Education Commission [Grant No. KJQN202003111] and Planning Subject for the3th Five-Year Plan for Chongqing Education Science [Grant No. 2019-GX-183].