Importance of double-pole CFS-PML for broad-band seismic wave simulation and optimal parameters selection

Feng, Haike1,2; Zhang, Wei3; Zhang, Jie1,2; Chen, Xiaofei3

2017-05

10.1093/gji/ggx070

GEOPHYSICAL JOURNAL INTERNATIONAL   影响因子和分区

0956-540X

1365-246X

The perfectly matched layer (PML) is an efficient absorbing technique for numerical wave simulation. The complex frequency-shifted PML (CFS-PML) introduces two additional parameters in the stretching function to make the absorption frequency dependent. This can help to suppress converted evanescent waves from near grazing incident waves, but does not efficiently absorb low-frequency waves below the cut-off frequency. To absorb both the evanescent wave and the low-frequency wave, the double-pole CFS-PML having two poles in the coordinate stretching function was developed in computational electromagnetism. Several studies have investigated the performance of the double-pole CFS-PML for seismic wave simulations in the case of a narrowband seismic wavelet and did not find significant difference comparing to the CFS-PML. Another difficulty to apply the double-pole CFS-PML for real problems is that a practical strategy to set optimal parameter values has not been established. In this work, we study the performance of the double-pole CFS-PML for broad-band seismic wave simulation. We find that when the maximum to minimum frequency ratio is larger than 16, the CFS-PML will either fail to suppress the converted evanescent waves for grazing incident waves, or produce visible low-frequency reflection, depending on the value of a. In contrast, the double-pole CFS-PML can simultaneously suppress the converted evanescent waves and avoid low-frequency reflections with proper parameter values. We analyse the different roles of the double-pole CFS-PML parameters and propose optimal selections of these parameters. Numerical tests show that the double-pole CFS-PML with the optimal parameters can generate satisfactory results for broad-band seismic wave simulations.

Numerical solutions Earthquake ground motions Computational seismology Wave propagation

SCI ; EI

英语

通讯

Fundamental Research Funds for the Central Universities[WK2080000053]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000402641600046

OXFORD UNIV PRESS

20194807754417

Electromagnetic wave reflection ; Seismic waves ; Seismology ; Wave propagation

Structural Members and Shapes:408.2 ; Seismology:484 ; Earthquake Measurements and Analysis:484.1 ; Electromagnetic Waves:711

GEOSCIENCES

Web of Science

1.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Anhui, Peoples R China
2.Mengcheng Natl Geophys Observ, Hefei 230026, Anhui, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China

Feng, Haike,Zhang, Wei,Zhang, Jie,et al. Importance of double-pole CFS-PML for broad-band seismic wave simulation and optimal parameters selection[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2017,209(2):1148-1167.

Feng, Haike,Zhang, Wei,Zhang, Jie,&Chen, Xiaofei.(2017).Importance of double-pole CFS-PML for broad-band seismic wave simulation and optimal parameters selection.GEOPHYSICAL JOURNAL INTERNATIONAL,209(2),1148-1167.

Feng, Haike,et al."Importance of double-pole CFS-PML for broad-band seismic wave simulation and optimal parameters selection".GEOPHYSICAL JOURNAL INTERNATIONAL 209.2(2017):1148-1167.