Dispersion inversion for P- and S-wave velocities based on guided P and Scholte waves

Shi，Caiwang1,2,3; Ren，Hengxin1,2,3; Chen，Xiaofei1,2,3

2023-11-01

10.1190/geo2022-0783.1

Geophysics   影响因子和分区

0016-8033

1942-2156

Inversion based on dispersion curves is widely used for the estimation of subsurface velocity structures. However, conventional surface-wave dispersion inversion usually uses normal modes, and only the S-wave velocities are retrieved. To retrieve P-wave velocities, the dispersion of guided P waves should be considered. We develop an inversion scheme that uses the guided-P-wave and Scholte-wave modes to implement an integrated inversion for P- and S-wave velocity structures of shallow marine sediments. The forward modeling of dispersion curves is based on the spectral-element method and the perfectly matched layer technique. A quantitative sensitivity analysis of guided P modes is then carried out, which not only confirms the capability of guided P modes for estimating the P-wave velocity but also indicates that guided P modes can be combined with Scholte modes to better constrain the S-wave velocity. Based on the Levenberg-Marquardt algorithm, a joint inversion scheme that uses guided P and Scholte modes is developed. The validity of the inversion scheme is assessed by testing synthetic and field ocean-bottom seismometer data obtained in shallow marine environments. The results demonstrate the effectiveness of the joint inversion for retrieving the P- and S-wave velocity structures of shallow marine sediments.

dispersion inversion P wave surface wave

EI

英语

第一 ; 通讯

20234414989323

Acoustic wave velocity ; Dispersion (waves) ; Sediments ; Seismic waves ; Sensitivity analysis ; Shear waves ; Submarine geology ; Wave propagation

Oceanography, General:471.1 ; Geology:481.1 ; Soil Mechanics and Foundations:483 ; Seismology:484 ; Acoustic Waves:751.1 ; Mathematics:921 ; Mechanics:931.1

GEOSCIENCES

2-s2.0-85175033894

Scopus

1.Southern University of Science and Technology,Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Shenzhen,China
2.Southern University of Science and Technology,Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology,Shenzhen,China
3.Southern University of Science and Technology,Department of Earth and Space Sciences,Shenzhen,China

Shi，Caiwang,Ren，Hengxin,Chen，Xiaofei. Dispersion inversion for P- and S-wave velocities based on guided P and Scholte waves[J]. Geophysics,2023,88(6):R721-R736.

Shi，Caiwang,Ren，Hengxin,&Chen，Xiaofei.(2023).Dispersion inversion for P- and S-wave velocities based on guided P and Scholte waves.Geophysics,88(6),R721-R736.

Shi，Caiwang,et al."Dispersion inversion for P- and S-wave velocities based on guided P and Scholte waves".Geophysics 88.6(2023):R721-R736.