Modified Generalized R/T Coefficient Method for Surface-Wave Dispersion-Curve Calculation in Elastic and Viscoelastic Media

Pan，Lei1,2; Yuan，Shichuan1,2; Chen，Xiaofei1,2

2022-10-01

10.1785/0120210294

BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA   Impact Factor & Quartile

0037-1106

1943-3573

This article presents an efficient and effective modified generalized reflection and transmission (R/T) (mGRT) coefficient method for dispersion-curve calculation of the Rayleigh and Love waves. We construct a novel dispersion function based on the kernel function for calculating synthetic seismograms in an elastic layered half-space model. It improves the root searching using the monotonicity of the dispersion function in sections between roots. We introduce an auxiliary function to accelerate the root-searching procedure by approximating the number of roots of the dispersion equation. To solve the low-velocity-layer problem for the generalized R/T coefficient method, we turn to the dispersion function of multiple depths. Numerical results indicate that the proposed method is slightly slower than the other most efficient methods including the delta-matrix method and the fast delta-matrix method. Then, we present a technique for the velocity and attenuation dispersion curves in viscoelastic media. The technique is based on jumping features of the dispersion function and converts 2D root-searching problem to 1D minimization problem. The mGRT method is expected to be a useful candidate for calculating dispersion curves in both elastic and viscoelastic media.

SCI

English

First ; Corresponding

National Natural Science Foundation of China[42004032];National Natural Science Foundation of China[U1901602];

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000876739000003

SEISMOLOGICAL SOC AMER

GEOSCIENCES

2-s2.0-85139124914

Scopus

1.Department of the Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,China

Pan，Lei,Yuan，Shichuan,Chen，Xiaofei. Modified Generalized R/T Coefficient Method for Surface-Wave Dispersion-Curve Calculation in Elastic and Viscoelastic Media[J]. BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,2022,112(5):2280-2296.

Pan，Lei,Yuan，Shichuan,&Chen，Xiaofei.(2022).Modified Generalized R/T Coefficient Method for Surface-Wave Dispersion-Curve Calculation in Elastic and Viscoelastic Media.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,112(5),2280-2296.

Pan，Lei,et al."Modified Generalized R/T Coefficient Method for Surface-Wave Dispersion-Curve Calculation in Elastic and Viscoelastic Media".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 112.5(2022):2280-2296.