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group velocity
Crust–Uppermost Mantle Structure beneath the Caribbean Region from Seismic Ambient Noise Tomography
High‐Resolution Shear‐Wave Velocity Structure of the 2019 M s 6.0 Changning Earthquake Region and Its Implication for Induced Seismicity
Joint Inversion of Receiver Function and Surface Wave Dispersion by Hamiltonian Monte Carlo Sampling
Evaluation of the 3D Near‐Surface Velocity Structure in an Urban Environment from Ambient Noise Array Tomography: The Case of the City of Thessaloniki (Northern Greece)
Seismic and Infrasound Data Recorded at Regional Seismoacoustic Research Arrays in South Korea from the Six DPRK Underground Nuclear Explosions
Automatically Extracting Surface‐Wave Group and Phase Velocity Dispersion Curves from Dispersion Spectrograms Using a Convolutional Neural Network
Rational approximation of P-wave kinematics — Part 1: Transversely isotropic media
Optimal finite-difference operators for arbitrarily sampled data
Abstract Group velocities for a period range of 6–60 s for the fundamental mode of the Rayleigh wave passing across the Himalaya–Karakoram–Tibet orogen are used to delineate the structure of the upper lithosphere using the data from 35 broadband seismic stations. 2D tomography velocity maps of group velocities were obtained at grids of 1° separation. Redefined local dispersion curves are inverted non-linearly to obtain 1D velocity models and to construct a 3D image of the S-wave structure down to a depth of 90 km. The Moho discontinuity is correlated with c. 4.0 km s −1 S-wave velocity. The results depict a NE-dipping trend of the Moho depth from c. 40 km beneath the frontal part of the Himalaya to up to c. 70–80 km beneath the collision zone before shallowing substantially to c. 40 km beneath the Tarim Basin. The study also reveals thick deposits of sediments in the Indo-Gangetic plains and the Tarim Basin. A broad low-velocity zone at mid-crustal depth in the western Tibetan Plateau, the Karakoram region and the surface-collision part of the India–Eurasia tectonic plates is interpreted as the effect of partial melting and/or the presence of aqueous fluid. The high velocities in the southern deeper part indicate that the lower crust and uppermost mantle of the Indian Plate are dense and cold.
Generalized velocity approximation
Slant f - k transform of multichannel seismic surface wave data
Sparsity-promoting method to estimate the dispersion curve of surface-wave group velocity
Surface‐Wave Retrieval from Generalized Diffuse Fields in 2D Synthetic Models of Alluvial Valleys
Estimation of surface-wave group velocity using slant stack in the generalized S-transform domain
3D mantle structure of Central Asia from Rayleigh wave group velocity dispersion
Estimation of elastic stiffness coefficients of an orthorhombic physical model using group velocity analysis on transmission data
Love waves from local traffic noise interferometry
Rayleigh-wave tomography at Coronation Field, Canada: The topography effect
Elements of Seismic Dispersion: A Somewhat Practical Guide to Frequency-dependent Phenomena
Abstract Elements of Seismic Dispersion: A Somewhat Practical Guide to Frequency-dependent Phenomena (SEG Distinguished Instructor Series No. 15) covers selected effects encountered in the acquisition, processing, and interpretation of reflectionseismic data. The material, based on the 2012 SEG Distinguished Instructor Short Course, shows how those phenomena arise, how they can be characterized, and the important information they contain. The text shows how spectral decomposition and time-frequency methods have led to improved understanding and use of nonlinear harmonics, near-surface guided waves, layer-induced anisotropy, velocity dispersion and attenuation, interference, and Biot reflection. Accessible discussion is augmented by examples, figures, and references to primary literature for further study. This book will interest technical managers and those who work in acquisition, processing, and interpretation of seismic data. (DISC on DVD, 761A, is also available.)
Seismic Signatures and Analysis of Reflection Data in Anisotropic Media, Third Edition
Abstract This is a new edition of Ilya Tsvankin’s reference volume on seismic anisotropy and application of anisotropic models in reflection seismology. Seismic Signatures and Analysis of Reflection Data in Anisotropic Media, Geophysical References Series No. 19, provides essential background information about anisotropic wave propagation, introduces efficient notation for transversely isotropic (TI) and orthorhombic media, and identifies the key anisotropy parameters for imaging and amplitude analysis. To gain insight into the influence of anisotropy on a wide range of seismic signatures, exact solutions are simplified in the weak-anisotropy approximation.