Introduction: Image contrast in magnetic resonance elastography (MRE) is based on mechanical properties of tissues [1]. Recently, there has been an increasing interest in the area of MRE of the brain. So far, MRE has shown to be the only suitable noninvasive method for determining elastic [2-4] and even viscoelastic [5-7] properties of the human brain parenchyma in vivo. However, data reported ...

Long-period (100-330 s) fundamental-mode Love and Rayleigh waves have been processed to measure the great circle phase velocities for about 200 and 250 paths, respectively. The observations are inverted for regionalized phase velocities and for an even-order harmonic expansion of the lateral velocity heterogeneity. The regionalized inversions achieve a maximum variance reduction of about 65% an...

We study transport for a scalar model of Love waves. These waves arise in the propagation of seismic waves whose energy is concentrated in the vicinity of the earth surface. We derive radiative transfer equations from rst principles for the angularly resolved energy density of the Love waves in a simpliied acoustic model. We consider a rough top surface with weak uctuations at the scale of the ...

Unimodular gravity is a modified theory with respect to general relativity by an extra condition that the determinant of metric fixed. Especially, if energy-momentum tensor not imposed be conserved separately, new geometric structure will appear potential observational signatures. In this paper, we study tidal deformability compact star in unimodular under assumption non-conserved tensor. Both ...

The waves and vibrations are encountered everywhere, in the living and non living nature, in engineering. The atoms, molecules, oceans, planets, galaxies, cosmic space, cells of living organisms, separate organs and the organism as a whole do perform wave motion. It is important for the mankind to use effectively the waves arising in nature as a power source or as the working organs for the exe...

ABSTRACT The application of ambient seismic noise cross-correlation to distributed acoustic sensing (DAS) data recorded by subsurface fiber-optic cables has revolutionized our ability obtain high-resolution images the shallow subsurface. However, passive surface-wave imaging using DAS arrays is often restricted Rayleigh-wave and 2D along straight segments due intrinsic sensitivity being limited...