What causes seismic anisotropy?
Origin of anisotropy The origin of seismic anisotropy is non-unique, a range of phenomena may cause Earth materials to display seismic anisotropy. The anisotropy may be strongly dependent on wavelength if it is due to the average properties of aligned or partially aligned heterogeneity.
What is radial anisotropy?
Radial seismic anisotropy describes seismic anisotropy with a vertical symmetry axis, which causes a difference in the wave speed of the vertically or horizontally polarized shear waves irrespective of their azimuth of propagation.
What is intrinsic anisotropy?
The contribution of the intrinsic anisotropy is a shift of the velocity to higher values (if the horizontal velocity exceeds the vertical velocity in the background) by an amount that is determined by the magnitude of the intrinsic anisotropy.
What are Thomsen parameters?
Thomsen (1986) introduced three anisotropic parameters, ε, δ and γ, to describe weak anisotropy, which is believed to be the common case of anisotropy. These parameters can be computed with stiffness tensor of the anisotropic media. The determination of the stiffness tensor fully defines an elastic medium.
What is anisotropy parameter?
The anisotropy parameter provides phase information about the dynamics of the photon process [1].
What is an anisotropic property of a crystal?
Anisotropic is one of the properties exhibited by crystalline solids. The anisotropic property of a crystal depends on the symmetry of the unit cell in the crystal. The arrangement of these atoms in the crystal differs in all three planes.
What anisotropy means?
anisotropy, in physics, the quality of exhibiting properties with different values when measured along axes in different directions. A familiar example of anisotropy is double refraction or birefringence, the difference in the speed of light along different axes of crystals of the mineral calcite.
What is an anisotropy in chemistry?
Anisotropy is the property of substances to exhibit variations in physical properties along different molecular axes. This leads to different physical and mechanical properties in a single crystal along the different axes: examples are different electrical and thermal conductivity and light polarization.
What are Anistropic substances?
Anisotropy: In crystalline substances, properties such as electrical conductivity, refractive index and thermal expansion have different values in different directions. This behavior of crystalline solids is called anisotropy and these substances are called anisotropic.
What is anisotropy in biology?
Growth anisotropy describes the condition when growth rates are not equal in all directions. In contrast, when growth rates are the same rate in all directions, growth is isotropic. Anisotropy is a hallmark of plant growth. Almost without exception, cells grow faster in one direction than in another.
Is nacl anisotropic?
Table salt, or sodium chloride, is also isotropic and is illustrated below in Figure 1(a). Crystals may be classified as either isotropic or anisotropic depending upon their optical behavior and whether or not their crystallographic axes are equivalent.