Seismic Anisotropy in the Earth

The inner inner core of the Earth: Texturing of iron crystals from three-dimensional seismic anisotropy

We present a three-dimensional model of the seismic anisotropy and texturing of iron crystals in the inner core. The form of the anisotropy changes suddenly at slightly less than half of the inner core radius. The outer part is composed of iron crystals of a single phase with different degrees of preferred alignment along the spin axis of the Earth. The inner part may be composed of a different...

Practical applications of seismic anisotropy

s, 1139–1142. Grechka, V., Mateeva, A., Gentry, C., Jorgensen, P, Lopez, P. and Franco, G. [2007] Estimation of seismic anisotropy from P-wave VSP data. The Leading Edge, 26(6), 756–759. Hudson, J.A. [1981] Wave speeds and attenuation of seismic waves in materialc containing cracks. Geophysical Journal of the Royal Astronomical Society, 64, 133–150. CC02339-MA009 Seabird Exploration.indd 10...

Mantle dynamics and seismic anisotropy

a r t i c l e i n f o Keywords: seismic anisotropy mantle flow geodynamic modeling shear wave splitting surface wave analysis mantle convection Observations of seismic anisotropy yield some of the most direct constraints available on both past and present-day deformation in the Earth's mantle. Insight into the character of mantle flow can also be gained from the geodynamical modeling of mantle ...

Seismic Gradiometry using Ambient Seismic Noise in an Anisotropic Earth

Imaging the solid Earth with seismic noise

The correlation of ambient vibrations of the Earth yields the impulse response between two passive sensors as if one was a source. This provides the opportunity to image the Earth beneath regional seismic arrays. In this paper, we present imaging of the lithosphere in Europe based on surface Rayleigh waves extracted from continuous record of the seismic noise. We also recall a brief history of ...