Results 251 to 260 of about 4,956 (290)

Null Detection in Shear-Wave Splitting Measurements

open access: yesBulletin of the Seismological Society of America, 2007
Shear-wave splitting measurements are widely used to analyze orien- tations of anisotropy. We compare two different shear-wave splitting techniques, which are generally assumed to give similar results. Using a synthetic test, which covers the whole backazimuthal range, we find characteristic differences, however, in fast-axis and delay-time estimates ...
Wüstefeld, A, Bokelmann, G
openaire   +3 more sources

Shear-wave splitting in compliant rocks

open access: yesThe Leading Edge, 2010
Shear-wave splitting is a phenomenon that has received a lot of attention primarily because of its connection with vertically aligned cracks or fractures within reservoirs. However, in most cases the largest amount of shear-wave splitting is observed to occur in the near-surface layers where the rocks are the least consolidated, and so are least likely
Peter Cary   +3 more
openaire   +2 more sources

Splitting parameter yield (SPY): A program for semiautomatic analysis of shear-wave splitting

open access: yesComputers & Geosciences, 2012
SPY is a Matlab algorithm that analyzes seismic waveforms in a semiautomatic way, providing estimates of the two observables of the anisotropy: the shear-wave splitting parameters. We chose to exploit those computational processes that require less intervention by the user, gaining objectivity and reliability as a result.
Lucia Zaccarelli   +2 more
openaire   +2 more sources

Shear-wave splitting measurements — Problems and solutions

Tectonophysics, 2008
Abstract We compare sensitivity and reliability of three basic techniques of shear-wave splitting analysis – cross-correlation of wave components, minimization of covariance matrix eigenvalues and minimizing energy on the transverse component – of both synthetic and real data, point out some problems and propose solutions.
Ludek Vecsey   +2 more
exaly   +2 more sources

Thin layers and shear-wave splitting

Geophysics, 1991
Abstract The near-surface weathering layer is considered by many to be strongly anisotropic. Any shear-wave signal passing through this low-velocity layer will inherit, to some degree, the anisotropic response of this layer. For thin weathering layers, information about previous anisotropic events may be distorted; when the thickness ...
R. D. Slack   +3 more
openaire   +1 more source

A New Understanding of Shear-Wave Splitting

Proceedings, 1995
Shear-wave splitting (shear-wave- bi-refringence) diagnostic of some form of azimuthal anisotropy is widely observed in all types of rock in the uppermost 15km of the Earth's crust (Crampin and Lovell 1991).
S. Crampin, S. V. Zatsepin
openaire   +1 more source

Home - About - Disclaimer - Privacy