Results 251 to 260 of about 2,042,519 (287)

Teleseismic shear wave splitting measurements in noisyenvironments [PDF]

Geophysical Journal International, 1999
SUMMARY High noise levels hamper teleseismic shear wave splitting measurements, which bandpass filtering does not always help. To investigate how robust splitting measurements are to noise, we analysed a set of synthetic records with known splitting parameters and added fixed levels of noise.
George R. Helffrich, Andrea Restivo
exaly   +4 more sources

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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, D. A. Ebrom, J. A. McDonald, R. H. Tatham   +3 more
openaire   +1 more source

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.
Luděk Vecsey, Jaroslava Plomerová, Vladislav Babuska   +2 more
exaly   +2 more sources

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

Full-wave effects on shear wave splitting [PDF]

Geophysical Research Letters, 2014
AbstractSeismic anisotropy in the mantle plays an important role in our understanding of the Earth's internal dynamics, and shear wave splitting has always been a key observable in the investigation of seismic anisotropy. To date the interpretation of shear wave splitting in terms of anisotropy has been largely based on ray‐theoretical modeling of a ...
Shu-Huei Hung, Yu-Pin Lin
exaly   +2 more sources

Shear Wave Splitting in Himalaya

Chinese Journal of Geophysics, 2007
AbstractWe analyze the records of 56 stations in Himalaya area with the method of minimizing the eigenvalue. Splitting was observed at thirty‐nine stations of them. The average splitting time is about 0.8s. The parameters of splitting vary not only from south to north, but are also different on the two sides of the line joining the station GAIG and ...
openaire   +1 more source

Bootstrapping shear-wave splitting errors

Bulletin of the Seismological Society of America, 1994
Abstract We have developed a bootstrap method to estimate errors associated with inverting SKS waveforms for shear-wave splitting parameters. Although presented for shear-wave splitting inversions, this method is suitable for any waveform inversion procedure.
Eric Sandvol, Thomas Hearn
openaire   +1 more source

Shear-wave splitting near Guam

Physics of the Earth and Planetary Interiors, 1992
Abstract Polarities of shear waves from intermediate-focus events underneath Guam are studied. For records from a group of ten events, shear-wave splitting with faster-arriving E-W components are observed. This event group occurred within, or above, one geographic portion of the Wadati-Benioff zone, with depths ranging between 57 and 148 km.
openaire   +1 more source

Evaluation of anisotropy by shear-wave splitting

Geophysics, 1985
Abstract The polarizations of three-component shear wave-trains carry unique information about the internal structure of the rock through which they pass: specifically, commonly observed shear-wave splitting may contain information about the orientation of crack distributions.
openaire   +1 more source

Error in shear‐wave polarization and time splitting

Geophysical Prospecting, 2004
ABSTRACTShear‐wave polarization and time delay are attributes commonly used for fracture detection and characterization. In time‐lapse analysis these parameters can be used as indicators of changes in the fracture orientation and density. Indeed, changes in fracture characteristics provide key information for increased reservoir characterization and ...
Gwénola Michaud, Roel Snieder
openaire   +1 more source