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Your search keyword '"Kaipio, J. P."' showing total 176 results
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176 results on '"Kaipio, J. P."'

2. Prior Variances and Depth Un-Biased Estimators in EEG Focal Source Imaging

Author

Koulouri, A., Rimpiläinen, V., Brookes, M., Kaipio, J. P., Magjarevic, Ratko, Editor-in-chief, Ładyżyński, Piotr, Series editor, Ibrahim, Fatimah, Series editor, Lacković, Igor, Series editor, Rock, Emilio Sacristan, Series editor, Eskola, Hannu, editor, Väisänen, Outi, editor, Viik, Jari, editor, and Hyttinen, Jari, editor

Published
2018
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15. A numerical approach for modelling fault-zone trapped waves.

Author

Gulley, A. K., Kaipio, J. P., Eccles, J. D., and Malin, P. E.

Subjects
*FAULT zones, *DISPERSION (Atmospheric chemistry), *WAVE analysis, *SHEAR waves, *FINITE element method, *BOUNDARY value problems
Abstract

We develop a computationally efficient approach to compute the waveforms and the dispersion curves for fault-zone trapped waves guided by arbitrary transversely isotropic across-fault velocity models. The approach is based on a Green's function type representation for FL and FR type fault-zone trapped waves. The model can be used for simulation of the waveforms generated by both infinite line sources (2-D) and point sources (3-D). The numerical scheme is based on a high order finite element approximation and, to increase computational efficiency, we make use of absorbing boundary conditions and mass lumping of finite element matrices. [ABSTRACT FROM AUTHOR]

Published
2017
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16. The effect of gradational velocities and anisotropy on fault-zone trapped waves.

Author

Gulley, A. K., Eccles, J. D., Kaipio, J. P., and Malin, P. E.

Subjects
FAULT zones, SHEAR waves, SEISMIC anisotropy, STATISTICAL smoothing, WAVEGUIDES
Abstract

Synthetic fault-zone trapped wave (FZTW) dispersion curves and amplitude responses for FL (Love) and FR (Rayleigh) type phases are analysed in transversely isotropic 1-D elastic models. We explore the effects of velocity gradients, anisotropy, source location and mechanism. These experiments suggest: (i) A smooth exponentially decaying velocity model produces a significantly different dispersion curve to that of a three-layer model, with the main difference being that Airy phases are not produced. (ii) The FZTW dispersion and amplitude information of a waveguide with transverse-isotropy depends mostly on the Shear wave velocities in the direction parallel with the fault, particularly if the fault zone to country-rock velocity contrast is small. In this low velocity contrast situation, fully isotropic approximations to a transversely isotropic velocity model can be made. (iii) Fault-aligned fractures and/or bedding in the fault zone that cause transverse-isotropy enhance the amplitude and wave-train length of the FR type FZTW. (iv) Moving the source and/or receiver away from the fault zone removes the higher frequencies first, similar to attenuation. (v) In most physically realistic cases, the radial component of the FR type FZTW is significantly smaller in amplitude than the transverse. [ABSTRACT FROM AUTHOR]

Published
2017
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