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    Anisotropic traveltime tomography for depth consistent ... ; Close mobile search navigation. Article navigation. Volume 22, Number 2 A simple anisotropy correction procedure for acoustic wood ... ; successful application of travel time tomography, an increasingly popular technique for non-destructive test-ing of living trees. We have developed a simplecorrection scheme that removes first-order anisotropy effects. The corrected travel-time data can be inverted with isotropic inversion codes that are commercially available. Using a numerical experiment, we demonstrate the conse-quences … Novel anisotropic teleseismic body-wave tomography code ... ; by the means of travel-time tomography as well. Nevertheless, most of the tomography studies neglect the Nevertheless, most of the tomography studies neglect the body-wave anisotropy completely or they are limited to either azimuthal or radial anisotropy. First-arrival traveltime tomography for anisotropic media ... ; Conventionally, traveltime tomography using transmission data has been widely used for static corrections and obtaining near-surface models for seismic depth imaging. Representing anisotropic subduction zones with isotropic ... ; Using approximate anisotropy, fields can result in reduced RMS misfit to the travel time delays and reduced abundance and severity of imaging artifacts. We propose that the use of anisotropy fields derived from geodynamic modeling and constrained by seismic observables may constitute a viable alternative to isotropic tomography that does not require the inversion for anisotropy parameters in … Anisotropic 3‐D Ray Tracing and Its Application to Japan ... ; Applying our technique to a model of radial anisotropy tomography of the Japan subduction zone, we find visible travel time and raypath differences due to variations of the 3‐D isotropic velocity and radial anisotropy, but the travel time difference caused by the radial anisotropy is generally <~0.1 s and the raypath difference is generally <20 km. Non-linear traveltime inversion for 3-D seismic tomography ... ; To image anisotropic media, one should take into account the anisotropic properties so as to make 3-D seismic traveltime tomography applicable for such situations. Representing anisotropic subduction zones with isotropic ... ; The synthetic data we invert include the travel-time effects of both the target isotropic structure and the potentially contaminating seismic anisotropy, enabling us to compare the relative contri- … Abstract - file.scirp.org ; (1997) Nonuniqueness of Two-Dimensional Anisotropic Tomography Seismological Society of America Bulletin 87, 261-264. 10 Menke, W. (2015) Equivalent Heterogeneity Analysis as a Tool for Understanding the Resolving Power of Anisotropic Travel Time Tomography. Travel Time Inversion in Seismic Tomography ; Travel Time Inversion in Seismic Tomography S. Padina, D. Churchill, R. P. Bording March 2, 2006 1 Introduction The word tomography finds its origins inthe two …ANISOTROPIC Pn TOMOGRAPHY OF TURKEY AND … ; n travel time residuals used to image lateral variations of seismic velocity within the uppermost mantle of region is determined. Both isotropic and anisotropic velocity distributions and estimated variations of the crustal thickness computed. P n Pre-Stack Depth Migration - Spectrum Geo ; This travel time may correspond to either the ray with the shortest travel time or the ray with the maximum energy. Ray trace travel times are also available. Typical parameters to test prior to running a production Kirchhoff migration include the aperture, the dip limits, the anti-alias filter etc. TOMOGRAPHY AND LOCATION PROBLEMS IN CHINA USING … ; TOMOGRAPHY AND LOCATION PROBLEMS IN CHINA USING REGIONAL TRAVEL-TIME DATA ... studies have also been made by plotting out travel time curves for three different regions of China. We ... Pn anisotropy beneath china. Line segments show the orientation of the anisotropic fast direction; line lengths show the magnitude of the anisotropy. Tomographic Pn Velocity and Anisotropy Structure in the ... ; as to test their quality. Finally, by applying a 6 sec residual cut to the straight line fit of the travel times versus distance, 19,166 Pn-phase readings were screened out for the inver-sion of our models. This fit line yielded an average Pn ve-locity of 8:1 km=sec in the … Anisotropic resistivity tomography. - Research Portal ... ; Average conductivities range from 0.001 S m−1 (= 1000 Ω m) to 0.003 S m−1 (= 333 Ω m) and anisotropy values range from 0 per cent to more than 300 per cent. As an independent test of the reliability of the structures revealed by anisotropic electric tomography, anisotropic … EGU2012-6909 Multi-scale Isotropic/anisotropic tomography ... ; Multi-scale Isotropic/anisotropic tomography of Taiwan using seismic ambient noises ... resulting anisotropy is supported by the synthetic test and experiments of various azimuthal weighting schemes. In the shorter periods (5, 8, 12 s) of our anisotropy model, the fast axes of anisotropy are highly ... Hydraulic conductivity identification by EnKF and travel ... ; test 3 12 -0.5 0.75 8 test 4 8 -0.5 0.75 ∞ test 5 8 -0.5 0.75 4 • A tracer test is simulated by assuming an instantaneous solute injection in a well of diameter 0.5L, vertical extension of 6L,and centered in x =0.875L and y = 4.125L (Fig.2). • The CP is perpendicular to the flow direction, located at x=2.375L and divided in n sCP. • The travel time of all the particles A Fast and Reliable Method for Surface Wave Tomography ... ; Such maps have at least two purposes in monitoring the nuclear Comprehensive Test-Ban Treaty (CTBT): (1) They can be used as data to estimate the shear velocity of the crust and uppermost mantle and topography on internal interfaces which are important in event location, and (2) they can be used to estimate surface-wave travel-time correction surfaces to be used in phase-matched filters designed to … Anisotropic imaging performance in breast tomosynthesis ... ; We describe the anisotropy in imaging performance caused by oblique x-ray incidence in indirect detectors for breast tomosynthesis based on columnar scintillator screens. We use MANTIS, a freely available combined x-ray, electron, and optical Monte Carlo transport package which models the … Reliability of mantle tomography models assessed by ... ; Reliability of mantle tomography models 131. (a) (b) Figure 5. Test of the effect of replacing CRUST2.0 Moho depth under ocean with PREM Moho depth on the vertical component. Black line: the Moho depth is 10 km; red line: the Moho depth is 24.4 km. (a) The event is … 3-D Transient Hydraulic Tomography in Unconfined … ; 3-D Transient Hydraulic Tomography in Unconfined Aquifers with Fast Drainage Response Michael Cardiff ... 3-D transient hydraulic tomography in unconfined aquifers with fast drainage response M. Cardiff1,2 and W. Barrash1 Anisotropic effects on the near-surface seismic imaging ; Anisotropic effects on the near-surface seismic imaging . Lina Zhang*, Jie Zhang, University of Science and Technology of China; Wei Zhang, GeoTomo . Summary . Anisotropic velocity models have been widely applied in the subsurface seismic imaging except for the near surface area. The near surface is often assumed to be isotropic, and (PDF) P wave velocity structure below India and Tibet ... ; 3. Results Travel time corrections to P wave delay times due to azimuthal anisotropy are found to be in the range of 20.3 to 10.5 s. 3D Model-based Tomography - Paradigm Ltd. ; 3D Model-based Tomography Update subsurface velocity and anisotropic material parameters, and depth of structural horizons, along the structural model. In 3D model-based tomography, velocity parameters are represented along the depth model horizons. The velocity parameters and the depth structure are updated along the background structural model. ケッチ テキスト
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  • #7
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