共查询到20条相似文献，搜索用时 562 毫秒
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Ray tracing in factorized anisotropic inhomogeneous media 总被引：1，自引：0，他引：1
V. &#;ervený 《Geophysical Journal International》1989,99(1):91-100
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Ray tracing in random media 总被引：1，自引：0，他引：1
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Pseudo-bending method for three-dimensional seismic ray tracing in a spherical earth with discontinuities 总被引：7，自引：0，他引：7
We present a 'pseudo-bending' approach to 3-D ray tracing in a spherical earth with discontinuities. This method is based on a three-point perturbation associated with a first-order approximation, while Snell's law in curvilinear coordinates is applied at the discontinuities. We demonstrate the computational accuracy and efficiency of the pseudo-bending method in tracing rays for various velocity models by comparing results with analytical solutions and with results from the bending method. The improvement of efficiency is significant, but is reduced as the number of discontinuities increases. Since the bending approach may be computationally unstable in some situations, even though it is exact, the pseudo-bending approach is preferable for automatic calculation of rays. 相似文献
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Geocentre motion from the DORIS space system and laser data to the Lageos satellites: comparison with surface loading data 总被引：3，自引：0，他引：3
F. Bouillé A. Cazenave J. M. Lemoine J. F. Crétaux 《Geophysical Journal International》2000,143(1):71-82
Surface mass redistribution within the Earth system, especially in the atmosphere, oceans, continents and ice sheets, causes the position of the centre of mass to vary in a reference frame attached to the solid Earth. Space techniques are now precise enough to measure the centre of mass motion. Here we present a determination of the centre of mass coordinates at regular monthly intervals using DORIS data on SPOT‐2, SPOT‐3 and Topex–Poseidon (1993–1997) and laser data on Lageos‐1 and Lageos‐2 (1993–1996). The amplitude and phase of the space‐geodesy‐derived annual cycle for each coordinate are further compared to estimates based on surface mass redistribution at the Earth surface derived from various climatic data sources: surface pressure, soil moisture, snow depth and ocean mass variations. 相似文献
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Bending method revisited: a Hamiltonian approach 总被引：4，自引：0，他引：4
Véronique Farra 《Geophysical Journal International》1992,109(1):138-150
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Ray tracing in anisotropic media with singularities 总被引：2，自引：0，他引：2
Václav Vavry&#;uk 《Geophysical Journal International》2001,145(1):265-276
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Ray Tracing In 3-D Media By Parameterized Shooting 总被引：5，自引：0，他引：5
Yonghe Sun 《Geophysical Journal International》1993,114(1):145-155
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