共查询到20条相似文献，搜索用时 14 毫秒
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In recent years the use of synthetic seismograms calculated for radially stratified models has gained increasing popularity as a means of placing further constraints on the velocity structure of the Earth's mantle. Such synthetics do. however, have a number of limitations. At short periods (∼1 s) the amplitudes as well as the wave shapes of travel-time branches are affected by seismograph siting, the structure immediately beneath the seismograph and any laterally heterogeneous structure in the mantle. Later arrivals can also be masked by signal-generated noise and by extended source times. At longer periods (∼-20 s) the larger wavelengths reduce the sensitivity of amplitudes and waveforms to contaminating effects. As a result the use of long-period synthetics can only lead to the resolution of the gross features of the Earth's interior. 相似文献
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RESEARCH NOTE Stacking three-component seismograms 总被引：1，自引：0，他引：1
B. L. N. Kennett 《Geophysical Journal International》2000,141(1):263-269
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David Al-Attar 《Geophysical Journal International》2007,171(2):755-760
A formal solution to the elastodynamic equation in an anelastic earth model is presented. The derivation also incorporates the effects of aspherical structure, rotation, self-gravitation, and pre-stress. It is found that the solution can be expressed as a sum of the normal modes of the earth model along with additional terms accounting for anelastic relaxation processes. However, the derivation does not assume that such an eigenfunction expansion is possible, and so avoids difficulties previously encountered due to the non self-adjointness of the problem. 相似文献
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Efficient calculation of differential seismograms for lithospheric receiver functions 总被引：18，自引：0，他引：18
G. E. Randall 《Geophysical Journal International》1989,99(3):469-481
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Kazuki Kohketsu 《Geophysical Journal International》1987,89(3):821-838
Summary. The reflectivity method for complete SH seismograms has been extended to two-dimensionally layered structures. The Aki-Larner technique is generalized to solve the integral equations for 2-D boundary conditions, and propagator matrices are enlarged to express a total SH wavefield. Synthetic seismograms in a soft basin are calculated for an incident plane-wave. They compare favourably with the results of the finite-element and finite-difference methods even in the later portion where asymptotic ray and beam theories break down. Synthetic seismograms due to a line force and a point dislocation are also presented. 相似文献
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Coda Q In the Eastern Caribbean, West Indies 总被引：1，自引：0，他引：1