SPECTRAL-ELEMENT SIMULATIONS OF GLOBAL SEISMIC WAVE PROPAGATION-I. VALIDATION
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dc.contributor.author | Komatitsch D. | |
dc.contributor.author | Tromp J. | |
dc.date.accessioned | 2021-05-08T05:11:59Z | |
dc.date.available | 2021-05-08T05:11:59Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5141553 | |
dc.identifier.citation | Geophysical Journal International, 2002, 149, 2, 391-411 | |
dc.identifier.issn | 0956-540X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28444 | |
dc.description.abstract | We use a spectral-element method to simulate seismic wave propagation throughout the entire globe. The method is based upon a weak formulation of the equations of motion and combines the flexibility of a finite-element method with the accuracy of a global pseudospectral method. The finite-element mesh honours all first- and second-order discontinuities in the earth model. To maintain a relatively constant resolution throughout the model in terms of the number of grid points per wavelength, the size of the elements is increased with depth in a conforming fashion, thus retaining a diagonal mass matrix. In the Earth's mantle and inner core we solve the wave equation in terms of displacement, whereas in the liquid outer core we use a formulation based upon a scalar potential. The three domains are matched at the inner core and core-mantle boundaries, honouring the continuity of traction and the normal component of velocity. The effects of attenuation and anisotropy are fully incorporated. The method is implemented on a parallel computer using a message passing technique. We benchmark spectral-element synthetic seismograms against normal-mode synthetics for a spherically symmetric reference model. The two methods are in excellent agreement for all body- and surface-wave arrivals with periods greater than about 20 s. | |
dc.subject | BODY WAVES | |
dc.subject | ELASTODYNAMICS | |
dc.subject | GLOBAL SEISMOLOGY | |
dc.subject | NUMERICAL TECHNIQUES | |
dc.subject | SEISMIC WAVE PROPAGATION | |
dc.subject | SURFACE WAVES | |
dc.title | SPECTRAL-ELEMENT SIMULATIONS OF GLOBAL SEISMIC WAVE PROPAGATION-I. VALIDATION | |
dc.type | Статья |
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