Spectral-element simulations of global seismic wave propagation-I. Validation

Details Spectral-element simulations of global seismic wave propagation-I. Validation Spectral-element simulations of global seismic wave propagation-I. Validation

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002geoji.149..390k&link_type=abstract

Geophysical Journal International, Volume 149, Issue 2, pp. 391-411.

Astronomy and Astrophysics

Astronomy

93

: Body Waves, Elastodynamics, Global Seismology, Numerical Techniques, Seismic Wave Propagation, Surface Waves

Scientific paper

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.

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