Approximation of surface wave mode conversion at a passive continental margin by a mode-matching technique

Details Approximation of surface wave mode conversion at a passive continental margin by a mode-matching technique Approximation of surface wave mode conversion at a passive continental margin by a mode-matching technique

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.141...12m&link_type=abstract

Geophysical Journal International, Volume 141, Issue 1, pp. 12-24.

Astronomy and Astrophysics

Astronomy

5

Continental Margin, Mode Coupling, Seismic Wave Propagation, Surface Waves, Synthetic Seismograms

Scientific paper

At a continental margin sharp structural changes cause strong lateral heterogeneityin S-wave velocity, P-wave velocity and density. Therefore, mode conversion of surface wave modes is expected. Passive continental margins may be modelled by vertical discontinuities. Mode conversion is then expressed in terms of reflection and transmission coefficients. Long-period seismograms are calculated by mode summation over incident, reflected and transmitted modes. Reflection and transmission coefficients for surface waves are approximated by a mode-matching technique that is adapted to a spherical earth model. An orthogonality relation for surface wave eigenfunctions on a spherical earth is given that allows one to simplify the linear system of equations for the determination of reflection and transmission coefficients. Transmission of fundamental Love and Rayleigh modes is strongly influenced by upper crustal heterogeneity for frequencies larger than 40Hz for fundamental Love modes and larger than 60Hz for fundamental Rayleigh modes. Mode conversion to neighbouring modes can be strong but mode conversion is not necessarily confined to neighbouring modes. Fundamental modes in particular can couple with more distant higher modes. In synthetic seismograms calculated for epicentral distances up to 40 deg, mode conversion between higher modes and fundamental modes results inshear-coupled Rayleigh waves.

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