Modeling P-Rg conversions from isolated topographic features near the NORESS array


Using the T-matrix, or extended boundary condition, method, seismic-wave scattering is modelled from earth models with one-dimensional (1D) isolated topographic features. This study is motivated by observations suggesting that surface topography generates coda waves, which are relatively large-amplitude arrivals following major seismic phases. For sinusoidal periodic surfaces, large-amplitude anomalies in the surface displacement spectrum correspond to P-to-Rayleigh (P-Rg), S-to-Rayleigh (S-Rg), and other mode conversions. For isolated topographic features, these conversions still exist. Teleseismic P-Rg conversions from isolated hills were modelled in order to understand and confirm the origin of observed conversions near the NORESS array. -from Authors

Publication Title

Bulletin - Seismological Society of America

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