A method for non-orthogonal seismic polarization-vector separation

Physics

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Scientific paper

With the exception of the first arriving of P wave, it is difficult to make an accurate measurement of parameters such as arrival time, phase, amplitude, polarization and the waveform of later-arriving phases on three-component, high-frequency records. This is due to the mutual interference of partially overlapping phases. Most methods of studying two-component or/and three-component seismograms assume that body-wave polarizations are mutually orthogonal. This is not correct, however, in cases of anisotropic or inhomogeneous medium; nor can it be used to measure converted phases or phases reflected along different paths. To solve such problems, this paper presents a new technique called Seismic Polarization-Vector Separation (SPVS). Using an affine coordinate transform, SPVS achieves a more accurate and reliable measurement of almost all kinematic and dynamic parameters on three-component seismograms, including polarization, arrival time, amplitude and extended waveform. As a consequence, it succeeds in separating and reconstructing the phase sequence of body waves on three-component seismograms without data loss.

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