Cross-dependence of finite-frequency compressional waveforms to shear seismic wave speeds |
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| Authors: | Zhigang Zhang Yang Shen |
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| Institution: | Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882,;USA. E-mail: |
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| Abstract: | Seismic tomography has been one of the primary tools to image the interior of the earth and other elastic structures. To date the inversions of compressional ( P ) and shear ( S ) wave speeds have been carried out separately under the assumption that P traveltimes are affected only by the P wave speed of the elastic media and S traveltimes by the S wave speed. Using numerical and analytical solutions, we show that for finite-frequency seismic waves, S wave speed perturbations may have significant effects on P waveforms. This suggests that when waveform-derived traveltime and amplitude anomalies are used in tomographic inversions, the P -wave measurements should be related to not only P wave speed perturbations but also S wave speed perturbations. |
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| Keywords: | Seismic tomography Computational seismology Theoretical seismology Wave scattering and diffraction Wave propagation |
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