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Abstract

We present a parametric analysis of 2D elastic frequency-domain full-waveform inversion of passive teleseismic data for lithospheric imaging. In the framework of teleseismic experiments, the sources are few compressional plane waves, which impinges the base of the lithospheric target located below the receiver arrays. To overcome the narrow aperture illumination provided by such source-receiver configuration, P and SV converted waves at the free-surface, acting as secondary sources, are crucial for increasing the illumination of the target zone. The P and S wavespeeds are jointly updated during the inversion. The resolution of the P and S wave-velocity models is dramatically improved when free-surface effects are involved in the inversion. A hierarchical inversion procedure of finely sampled frequency groups prevents spatial aliasing in depth, while the inversion is less sensitive to the sampling of the incidence angles of the plane-wave sources. The receiver interval must be lower than half the shear wavelengths in the near surface to prevent horizontal aliasing artifacts in the S-wave velocity model. A key feature of teleseismic experiments is the low frequency content of the source (0.05 - 1 Hz), which should allow one to use simple initial models without cycle skipping artifacts.

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/content/papers/10.3997/2214-4609.20148669
2012-06-04
2024-03-28
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20148669
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