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Near-surface Q Estimation from Surface Waves and Compensation for its Effects on Body Waves
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
The near-surface weathering zone is typically made up of dissipative and low-velocity materials. This strongly affects the propagation of body waves, not only perturbing traveltimes (statics), but also reducing amplitude and altering phase through absorption. Building a reliable near-surface model in terms of visco-elastic properties can allow a better understanding of the perturbations occurring in the near surface and provide opportunities for their correction during data processing.
Since surface-wave propagation is sensitive to the properties of shallow layers, surface-wave energy can be analysed and inverted for near-surface model building. In this work, we describe a method that uses surface-wave analysis and inversion to estimate P- and S-wave velocities and quality factors. We use the obtained visco-elastic near-surface model to compensate body waves according to a surface-consistent inverse-Q filtering scheme.