Surface wave inversion by wave field reconstruction and wave equation inversion

Authors
Ali Shaiban (University of Edinburgh) | Sjoerd de Ridder (University of Edinburgh) | Andrew Curtis (University of Edinburgh)
Document ID
SEG-2018-2994958
Publisher
Society of Exploration Geophysicists
Source
2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
Publication Date
2018
Document Type
Conference Paper
Language
English
Copyright
2018. Society of Exploration Geophysicists
Keywords
Surface wave, Inversion, Near surface, Full-waveform inversion, Gradiometry
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We present an inversion scheme for surface waves that jointly inverts point-receiver data for both a densely reconstructed wave field and an estimate of seismic velocities. The formulation is posed as a partial differential equation (PDE) constrained inverse problem. We use the dispersive Helmholtz equation to approximate the far-field behavior of surface waves as two dimensional wave propagation through a phase velocity map. The Helmholtz equation does not accurately describe surface wave propagation near sources so we mask source regions from the PDE constraint. This leads to excellent wave field reconstruction and medium velocity estimates. The new theory and algorithm are supported by a numerical example with simulated elastic data. The phase velocity model obtained is verified by frequency-wavenumber dispersion analysis.

Presentation Date: Tuesday, October 16, 2018

Start Time: 8:30:00 AM

Location: 204A (Anaheim Convention Center)

Presentation Type: Oral

File Size  5 MBNumber of Pages   5

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