Print Email Facebook Twitter Multi-objective full waveform inversion in the absence of low frequencies Title Multi-objective full waveform inversion in the absence of low frequencies Author Bharadwaj, P. Mulder, W.A. Drijkoningen, G.G. Faculty Civil Engineering and Geosciences Department Geoscience & Engineering Date 2013-10-01 Abstract Least-squares inversion of seismic reflection waveforms can reconstruct remarkably detailed models of the Earth’s subsurface. However, the cycle-skipping associated with the highfrequency waveforms are responsible for spurious local minima in its objective function. Therefore, it is often difficult for descent methods to converge to the true model without starting from an accurate large-scale velocity estimate. To partially overcome this difficulty, we propose to use multiple objective functions for inversion. An additional constraint based on cross-correlation is added to the conventional least-squares (LS) inversion. Observations suggest this will result in a model with an accurate background velocity and reflectivity that corresponds to the global minimum of the least-squares objective function. Optimization of a cross-correlation based function (CC) in the data domain appears to pull the trapped solution out of the local minima associated with the least-squares objective function, and vice versa. Some 2-D numerical tests confirm the validity of the approach in the absence of low temporal data frequencies, starting from a constant initial velocity model. Subject acousticimaginginversionreflectionfull-waveform inversion To reference this document use: http://resolver.tudelft.nl/uuid:afff2ad5-eeaa-45a5-b00a-360fc2063a2a DOI https://doi.org/10.1190/segam2013-1011.1 Publisher Society of Exploration Geophysicists ISSN 1052-3812 Source SEG Technical Program Expanded Abstracts 2013 Part of collection Institutional Repository Document type journal article Rights © 2013 SEG Files PDF Drijkoningen_2013.pdf 857.95 KB Close viewer /islandora/object/uuid:afff2ad5-eeaa-45a5-b00a-360fc2063a2a/datastream/OBJ/view