Full waveform inversion of the African crust and mantle: strategies for accelerating model convergence

Master of Science in Applied Geophysics at Delft University of Technology, ETH Zürich and RWTH Aachen University. - The continent of Africa is one of the most geophysically interesting regions on the planet. More specifically, Africa contains the Afar Depression, which is the only place on Earth where incipient sea-floor spreading is sub...

Seismic depth imaging of sea-level controlled depositional sequences at the New Jersey shelf

This master thesis is part of a joint project carried out at TU Bergakademie Freiberg and RWTH Aachen University, aspiring to simulate numerically the fresh water emplacement and recharge system at the New Jersey shelf. Analyses of data, acquired during the most recent seismic drilling campaign IODP Leg 313 at the New Jersey shelf, revealed...

Data driven Orientation Determination of Multicomponent Seismic Sensors

The orientation of a three component sensor in seabed seismic needs to be known to successfully process the acquired data. Although it is often measured, the data processing centers are requested to estimate it when these measurements are corrupted or to validate them. A large class of methods used in the industry perform well in the presence of...

Electromagnetic & Seismoelectric sensitivity analysis using resolution functions

In the field of exploration geophysics various methods are applied to determine the physical properties of the subsurface of the Earth. Some of the methods most widely used are seismic and electromagnetic surveys, which are each used according to the type of information that is being sought and their ability to provide that information. The...

Merging active and passive seismic reflection data with interferometry by multidimensional deconvolution

Seismic interferometry, also referred to as Green's function retrieval by crosscorrelation, is a technique with many applications, such as for the reconstruction of surface seismic, VSP, to Ocean-Bottom data using active or passive data. Due to the impurity of the Green's function retrieved in the presence of one-sided illumination or intrinsic...

Analysis of 2D homogeneous space solutions of the seismoelectric P-SV-TM mode for interferometric purposes

Seismic and electromagnetic imaging methods both provide the geophysicist with different types of medium parameters. Seismic methods are sensitive to the elastic properties of the medium, while electromagnetic methods are sensitive to the electric properties. In porous-saturated media, these two wave fields occur as a coupled system, which is...