Imaging and characterization of heterogeneous landfills using geophysical methods

Nowadays many countries use landfilling for the management of their waste or for treating old landfills. Emissions from landfills can be harmful to the environment and to human health, making the stabilization of landfills a priority for the landfill communities. Estimation of the emission potential for determination of the aftercare period and...

Shear wave seismic interferometry for lithospheric imaging: Application to southern Mexico

Seismic interferometry allows for the creation of new seismic traces by cross correlating existing ones. With sufficient sampling of remote-source positions, it is possible to create a virtual source record by transforming a receiver location into a virtual source. The imaging technique developed here directly retrieves reflectivity information...

Estimating the location of a tunnel using correlation and inversion of Rayleigh wave scattering

The investigation of near-surface scatterers, such as cavities, tunnels, abandoned mine shafts, and buried objects, is important to mitigate geohazards and environmental hazards. By inversion of travel times of cross-correlated scattered waves, due to the incident Rayleigh waves, we estimate the location of a near-surface tunnel from seismic...

Surface-wave retrieval using Seismic Interferometry by multi-dimensional deconvolution

In this thesis, seismic interferometry by multi dimensional deconvolution is used to retrieve the surface-wave response from a virtual source to a receiver by using the observations due to, often passive, noise sources located elsewhere. The virtual source response is used to retrieve the phase velocity, a property used for shallow subsurface...

Downhole interferometric illumination diagnosis and balancing

With seismic interferometry or the virtual source method, controlled sources can be redatumed from the Earth’s surface to generate so-called virtual sources at downhole receiver locations. Generally this is done by crosscorrelation of the recorded down-hole data and stacking over source locations. By studying the retrieved data at zero time lag,...

Interferometric redatuming by multidimensional deconvolution

Seismic reflection imaging is a popular method to image, characterize and monitor the Earth's subsurface. In this method, seismic signals are sent into the subsurface and their reflections are collected. Strong heterogeneities in upper sections of the subsurface often pose a problem for imaging deeper sections. To overcome these problems, it has...

Body-wave seismic interferometry applied to earthquake- and storm-induced wavefield

Seismology is the study of the vibration of the Earth. Seismologists pay much attention to the main source of Earth vibration: earthquakes. But also other seismic sources, like mining blasts, ocean storms and windmills, are studied. All these sources induce seismic waves, which can eventually be recorded as ground vibrations. These seismic...