Searched for: collection%3Air
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Van Walree, P.A. (author), Ainslie, M.A. (author), Simons, D.G. (author)
Echo energies of single-beam echo sounders are inverted for the sediment mean grain size via a combination of theoretical and empirical relationships. In situ measurements of the seafloor mass density have revealed the presence of a thin transition layer between the water and the sediment. Within this layer, which has a thickness of order 1 cm,...
journal article 2006
document
Van Dalen, K.N. (author), Drijkoningen, G.G. (author), Smeulders, D.M.J. (author)
Pseudo interface waves can exist at the interface of a fluid and a fluid-saturated poroelastic solid. These waves are typically related to the pseudo-Rayleigh pole and the pseudo-Stoneley pole in the complex slowness plane. It is found that each of these two poles can contribute (as a residue) to a full transient wave motion when the...
journal article 2010
document
Gouedard, P. (author), Roux, P. (author), Campillo, M. (author), Verdel, A.R. (author), Yao, H. (author), Van der Hilst, R.D. (author)
We use seismic prospecting data on a 40 × 40 regular grid of sources and receivers deployed on a 1 km × 1 km area to assess the feasibility and advantages of velocity analysis of the shallow subsurface by means of surface-wave tomography with Green's functions estimated from crosscorrelation. In a first application we measure Rayleigh-wave...
journal article 2011
document
Van Dalen, K.N. (author), Drijkoningen, G.G. (author), Smeulders, D.M.J. (author), Heller, H.K.J. (author), Glorieux, C. (author), Sarens, B. (author), Verstraeten, B. (author)
The interface-wave impedance and ellipticity are wave attributes that interrelate the full waveforms as observed in different components. For each of the fluid/elastic-solid interface waves, i.e., the pseudo-Rayleigh (pR) and Stoneley (St) waves, the impedance and ellipticity are found to have different functional dependencies on Young’s modulus...
journal article 2011
document
Kasililar, A. (author), Harmankaya, U. (author), Wapenaar, C.P.A. (author), Draganov, D.S. (author)
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...
journal article 2013
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