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Rahimi Dalkhani, A. (author), Áústsdóttir, Thorbjörg (author), Gudnason, Egill Árni (author), Hersir, Gylfi Páll (author), Zhang, Xin (author), Weemstra, C. (author)Ambient noise seismic tomography has proven to be an effective tool for subsurface imaging, particularly in volcanic regions such as the Reykjanes Peninsula (RP), SW Iceland, where ambient seismic noise is ideal with isotropic illumination. The primary purpose of this study is to obtain a reliable shear wave velocity model of the RP, to get a...journal article 2023
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Kawasaki, Y. (author), Minato, S. (author), Ghose, R. (author)Bulk-density ( ρ) of soil is an important indicator of soil compaction and type. A knowledge of the spatial variability of in situ soil density is important in geotechnical engineering, hydrology and agriculture. Surface geophysical methods have so far shown limited success in providing an accurate and high-resolution image of 3-D soil...journal article 2023
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Shirmohammadi, F. (author), Draganov, D.S. (author)High-resolution seismic reflections are essential for imaging and monitoring applications using data-driven methods such as seismic interferometry (SI) and Marchenko redatuming. For seismic land surveys using sources and receivers at the surface, the surface waves are the dominant noises that mask the reflections. We use SI to suppress surface...abstract 2023
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van Meerkerk, M. (author)The prospect of stricter national and international emission standards for the shipping industry are a driving force in the search for alternative shipping fuels, such as liquefied natural gas (LNG). However, new challenges arise with the widespread use of LNG. For example, there is a desire to use LNG cargo containment...doctoral thesis 2021
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Rahimi Dalkhani, A. (author), Zhang, Xin (author), Weemstra, C. (author)Seismic travel time tomography using surface waves is an effective tool for three-dimensional crustal imaging. Historically, these surface waves are the result of active seismic sources or earthquakes. More recently, however, surface waves retrieved through the application of seismic interferometry have also been exploited. Conventionally, two...journal article 2021
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Huloux, Nicolas (author), Willemet, L. (author), Wiertlewski, M. (author)The contact between the fingertip and an object is formed by a collection of micro-scale junctions, which collectively constitute the real contact area. This real area of contact is only a fraction of the apparent area of contact and is directly linked to the frictional strength of the contact (i.e., the lateral force at which the finger...journal article 2021
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Stumpf, Martin (author), Lager, I.E. (author)The electric-line-source excited, pulsed electromagnetic (EM) field response on the surface of a highly contrasting thin sheet with dielectric and conductive properties is studied analytically in the time domain (TD) with the aid of the Cagniard-De Hoop technique. Closed-form TD expressions reveal anomalous highly oscillatory EM transients...journal article 2021
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Shirmohammadi, F. (author), Draganov, D.S. (author), Hatami, Mohammad Reza (author), Weemstra, C. (author)Seismic interferometry (SI) refers to the principle of generating new seismic responses using crosscorrelations of existing wavefield recordings. In this study, we report on the use of a specific interferometric approach, called seismic interferometry by multidimensional deconvolution (SI by MDD), for the purpose of retrieving surface-wave...journal article 2021
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Neto, A. (author), Fiorellini Bernardis, A. (author), Emer, Diego (author), Freni, Angelo (author), Llombart, Nuria (author)The observable field is defined as the portion of the incident field that can contribute to the power received by an antenna. Recently, the observable field was estimated for a plane wave incidence. Here, the procedure is extended to a general incident field expressed as a superposition of homogeneous plane waves. The observable field concept...journal article 2020
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Weemstra, C. (author), De Laat, Janneke I. (author), Verdel, Arie (author), Smets, P.S.M. (author)Instrumental timing and phase errors are a notorious problem in seismic data acquisition and processing. These can be frequency independent, for example due to clock drift, but may also be frequency dependent, for example due to imperfectly known instrument responses. A technique is presented that allows both types of errors to be recovered...journal article 2020
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Wellens, P.R. (author), Borsboom, Mart (author)The boundaries of numerical domains for free-surface wave simulations with marine structures generate spurious wave reflection if no special measures are taken to prevent it. The common way to prevent reflection is to use dissipation zones at the cost of increased computational effort. On many occasions, the size of the dissipation area is...journal article 2020
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Lu, T. (author), Metrikine, A. (author), Steenbergen, M.J.M.M. (author)A periodically supported beam on a visco-elastic half-space is considered to model the vibration of railway tracks. The viscosity of the half-space is assumed to be of the Kelvin-Voigt type. Making use of the concept of equivalent dynamic stiffness, the reaction of the half-space to the sleepers is replaced by a system of identical spring...journal article 2020
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Balestrini, F.I. (author), Draganov, D.S. (author), Malehmir, Alireza (author), Marsden, Paul (author), Ghose, R. (author)In mineral exploration, new methods to improve the delineation of ore deposits at depth are in demand. For this purpose, increasing the signal-to-noise ratio through suitable data processing is an important requirement. Seismic reflection methods have proven to be useful to image mineral deposits. However, in most hard rock environments,...journal article 2020
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van Meerkerk, M. (author), Poelma, C. (author), Hofland, Bas (author), Westerweel, J. (author)We present an experimental study on the variation in wave impact location and present a mechanism for the development of free surface instabilities on the wave crest for repeatable plunging wave impacts on a vertical wall. The existence of free surface instabilities on an impacting wave is well known, but their characteristics and formation...journal article 2020
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Armstrong, Michael (author), Ravasio, Matteo (author), Versteijlen, W.G. (author), Verschuur, D.J. (author), Metrikine, A. (author), van Dalen, K.N. (author)Determination of soil material damping is known to be difficult and uncertain, especially in the offshore environment. Using an advanced inversion methodology based on multichannel spectral analysis, Scholte and Love wave measurements are used to characterize subsea soil from a North Sea site. After normalization, a determinant-based objective...journal article 2020
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- Shirmohammadi, F. (author), Weemstra, C. (author), Draganov, D.S. (author), Wapenaar, C.P.A. (author) poster 2019
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Prins, Peter J. (author), Wahls, S. (author)Several non-linear fluid mechanical processes, such as wave propagation in shallow water, are known to generate solitons: localized waves of translation. Solitons are often hidden in a wave packet at the beginning and only reveal themselves in the far-field. With a special signal processing technique known as the non-linear Fourier transform ...journal article 2019
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Martins, Joana E. (author), Weemstra, C. (author), Ruigrok, Elmer (author), Verdel, Arie (author), Jousset, Philippe (author), Hersir, Gylfi (author)Tomographic imaging based on ambient seismic noise measurements has shown to be a powerful tool, especially in areas like Iceland, where the microseism illumination is excellent. In this paper, we produce a 3D S-wave tomographic image over the western Reykjanes Peninsula high-enthalpy geothermal fields and evaluate the reliability of the...journal article 2019
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Ponomarenko, A. V. (author), Kashtan, B. M. (author), Troyan, V. N. (author), Mulder, W.A. (author)Surface waves are often used to estimate a near-surface shear-velocity profile. The inverse problem is solved for the locally one-dimensional problem of a set of homogeneous horizontal elastic layers. The result is a set of shear velocities, one for each layer. To obtain a P-wave velocity profile, the P-guided waves should be included in the...journal article 2017
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Kruiver, Pauline P. (author), van Dedem, Ewoud (author), Romijn, Remco (author), de Lange, Ger (author), Korff, M. (author), Stafleu, Jan (author), Gunnink, Jan L. (author), Rodriguez-Marek, Adrian (author), Bommer, Julian J. (author), van Elk, Jan (author), Doornhof, Dirk (author)A regional shear-wave velocity (V<sub>S</sub>) model has been developed for the Groningen gas field in the Netherlands as the basis for seismic microzonation of an area of more than 1000 km<sup>2</sup>. The V<sub>S</sub> model, extending to a depth of almost 1 km, is an essential input to the modelling of hazard and risk due to induced...journal article 2017