Searched for: author%3A%22Grobbe%2C+N.%22
(1 - 16 of 16)
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Muntendam-Bos, A.G. (author), Grobbe, N. (author)
For induced seismicity, the non-stationary, heterogeneous character of subsurface stress perturbations can be a source of spatiotemporal variations in the scaling of event sizes; one of the critical parameters controlling seismic hazard and risk. We demonstrate and test a systematic, statistical, penalized-likelihood approach to analysing...
journal article 2022
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Staring, M. (author), Grobbe, N. (author), van der Neut, J.R. (author), Wapenaar, C.P.A. (author)
We compare the coupled Marchenko equations without free-surface multiples to the coupled Marchenko equations including free-surface multiples. When using the conventional method of iterative substitution to solve these equations, a difference in convergence behaviour is observed, suggesting that there is a fundamental difference in the...
conference paper 2017
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Grobbe, N. (author)
In this thesis, I study coupled poroelastic waves and electromagnetic fields in layered media. The focus is two-fold:<br/>1. Increase the theoretical and physical understanding of the seismo-electromagnetic phenomenon by analytically-based numerical modeling.<br/>2. Investigate the potential of seismo-electromagnetic interferometry.<br/><br/...
doctoral thesis 2016
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Grobbe, N. (author), Slob, E.C. (author), Thorbecke, J.W. (author)
We study the accuracy and numerical stability of three eigenvector sets for modelling the coupled poroelastic and electromagnetic layered-Earth response. We use a known eigenvector set, its flux-normalized version and a newly derived flux-normalized set. The new set is chosen such that the system is properly uncoupled when the coupling between...
journal article 2016
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Grobbe, N. (author), Slob, E.C. (author)
We study if nature can help us overcome the very low signal-to-noise ratio of seismo-electromagnetic converted fields by investigating the effects of thin-bed geological structures on the seismo-electromagnetic signal. To investigate the effects of bed thinning on the seismo-electromagnetic interference patterns, we numerically simulate seismo...
journal article 2016
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Maas, P.J. (author), Grobbe, N. (author), Slob, E.C. (author), Mulder, W.A. (author)
For multi-parameter problems, such as the seismoelectric system, sensitivity analysis through resolution functions is a low-cost, fast method of determining whether measured fields are sensitive to certain subsurface parameters. We define a seismoelectric resolution function for the inversion of a bulk density perturbation. The synthetic data...
conference paper 2015
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Grobbe, N. (author), Maas, P. (author), Slob, E.C. (author), Mulder, W.A. (author)
abstract 2015
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Grobbe, N. (author), Slob, E.C. (author)
Increasing industrial and societal challenges demand a continuous need for improved imaging methods. In recent years, quite some research has been performed on using seismoelectric phenomena for geophysical exploration and imaging. Like the other methods, the seismoelectric technique also has its drawbacks. Besides the fact that the physical...
conference paper 2014
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Grobbe, N. (author), Hunziker, J.W. (author), Slob, E.C. (author)
The seismoelectric effect can be of importance for hydrocarbon exploration as it is complementary to conventional seismics. Besides enabling seismic resolution and electromagnetic sensitivity at the same time, the seismoelectric method can also provide us with additional, high-value information like porosity and permeability. However, very...
conference paper 2014
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Grobbe, N. (author), van der Neut, J.R. (author), Almagro Vidal, C. (author), Drijkoningen, G.G. (author), Wapenaar, C.P.A. (author)
Separation of recorded wavefields into downgoing and upgoing constituents is a technique that is used in many geophysical methods. The conventional, multi-component (MC) wavefield decomposition scheme makes use of different recorded wavefield components. In recent years, land acquisition designs have emerged that make use of shallow horizontal...
conference paper 2014
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Grobbe, N. (author), Slob, E.C. (author)
We have developed an analytically based, energy fluxnormalized numerical modeling code (ESSEMOD), capable of modeling the wave propagation of all existing ElectroSeismic and SeismoElectric source-receiver combinations in horizontally layered configurations. We compare the results of several of these modeled source-receiver combinations in a...
journal article 2013
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Grobbe, N. (author), Van der Neut, J. (author), Almagro Vidal, C. (author)
We present a new approach to apply wavefield decomposition, illustrated for an energy flux-normalized elastodynamic case. We start by considering a situation where two horizontal boreholes are closely separated from each other. By recording only the particle velocities at both depth levels (for example with conventional 3-component geophones)...
journal article 2013
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Van der Neut, J.R. (author), Almagro Vidal, C. (author), Grobbe, N. (author), Wapenaar, C.P.A. (author)
We present a novel method to transform seismic data with sources at the surface and receivers above and below a selected target zone in the subsurface into virtual data with sources and receivers located at the initial receiver locations. The method is based on inverting a series of multidimensional equations of the convolution- and the...
conference paper 2013
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Grobbe, N. (author), Schoemaker, F.C. (author), Schakel, M.D. (author), De Ridder, S.A.L. (author), Slob, E.C. (author), Smeulders, D.M.J. (author)
conference paper 2012
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Grobbe, N. (author), Thorbecke, J.W. (author), Slob, E.C. (author)
conference paper 2012
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Schoemaker, E.C. (author), Grobbe, N. (author), Schakel, M.D. (author), De Ridder, S.A.L. (author), Slob, E.C. (author), Smeulders, D.M.J. (author)
We experimentally validate a relatively recent electrokinetic formulation of the streaming potential (SP) coefficient as developed by Pride (1994). The start of our investigation focuses on the streaming potential coefficient, which gives rise to the coupling of mechanical and electromagnetic fields. It is found that the theoretical amplitude...
journal article 2012
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