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I am a data-driven experimental-computational seismologist. My research revolves around observational natural- and applied-geophysics to learn about the time-varying properties of the earth, at a variety of scales, and for a variety of earth and environmental issues.

… inevitably 'under construction' down here …

Seismic Noise Gradiometry

The emergence of large and dense seismic arrays that are deployed long-term, or even permanently, offer tremendous opportunities for imaging that conventional approaches fail to exploit. Dense measurements of the seismic wavefield, as recorded by today's large seismic array's, provide a direct measurement of the wavefield's derivatives in time and space. For surface waves, we can obtain the phase-velocity directly from the ratio between second-order temporal and spatial derivatives of the wavefield. This relationship holds for any kind of surface-wave wavefield, a plane wave, seismic noise, and even standing waves. Unlike seismic interferometry, this technique does not rely on cross-correlations to obtain the Green's function between two seismic receivers.

Publications and Proceeding

  • de Ridder, S.A.L., and A. Curtis (2016). Anisotropic Seismic Noise Gradiometry by Elliptically-anisotropic Wave Equation Inversion - An Example at Ekofisk: 78th EAGE Conference & Exhibition 2016 Vienna, Austria, 30 May-2 June 2016, Tu LHR5 13.
  • de Ridder, S.A.L., B.L. Biondi (2015). Near-Surface Scholte-Wave Velocities at Ekofisk from Short Noise Recordings by Seismic Noise Gradiometry, Geophysical Research Letters, Vol. 42, 8 pages.
  • de Ridder, S.A.L., and B.L. Biondi (2015). Imaging an Incoherent Wavefield without Crosscorrelations - Chaotic Wavefield Gradiometry: 77th EAGE Conference & Exhibition 2015 Madrid, Spain, 1-5 June 2015, Tu N101 06.

Love and Scholte Wave Ambient Seismic Imaging at Valhall


  • de Ridder, S.A.L., B.L. Biondi and R.G. Clapp (2014). Time-lapse seismic noise correlation tomography at Valhall, Geophysical Research Letters, Vol. 41, issue 17, 6116-6122.
  • de Ridder, S.A.L. and B.L. Biondi (2013). Daily reservoir-scale subsurface monitoring using ambient seismic noise, Geophysical Research Letters, Vol. 40, issue 12, 2969-2974.

Select Proceedings

  • de Ridder, S., B. Biondi, B. Clapp (2014). Time-lapse ambient-seismic-noise tomography at Valhall: SEG Technical Program Expanded Abstracts, 33, 2229-2234.
  • Brenders, J., J. Dellinger, O.I. Barkved, J. Mika, P. Vu, S. de Ridder, J. Yu and T. Kristiansen (2013). The Low-Frequency, Densely Sampled Wavefield in Exploration Seismology: Applications of Full-Waveform Inversion and Passive Seismic Interferometry. EarthScope National Meeting, Raleigh, North-Carolina, 13-15 May abstract.

Azimuthal Anisotropic Ambient Seismic Imaging at Ekofisk


  • de Ridder, S.A.L. and B.L. Biondi (2015). Ambient seismic noise tomography at Ekofisk, Geophysics, (accepted, July 23, 2015).
  • de Ridder, S.A.L., B.L. Biondi, and D. Nichols (2015). Elliptical-Anisotropic Eikonal Phase-Velocity Tomography, Geophysical Research Letters, Vol. 42, issue 3, 758-764.


  • de Ridder, S., B. Biondi and D. Nichols (2014). Passive seismic interferometry and anisotropic eikonal phase-velocity tomography with examples from Ekofisk field: 76th EAGE Conference & Exhibition 2014, Amsterdam, NL, 16-19 June 2014, Th E102 13.

Reservoir-Scale Seismic Interferometry

Online Lecture


  • de Ridder, S., and J. Dellinger, (2011). Ambient seismic noise eikonal tomography for near-surface imaging at Valhall, The Leading Edge, Vol. 30, 506-512.

Select Proceedings

  • de Ridder, S. and B. Biondi (2014). Continuous reservoir-scale passive monitoring using microseism noise: SEG/AGU Summer Research Workshop, Vancouver, Canada, 22-24 July.
  • de Ridder, S. and B. Biondi (2012). Continuous passive seismic monitoring of CCS projects by correlating seismic noise; a feasibility study: 74th Conference & Technical Exbition, EAGE, Extended Abstracts, 2012.
  • Dellinger, J., J. Yu and S. de Ridder, (2010). Virtual-source interferometry of 4C OBC data at Valhall without a low-cut recording filter: SEG low-frequency workshop, Snowbird, Utah abstract.
  • de Ridder, S. and B. Biondi (2010). Low frequency passive seismic interferometry for land data, 80th Annual Meeting SEG, Denver, USA, Expanded Abstracts 29, 4041-4046.
  • de Ridder, S., G. Papanicolaou, B. Biondi, (2009). Kinematics of iterative interferometry in a passive seismic experiment, 79th Annual Meeting SEG, Houston, USA, Expanded Abstracts 28, 1622-1626.

Seismoelectric Modeling and Interferometric Green's Function Recovery

Interferometric Green's function representations can be used to retrieve a Green's function between two receiver stations, effectively turning one receiver into a source. Through reciprocity theorems of the convolution and correlation types, I derived interferometric Green's function representations for coupled electromagnetic and seismic wave propagation in 1D. These representations express a symmetrized Green's function in terms of correlations of sources distributed throughout the domain of reciprocity and on its boundary.

The main challenge for practical implementation is the necessity of sources throughout a domain. Numerical examples show how this constraint can be relaxed for different configurations. In a configuration of two layers bounded by a vacuum, seismic noise sources behind the interface can be used to recover seismoelectric reflection responses that suffer from small amplitude losses, but are not corrupted by spurious events.


  • Schoemaker, F. C., N. Grobbe, M. D. Schakel, S. A. L. de Ridder, E. C. Slob, and D. M. J. Smeulders (2012). Experimental Validation of the Electrokinetic Theory and Development of Seismoelectric Interferometry by Cross-Correlation, International Journal of Geophysics, Vol. 2012, Article ID 514242, 23 pages.
  • de Ridder, S.A.L., E. Slob, K. Wapenaar, (2009). Interferometric seismoelectric Green's function representations, Geophys. J. Int., Vol. 178, issue 3, 1289-1304.
  • de Ridder, S.A.L., (2007). Simulation of Interferometric Seismoelectric Green's Function Recovery; for the SH-TE propagation mode. M.Sc. thesis, Delft University of Technology, Delft, The Netherlands, 146 pages, AES/TG/07-27.

Conference Proceeding

  • Grobbe, N., F.C. Schoemaker, M.D. Schakel, S.A.L. de Ridder, E.C. Slob, D.M.J. Smeulders (2012). Electrokinetic Fields and Waves: Theory, Experiments and Numerical Modeling: Geophysical Research Abstracts Vol. 14, EGU2012-10636.
  • Wapenaar, K., E. C. Slob, R. Snieder, D. Draganov, J. W. Thorbecke, J. van der Neut and S. de Ridder, (2007). Unified Green's function representation for interferometry, Expanded Abstracts, 69th EAGE annual meeting, London, England, B031.

Green's Function Retrieval by Coda Wave Cross-Correlations

Seismic coda are the chaotic arrivals of energy that follow after the first break of seismic waves. They result from complex subsurface structure that cause a long string of reverberation after the balistic wave passes. The coda waves cary information about the earth, but it is more difficult to image than the information in balistic waves. The angular distribution of energy flow in the coda is much more varied than in baslistic waves. This can be utilized with cross-correlations.

A unique dataset of the coda of an event the size of a small earthquake recorded with high spatial resolution is the Non Proliferation Experiment (NPE) recording made by Sam Allen and the Subsurface Exploration Company of Pasadena, CA.


  • de Ridder, S., B. Biondi, G. Papanicolaou, (2009). Green's function retrieval by iterated correlations, Workshop: 'Interferometry, the evolution of a multidisciplinary field', 79th Annual Meeting SEG, Houston, USA, II-B8.
  • de Ridder, S. (2009). Green's function retrieval by iterated coda correlations, Eos, Trans. AGU, 90(52), Fall Meet. Suppl., Abstract S21A-1699.
  • de Ridder, S., and G.A. Prieto, (2008). Seismic Interferometry and the Spatial Auto-Correlation Method on the Regional Coda of the Non-Proliferation Experiment, Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract S31A-1885. Poster

Further Reading
What Jon Claerbout has to say about this dataset.
About the Comprehensive Nuclear Test Ban Treaty (CTBT).

Near Surface Geophysics

I have an interest in near surface seismic imaging. It got me involved in an attempt to image an actively burning coal fire just 15 meters deep.
Left figure: Airplane to bring the team and equipment to the field site in Utah. Right figure: Me creating a shot record. sageep_figure.jpg Figure: Two shot records at the Southern Ute Nation Coal Fire Site; a direct P-wave event is annotated '1', two refracted events (possibly of the burning coal seam) are annotated '2' and '3', possible reflected events are annotated 'R1' and 'R2', and dispersive ground roll is annotated 'G'.

Proceedings and Publications

  • de Ridder, S., N. Crook, S.S. Haines and S. Taku Ide (2010). Seismic Investigation of Underground Coal Fires; A Feasibility Study at the Southern Ute Nation Coal Fire Site, Durango, Colorado, Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2(1), 630-638.
research.txt · Last modified: 2018/02/17 19:20 by sjoerd
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