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Nishitsuji, Y. (author), Ruigrok, Elmer (author), Draganov, D.S. (author)The characterization of the megaregolith on the Moon has been investigated in various ways including analysis of lunar meteorites, remote sensing of mineralogy and gravity, and deriving a seismic velocity profile. In this study, we propose a method for analyzing azimuthal anisotropy of the megaregolith. We call this method deep-moonquake...journal article 2020
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van IJsseldijk, J.E. (author), Ruigrok, Elmer (author), Verdel, Arie (author), Weemstra, C. (author)Global phases, viz. seismic phases that travel through the Earth?s core, can be used to locally image the crust by means of seismic interferometry. This method is known as Global Phase Seismic Interferometry (GloPSI). Traditionally, GloPSI retrieves low-frequency information (up to 1 Hz). Recent studies, however, suggest that there is high...journal article 2019
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Casas, J. A. (author), Draganov, D.S. (author), Badi, G. A. (author), Manassero, M. C. (author), Olivera Craig, V. H. (author), Franco Marín, L. (author), Gómez, M. (author), Ruigrok, E. (author)Although the Planchón-Peteroa Volcanic Complex (PPVC) has undergone many hazardous eruptions, only a small number of geological, geochemical, and geophysical studies have been performed to describe this active volcanic system. In order to characterize the subsurface structures present at the PPVC, we applied seismic interferometry to fracture...journal article 2019
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Martins, Joana E. (author), Ruigrok, Elmer (author), Draganov, D.S. (author), Hooper, A. (author), Hanssen, R.F. (author), White, R.S. (author), Soosalu, Heidi (author)Torfajökull volcano, Iceland, has not erupted since 1477. However, intense geothermal activity, deformation, and seismicity suggest a long‐lasting magmatic system. In this paper, we use ambient noise tomography to image the magmatic system beneath Torfajökull volcano. One hundred days of ambient noise data from 23 broadband seismometers show the...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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Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, E.N. (author), Hunziker, J.W. (author), Gomez, Martin (author), Wapenaar, C.P.A. (author)Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, the SI responses are retrieved by simple crosscorrelation of recordings made by separate receivers: one of the receivers acts as a ‘virtual source’ whose response is retrieved at the other receivers.When SI is applied...journal article 2017
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Ruigrok, E.N. (author), Gibbons, Steven (author), Wapenaar, C.P.A. (author)An areal distribution of sensors can be used for estimating the direction of incoming waves through beamforming. Beamforming may be implemented as a phase-shifting and stacking of data recorded on the different sensors (i.e., conventional beamforming). Alternatively, beamforming can be applied to cross-correlations between the waveforms on...journal article 2017
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Nishitsuji, Y. (author), Ruigrok, E (author), Gomez, M (author), Wapenaar, C.P.A. (author), Draganov, D.S. (author)Obtaining detailed images of aseismic parts of subducting slabs remains a large challenge for understanding slab dynamics. Hypocenter mapping cannot be used for the purpose due to the absence of seismicity, whereas the use of receiver functions might be compromised by the presence of melt. Global tomography can be used to identify the presence...journal article 2016
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Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, Elmer (author), Huniziker, Jürg (author), Gomez, Martin (author), Wapenaar, C.P.A. (author)Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, these seismic interferometric responses are retrieved by simple crosscorrelation of recordings made by separate receivers: a first receiver acts as a 'virtual source' whose response is retrieved at the other receivers...abstract 2016
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Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, E.N. (author), Wapenaar, C.P.A. (author), Gomez, M. (author)Generating new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventially, the new responses are retrieved by simple crosscorrelation of recordings made by separate receivers: a first receiver acts as `virtual source' whose response is retrieved at the other receivers. The newly retrieved...abstract 2016
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Casas, Augusto (author), Draganov, D.S. (author), Olivera Craig, Victoria Hipatia (author), Manassero, Maria Constanza (author), Badi, Gabriela (author), Franco, Luis (author), Ruigrok, E.N. (author), Gomez, Martin (author)Seismic interferometry (SI) retrieves virtual seismic signals from measurements at two receivers from surrounding sources. Studies have demonstrated that SI can image subsurface reflectivity. Claerbout (1968) showed that the reflection response can be obtained by autocorrelating the transmission response assuming a 1-D acoustic medium. Migration...abstract 2016
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Casas, Augusto (author), Draganov, D.S. (author), Olivera Craig, Victoria Hipatia (author), Manassero, Maria Constanza (author), Badi, Gabriela (author), Franco, L (author), Gomez, Martin (author), Ruigrok, E.N. (author)Seismic interferometry (SI) studies the interference phenomenon between pairs of signals in order to obtain information from the differences between them. SI is now regularly used in exploration and global seismology with active and/or passive sources, i.e., artificial sources (dynamite, vibroseis, sledge hammer, etc.) or natural sources ...abstract 2016
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Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, E.N. (author), Hunziker, J.W. (author), gomez, Martin (author), Wapenaar, C.P.A. (author)Obtaining new seismic responses from existing recordings is generally referred to as seismic interferometry (SI). Conventionally, these seismic interferometric responses are retrieved by simple crosscorrelation of recordings made<br/>by separate receivers: a first receiver acts as a 'virtual source' whose response is retrieved at the other...abstract 2016
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- Nishitsuji, Y. (author), Draganov, D.S. (author), Ruigrok, E. (author), Gomez, M. (author), Wapenaar, C.P.A. (author) conference paper 2015
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Nishitsuji, Y. (author), Ruigrok, E. (author), Gomez, M. (author), Draganov, D.S. (author)We investigated the applicability of global phases (epicentral distances of ? 120° and ? 150°) for the H/V spectral ratio to identify the fundamental resonance frequency. We applied the method to delineate a part of Neuquén basin in Argentina without the need for active seismic sources. We obtained fairly identifiable fundamental resonance...conference paper 2015
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Van Dalen, K.N. (author), Mikesell, T.D. (author), Ruigrok, E.N. (author), Wapenaar, C.P.A. (author)Retrieving virtual source surface waves from ambient seismic noise by cross correlation assumes, among others, that the noise field is equipartitioned and the medium is lossless. Violation of these assumptions reduces the accuracy of the retrieved waves. A point-spread function computed from the same ambient noise quantifies the associated...journal article 2015
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- Weemstra, C. (author), Draganov, D.S. (author), Ruigrok, E.N. (author) abstract 2015
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Draganov, D.S. (author), Ruigrok, E.N. (author), Ghose, R. (author), Mikesell, D. (author), Van Wijk, K. (author)We propose a method for estimating the reflection coefficient of a subvertical boundary and the the quality factor of the medium between a receiver and the subvertical boundary. The method uses surface waves from transient deterministic sources and is inspired by the occurrence of non-physical arrivals in seismic-interferometry results due to...conference paper 2014
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Nishitsuji, Y. (author), Ruigrok, E.N. (author), Gomez, M. (author), Draganov, D.S. (author)Structural estimation of unconsolidated sediments and basins is of fundamental importance for resources exploration, geohazard assessments, and other geophysical aspects. The estimation contributes not only to the understanding of the tectonic settings, but also to the choice of parameters for possible further seismic processing, for example,...journal article 2014
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Frank, J.G. (author), Ruigrok, E.N. (author), Wapenaar, C.P.A. (author)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...journal article 2014
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