Vector Fidelity Analyses of Seabed Seismic Data

Woje, Geir; Berg, Eivind; Rykkelid, J.I.; Svendsen, Ø.; Aanensen, O.

doi:10.3997/2214-4609-pdb.5.e003

Cited by 5 publications

(10 citation statements)

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“…However, on consolidated sandy sediment it might be sufficient to lay down the receiver system directly on the seafloor. Fjellanger et al (2002) and Woje et al (2002) point out that cable-based receiver systems cannot respond uniformly on both horizontal receiver components due to different coupling. They concluded that gravitationally coupled vertical receivers are a compromise between the seafloor and the receiver interaction and the weight of the receiver system.…”

Section: Discussionmentioning

confidence: 99%

“…However, cable-based receiver systems show different receiver coupling response between the inline and cross-line receiver components (e.g. Woje et al 2002;Dellinger and Clarke 2004; due to the long contact area between the cable and the seafloor.…”

Section: Discussionmentioning

confidence: 99%

“…There are some data-driven approaches, such as discussed in Bagaini et al (2000) and Gaiser (2003). But there are some unsolved contradictions as shown in Verti et al (2002), where fast S-waves correlated well with borehole data and the opposite measurement results are presented in Woje et al (2002).…”

Section: Shear-wave Couplingmentioning

confidence: 99%

“…Many authors, such as Woje et al (2002), Norris et al (2006) and Gaiser (2007), have performed tests on cable-based receiver systems with different results. Besides the trenched/untrenched discussion, Woje et al (2002) and Dellinger and Clarke (2004) presented some evidence that the cable itself may cause problems with respect to azimuthdependent sensitivity. With increased focus on azimuthal anisotropy, S-wave birefringence and amplitude variation with azimuth the azimuthal-dependent sensitivity becomes important.…”

Section: Cable-based System Couplingmentioning

confidence: 99%

“…They suggested an unconsolidated seafloor layer with high water content as source for horizontal coupling differences. For cable‐based systems, Woje, Berg and Rykkelid () suggested that receiver systems are not qualified to acquire S‐waves at all azimuths.…”

Section: Theorymentioning

confidence: 99%

See 4 more Smart Citations

Seismic receiver coupling to the seafloor

Landschulze¹

2019

Geophysical Prospecting

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The presence of geophysical receivers on the seafloor changes the local wave field due to the receiver seafloor interaction. The resulting PP‐ and PS‐wave distortion of the wave field is often referred to as receiver coupling to the seafloor and can make data processing challenging and sometimes impossible. This paper provides an overview of the mathematical approaches to describe receiver coupling, how to estimate receiver coupling and what the difficulties and possible solutions are. The first section shows how the mathematical approach developed from a simple model considering only the vertical receiver component to include all three receiver components and their interactions with the seafloor. In the second section, I show how receiver coupling can be measured and how it can be improved using mathematical and data‐driven approaches.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Shear-wave Couplingmentioning

confidence: 99%

Section: Cable-based System Couplingmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Seismic receiver coupling to the seafloor

Landschulze¹

2019

Geophysical Prospecting

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Recent developments in seismic seabed oil reservoir monitoring applications using fibre-optic sensing networks

Freitas¹

2011

Meas. Sci. Technol.

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This review looks at recent developments in seismic seabed oil reservoir monitoring techniques using fibre-optic sensing networks. After a brief introduction covering the background and scope of the review, the following section focuses on state-of-the-art fibre-optic hydrophones and accelerometers used for seismic applications. Related metrology aspects of the sensor such as measurement of sensitivity, noise and cross-axis performance are addressed. The third section focuses on interrogation systems. Two main phase-based competing systems have emerged over the past two decades for seismic applications, with a third technique showing much promise; these have been compared in terms of general performance.

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“N”-shaped Y/X coda spectral ratio observed for in-line-type OBS networks; S-net and ETMC: interpretation based on natural vibration of pressure vessel

Sawazaki

Nakamura

2020

Earth Planets Space

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We have identified “N”-shaped Y/X amplitude spectral ratios in S-coda records from a significant number of OBSs (ocean bottom seismometers) belonging to in-line-type ocean bottom networks of S-net and ETMC deployed around the Japan Trench and Sagami Trough, respectively. The “N”-shape reflects a sharp peak and notch at approximately 5–13 Hz and 10–23 Hz, respectively. This shape does not characterize OBSs belonging to node-type ocean bottom network of DONET deployed near the Nankai Trough. For S-net stations, the “N”-shape is not clearly formed for stations installed within grooves dug in the seafloor. We interpret the “N”-shaped Y/X amplitude spectral ratio is caused by the natural vibrations of a cylindrical pressure vessel that is placed sideways (long-axis lies in the horizontal plane) on the seafloor. The notch and peak frequencies in the Y/X amplitude spectral ratio likely correspond to natural frequencies of longitudinal (X-direction) and torsional and/or bending (Y-direction) vibrations, respectively. These natural vibrations are not observed for buried OBSs or those installed within grooves in the seafloor probably because they are better coupled to the seafloor. We propose a simple model to evaluate the extent to which the peak and notch have formed, which depends on the natural frequencies and coupling of the pressure vessel. We suggest users of in-line-type OBSs carefully examine if there are different responses between the X and Y components when frequencies about > 3 Hz are used. When installing OBS networks in the future, installing OBSs and cables within grooves dug in the seafloor or by burial will be effective in suppressing such natural vibrations.

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Vector Fidelity Analyses of Seabed Seismic Data

Cited by 5 publications

References 0 publications

Seismic receiver coupling to the seafloor

Seismic receiver coupling to the seafloor

Recent developments in seismic seabed oil reservoir monitoring applications using fibre-optic sensing networks

“N”-shaped Y/X coda spectral ratio observed for in-line-type OBS networks; S-net and ETMC: interpretation based on natural vibration of pressure vessel

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