Shear wave statics using receiver functions

Manen, Dirk‐Jan van; Robertsson, Johan O. A.; Curtis, Andrew; Ferber, Ralf; Paulssen, Hanneke

doi:10.1046/j.1365-246x.2003.01945.x

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…This study, together with the previous work by Morozov & Smithson (2002) and van Manen et al (2003) demonstrate that RF methodology can be used to extract useful information and improve the resolution of both crustal and mantle wide‐angle and multicomponent reflection data sets used in the oil exploration industry. The two types of data sets (Peaceful Nuclear Explosions and wide‐angle crustal) provide a nearly continuous coverage of the source–receiver offset ranges from teleseismic to near regional.…”

Section: Discussionmentioning

confidence: 59%

“…Morozov & Dueker 2003) could be used to map the shallow structures which are currently not beyond the imaging range, such as the low‐velocity weathering layer. Utilization of converted waves also appears to be the only feasible approach for accurate mapping of S ‐wave statics (van Manen et al 2003), which is currently one of the major stumbling blocks in S wave and multicomponent seismic processing and inversion (Tatham & McCormack 1991). Finally, the use of dense and high‐quality controlled‐source data sets also allows testing, calibration and improvement of RF methodology.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, similarly to teleseismic seismology, PNE RFs could successfully be utilized to map the thickness of the sediments along the profile by using only several sparsely spaced sources. On the opposite end of the range and depth spectrum of controlled‐source seismology, van Manen et al (2003) showed that RF stacks can be used to constrain the structure of the shallow subsurface and measure the S ‐wave statics in commercial four‐component marine reflection data sets.…”

Section: Introductionmentioning

confidence: 99%

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Use of receiver functions in wide-angle controlled-source crustal data sets

Morozov

Din

2008

Geophysical Journal International

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S U M M A R YFirst-arrival waveforms remain underutilized in crustal refraction-reflection seismology by mostly reducing them to traveltime picks. However, as in earthquake seismology, the waveforms also contain important information about shallow near-receiver structures. We illustrate the use of three-component waveform analysis on the records from the ACCRETE wide-angle data set (SE Alaska and British Columbia; 1994), apply the Receiver Function (RF) methodology to the codas of P-wave arrivals, and draw two important conclusions. First, the P-wave polarization azimuths are found to be controlled by the near-receiver structures and virtually unrelated to the source-receiver backazimuths, from which they deviate by up to ∼40• . This observation might be important for studies of anisotropy and also for earthquake RF studies. Second, after correcting for the polarization azimuths, clear P/S mode conversions are reliably detected within 80-400 ms following the primary arrivals. The conversions are interpreted as originating at the base of the sedimentary cover of the fjord channel. In most cases, imaging of the basement requires only several records; however, notable exceptions are also found and interpreted as caused by multipathing, localized scattering, and onsets of crustal and Moho reflections. The ACCRETE example shows that RF methodology could be useful for constraining sediment thickness and deriving P-and S-wave receiver statics in land refraction surveys where collocated reflection profiles are not available. In addition, RFs from repeatable controlled sources could be useful for testing and calibration of RF techniques.Key words: Controlled source seismology; Site effects; Wave scattering and diffraction; Crustal structure; North America. I N T RO D U C T I O NWide-angle refraction-reflection crustal seismic experiments are designed to investigate the velocity and reflectivity structures of the deep crust and uppermost mantle. Use of powerful sources and long and dense multicomponent receiver lines allows imaging of the crustal structures located at great depths. However, shallow crustal structures, and particularly the low-velocity weathered zone and sedimentary cover remain underconstrained in these investigations. In part, this is due to the prevalent mode of wide-angle data analysis and interpretation, which are mostly based on traveltime picking, modelling, and tomography. Even pre-stack Kirchhoff depth migration represents an essentially traveltime based imaging procedure whose success is strongly dependent on the knowledge of the shallow velocity structure. In order to reveal subtle details of the nearreceiver structure, one needs to move from predominantly traveltime interpretations to the analysis of three-component waveforms. This paper is an attempt of such a study using the Receiver Function (RF) methodology.P/S mode conversions following the first arrivals can provide valuable information about the S-wave velocity contrasts within the shallow subsurface. In teleseismic seismology, deconvolu...

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of receiver functions in wide-angle controlled-source crustal data sets

Morozov

Din

2008

Geophysical Journal International

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“…Several methods have been proposed to estimate the S-wave velocity structure of the seabed region or associated static corrections, including the use of Scholte waves at the seabed (Muyzert 2000) and receiver function techniques (van Manen et al 2002). Here, we demonstrate the potential for 2D elastic waveform inversion for the solution of static problems and identification of drilling hazards, through quantification of both P-and S-wave velocities in the sub-seabed region for a low velocity model.…”

Section: Low Velocity Lens: Shear-wave Static Problemmentioning

confidence: 94%

“…Several methods have been proposed to estimate the S‐wave velocity structure of the seabed region or associated static corrections, including the use of Scholte waves at the seabed (Muyzert 2000) and receiver function techniques (van Manen et al . 2002).…”

Section: D Synthetic Examplesmentioning

confidence: 99%

Elastic full waveform inversion of multi‐component OBC seismic data

Sears

Singh²,

Barton

2008

Geophysical Prospecting

125

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A B S T R A C TElastic full waveform inversion of seismic reflection data represents a data-driven form of analysis leading to quantification of sub-surface parameters in depth. In previous studies attention has been given to P-wave data recorded in the marine environment, using either acoustic or elastic inversion schemes. In this paper we exploit both P-waves and mode-converted S-waves in the marine environment in the inversion for both P-and S-wave velocities by using wide-angle, multi-component, ocean-bottom cable seismic data. An elastic waveform inversion scheme operating in the time domain was used, allowing accurate modelling of the full wavefield, including the elastic amplitude variation with offset response of reflected arrivals and mode-converted events. A series of one-and two-dimensional synthetic examples are presented, demonstrating the ability to invert for and thereby to quantify both P-and S-wave velocities for different velocity models. In particular, for more realistic low velocity models, including a typically soft seabed, an effective strategy for inversion is proposed to exploit both P-and mode-converted PS-waves. Whilst P-wave events are exploited for inversion for P-wave velocity, examples show the contribution of both P-and PS-waves to the successful recovery of S-wave velocity. I N T R O D U C T I O NFor the characterization of both a hydrocarbon reservoir and its overlying geology, a depth model quantifying the elastic parameters is a more desirable product than a qualitative stacked image of reflectivity in time. Variation in depth rather than time is more meaningful to geologists and drilling engineers alike, whilst elastic parameter quantification can be used to deduce the lithology, fluid content and pore pressure of rocks (e.g., Tatham and Stoffa 1976).Full waveform inversion, in which the aim is to find the true Earth model from an observed seismic dataset, provides an alternative approach to stack based processing for the analysis of seismic reflection data. Using iterative optimization methods, inversion aims to recover the true model by relating the differences in synthetic and observed data to appropriate model updates. Whilst tomographic inversions (e.g., Zelt and Smith 1992;Hobro, Singh and Minshull (2003)) use picked * Now at: BG Group, 100 Thames Valley Park, Reading, RG6 1PT, UK travel-time data alone, full waveform inversion in the manner of Tarantola (1986) and Mora (1987) offers a more complete approach, exploiting both traveltime and waveform attributes such as amplitude, phase and frequency content. The full two-way elastic wave equation must be solved through methods such as finite-differences, allowing calculation of required traveltime and waveform information for all events within the wavefield. Though computationally intense, full waveform inversion is sensitive to elastic parameters of the Earth at shorter wavelengths than traveltime inversion which is restricted by the high frequency approximation. Moreover, waveform inversion is largely data driven, without...

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Receiver Functions with Artificial Sources

Morozov

Gao

2016

Encyclopedia of Earthquake Engineering

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Shear wave statics using receiver functions

Cited by 6 publications

References 14 publications

Use of receiver functions in wide-angle controlled-source crustal data sets

Use of receiver functions in wide-angle controlled-source crustal data sets

Elastic full waveform inversion of multi‐component OBC seismic data

Receiver Functions with Artificial Sources

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