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PSSP methods

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Journal Article
Journal: Geophysics
Published: 01 January 1992
Geophysics (1992) 57 (1): 161–170.
...Norman W. Kim; A. J. Seriff Abstract Marine shear-wave reflection methods using the conventional data acquisition system (i.e., source and receiver in water) rely on two mode conversions at the water bottom to produce shear reflections such as PSSP. Some theoretical considerations and the results...
Journal Article
Journal: Geophysics
Published: 12 November 2021
Geophysics (2022) 87 (1): T15–T28.
... no. 309960 The purpose of this paper is to develop a simple formalism that allows the acoustic wave propagator matrix modeling method to be adapted to model pseudoelastic PP arrivals and PSSP arrivals and primary P arrivals for a plane stratified elastic earth. When the stratified geology has...
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Journal Article
Journal: Geophysics
Published: 01 June 1982
Geophysics (1982) 47 (6): 869–883.
... be identified. To exploit such separation and identification, a method is developed to decompose the CDP-gathered data into several phases. The method combines normal moveout (NMO) removal, space-time filtering, and NMO restoration. The space-time operator central to this method is shown to have several useful...
Journal Article
Journal: Geophysics
Published: 12 March 2010
Geophysics (2010) 75 (2): T15–T21.
..., the simple method of modifying the velocity model to properly migrate the PSSP event effectively shows how such an event constructively contributes to the image and suggests that migration of other multiples or multimode events would be beneficial. Although the method is not a practical imaging algorithm...
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Journal Article
Journal: Geophysics
Published: 24 December 2021
Geophysics (2022) 87 (1): 1JF–4JF.
... corresponding to different physical processes. For an elastic medium bounded above by an acoustic half-space, Amundsen and Ursin show how the acoustic wave propagator matrix modeling method can be modified to model pseudoelastic PP arrivals and PSSP arrivals. PP arrivals propagate as pure longitudinal (P...
Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (3): 1052–1059.
... salt base from the multiples. The P-wave illumination is sometimes inadequate for imaging the BOS of salt domes. We use 3D poststack and prestack depth-migrated examples to show that converted waves can image the BOS for velocity model building. In this paper we propose three methods...
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Journal Article
Journal: Geophysics
Published: 21 December 2011
Geophysics (2011) 76 (6): V105–V114.
... and interpretation ( Weglein, 1999 ). Much previous work has been done to attenuate free-surface multiples in acoustic data including the SRME method ( Verschuur, 1991 ; Verschuur et al., 1992 ; Verschuur and Berkhout, 1997 ; Biersteker, 2001 ; Van Dedem, 2002 ). SRME has proved to be effective for acoustic...
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Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (1): 35–45.
... for systematic variations upon the depth model provided insight into how each part of the model affected the synthetic. This led to the identification of parameters in the depth model that have only a minor influence upon the synthetic and suggested methods for estimating the parameters that are important...
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Journal Article
Journal: The Leading Edge
Published: 01 December 2021
The Leading Edge (2021) 40 (12): 905–913.
... — and show our approach to attenuate them to reveal the true structures. The second part focuses on advanced identification of interbed multiples in modeling and migration methods. To facilitate the various strategies to attenuate interbed multiples, “interpretation” of the various events plays a significant...
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Journal Article
Journal: Geology
Published: 26 July 2021
Geology (2021) 49 (11): 1375–1380.
... craton so that their ca. 2.0 Ga poles align. As such, magmatism forms part of a radiating pattern with the coeval ca. 1.88 Ga Circum-Superior large igneous province. We sampled 61 dikes for paleomagnetic study using standard methods (see the Supplemental Material; Table S3). Directly dated dikes were...
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Journal Article
Published: 01 October 2022
Russ. Geol. Geophys. (2022) 63 (10): 1177–1188.
... of the reflection coefficient amplitude of a homogeneous thin layer using the spectral decomposition technology allows us to isolate only the change in the reflection coefficients, regardless of the thickness. The proposed method for predicting the elastic properties of thin beds is based on the analytical...
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Journal Article
Journal: Interpretation
Published: 08 September 2014
Interpretation (2014) 2 (4): SL1–SL20.
... are specific to the model being used: If the model is significantly in error, then the conclusions may be misleading. In addition, using ray-based methods often gives poor results in complex areas because ray theory assumes that interfaces are smooth on a scale length comparable with the wavelength...
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Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (1): 308–313.
... with piezoelectric transducers. Here, we describe a new technology for physical modeling which relies on the use of transient electromagnetic impulses, rather than acoustic impulses, for the study of model systems. This method is based on terahertz (THz) time-domain spectroscopy (THz-TDS), a relatively new...
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Journal Article
Journal: Geophysics
Published: 30 September 2020
Geophysics (2020) 85 (5): T293–T308.
... S . Furthermore, since seismic wave simulations usually employ explicit time stepping methods, the time step lengths are usually dictated by the Courant-Friedrichs-Lewy stability condition. In short, we have Δ t E ∝ Δ x E c P and Δ t A ∝ Δ x A c P , (4...
Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (4): 1272–1280.
... aggregates used in the subsequent seismic modeling are shown in Table 1 . For a given wave-front normal and a set of elastic constants, the group velocity can be calculated using standard methods ( Kendall and Thomson, 1989 ). Calculation of velocities over a range of normals defines the anisotropic...
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Journal Article
Journal: Geophysics
Published: 21 March 2024
Geophysics (2024) 89 (3): S175–S194.
... al., 2017 ; Lu et al., 2020 ; Gu et al., 2021 ). In marine seismic exploration, the prevalent and cost-effective method is towed-streamer seismic data acquisition. These data capture P waves that are converted from subseabed S waves, even though it records only scalar pressure ( Allouche et al...
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Journal Article
Published: 01 February 1968
Bulletin of the Seismological Society of America (1968) 58 (1): 179–214.
...Donald V. Helmberger abstract A plane layered oceanic crustal model is investigated. A point source and receiver are located in the oceanic fluid layer. The Mohorovic˘ić discontinuity is treated as a layered transition zone. De Hoop's modification of Cagniard's method is used to obtain the exact...
Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (1): 40–57.
... with analysis to unravel the various wave types, is providing some remarkable new images. The converted-wave (P-S) method uses P energy propagating downward, converting upon reflection to an upcoming S-wave. P-S analysis can provide improved subsurface images as well as give a measure of S-wave properties...
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Journal Article
Journal: Geophysics
Published: 28 January 2022
Geophysics (2022) 87 (2): R231–R244.
...Lasse Amundsen; Bjørn Ursin ABSTRACT An amplitude variation with angle (AVA) inversion method is presented for estimating density and velocities of a stratified elastic medium from reflection seismograms in the intercept time-horizontal slowness domain. The elastic medium parameters are assumed...
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Series: EAGE Education Tour Series
Publisher: EAGE
Published: 01 January 2018
DOI: 10.3997/book9789462822535_ch_003
EISBN: 9789462822535
... contrast layers. When we have significant S-to-P mode conversion of the upcoming wavefield at the seabed, we can record converted mode (PSSP, PSPP, PPSP) seismic arrivals: this will happen for shallow water (as we had in this study) even for modest source-receiver offsets. During conventional processing...
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