Migration by Extrapolation of Time‐dependent Boundary Values*

McMechan, George A.

doi:10.1111/j.1365-2478.1983.tb01060.x

Cited by 754 publications

(261 citation statements)

References 10 publications

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“…As an example, Lerosey et al (3) demonstrated that subwavelength (that is, super-resolution) imaging of the source location could be achieved by refocusing scattered microwave energy from near-field scatterers. They denoted this refocusing operation as a timereversal mirror (4,5), which is similar to reverse time migration by exploration geophysicists (6)(7)(8) except that no velocity model is required because the Green's functions for refocusing are recorded in the data.…”

Section: Introductionmentioning

confidence: 99%

Far-field superresolution by imaging of resonant multiples

Schuster

Huang

2014

Geophysical Journal International

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We demonstrate for the first time that seismic resonant multiples, usually considered as noise, can be used for super-resolution imaging in the far-field region of sources and receivers. Tests with both synthetic data and field data show that resonant multiples can image reflector boundaries with resolutions more than twice the classical resolution limit. Resolution increases with the order of the resonant multiples. This procedure has important applications in earthquake and exploration seismology, radar, sonar, LIDAR (light detection and ranging), and ultrasound imaging, where the multiples can be used to make high-resolution images.

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Section: Introductionmentioning

confidence: 99%

Far-field superresolution by imaging of resonant multiples

Schuster

Huang

2014

Geophysical Journal International

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“…The TRI technique in seismology has been used in source location and identification of source mechanisms (Gajewski and Tessmer 2005;Larmat et al 2006Larmat et al , 2010Kawakatsu and Montagner 2008;Steiner and Saenger 2010;Artman et al 2010;Debski 2015). In seismic exploration the TRI technique has been applied to wave field migration (Baysal et al 1983;McMechan 1983;Tarantola 1988;Fichtner et al 2006) and structure imaging in complex geological conditions like salt domes (Willis et al 2006). Most of these projects exploited TRI for an assumed single point source location.…”

Section: Introductionmentioning

confidence: 99%

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

2017

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The time reversal method has become a standard technique for the location of seismic sources. It has been used both for acoustic and elastic numerical modelling and for 2D and 3D propagation models. Although there are many studies concerning its application to point sources, little so far has been done to generalise the time reversal method to the study of sequences of seismic events. The need to describe such processes better motivates the analysis presented in this paper. The synthetic time reversal imaging experiments presented in this work were conducted for sources with the same origin time as well as for the sources with a slight delay in origin time. For efficient visualisation of the seismic wave propagation and interference, a new coefficient-peak average power ratiowas introduced. The paper also presents a comparison of visualisation based on the proposed coefficient against a commonly used visualisation based on a maximum value.

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“…Seismic wavefield modeling is a key component of seismic imaging, e.g., reverse-time migration [3,27,33,49,50,52,53,60], and inversion, e.g., full-waveform inversion [36,37,43,48]. Due to the heterogeneity of the Earth, the simulation of seismic wavefields is achieved most commonly using numerical methods, such as the finite-element method [8,30,35], the finite-difference method [1,25,44,45], spectral-element method [23,24], or discontinuous Galerkin [6,7,11,15,21].…”

Section: Introductionmentioning

confidence: 99%

Accurate seabed modeling using finite difference methods

et al. 2017

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Finite difference is the most widely used method for seismic wavefield modeling. However, most finitedifference implementations discretize the Earth model over a fixed grid interval. This can lead to irregular model geometries being represented by 'staircase' discretization, and potentially causes mispositioning of interfaces within the media. This misrepresentation is a major disadvantage to finite difference methods, especially if there exist strong and sharp contrasts in the physical properties along an interface. The discretization of undulated seabed bathymetry is a common example of such misrepresentation of the physical properties in finite-difference grids, as the seabed is often a particularly sharp interface owing to the rapid and considerable change in material properties between fluid seawater and solid rock. There are two issues typically involved with seabed modeling using finite difference methods: firstly, the travel times of reflections from the seabed are inaccurate as a consequence of its spatial mispositioning; secondly, artificial diffractions are generated by the staircase representation of dipping seabed bathymetry. In this paper, we propose a new method that provides a solution to these two issues by positioning sharp interfaces at fractional grid locations. To achieve this, the velocity The Unconventional Natural Gas Institute, China University of Petroleum (Beijing), Beijing 102249, China model is first sampled in a model grid that allows the center of the seabed to be positioned at grid points, before being interpolated vertically onto a regular modeling grid using the windowed sinc function. This procedure allows undulated seabed bathymetry to be represented with improved accuracy during modeling. Numerical tests demonstrate that this method generates reflections with accurate travel times and effectively suppresses artificial diffractions.

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Migration by Extrapolation of Time‐dependent Boundary Values*

Cited by 754 publications

References 10 publications

Far-field superresolution by imaging of resonant multiples

Far-field superresolution by imaging of resonant multiples

Time reversal seismic source imaging using peak average power ratio (PAPR) parameter

Accurate seabed modeling using finite difference methods

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