نتایج جستجو برای: x domain seismic gathers

تعداد نتایج: 1043226  

2005
Stig-Kyrre Foss Maarten V. de Hoop Bjørn Ursin

S U M M A R Y In this paper we derive 2.5-D short-period seismic modelling and imaging-inversion formulae in the Born approximation for anisotropic elastic media. The 2.5-D approach encompasses 3-D wave scattering measured in a common-azimuth acquisition geometry subject to 2-D computations under appropriate assumptions. The lowest possible symmetry of the medium in this approach, in principle,...

A. Fakhraddini H. Saffari, S. S. Seyedjafari Olia

Concentrically braced frames (CBFs) are one of the efficient lateral load resisting systems in high seismicity regions. One of the common problems with the use of concentrically braced frames is limitation in the architectural application and position of the openings. Two-story X braced frames have more advantages than other configurations of concentrically braced frames, since in many cases th...

Journal: :فیزیک زمین و فضا 0
سمیرا محمدی کارشناس ارشد ژئوفیزیک (لرزه شناسی)، دانشگاه آزاد اسلامی واحد ساوه، ایران حمیدرضا سیاه کوهی دانشیار، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران

obtaining a seismic section with high temporal and spatial resolution was always one of the goals of seismic data processors and interpreters. accurate estimation of the thicknesses of thin beds is an important tool in this regard. the basic problem is that the wavelength of the signal must be similar in dimention to that of the bed thinness. if it is much longer than the bed thinness, the dete...

Random or incoherent noise is an important type of seismic noise, which can seriously affect the quality of the data. Therefore, decreasing the level of this category of noises is necessary for increasing the signal-to-noise ratio (SNR) of seismic records. Random noises and other events overlap each other in time domain, which makes it difficult to attenuate them from seismic records. In this r...

2008
Sarat Kumar Das Pijush Samui

ABSTRACT: Frequent occurrence of seismic activities has drawn attention of various researchers, cutting across science and engineering discipline. The domain of earthquake geotechnical engineering has extended from determination of attenuation of seismic wave to providing suitable foundation under liquefied and unliquefied soil conditions. The seismic data can be fully intrepreated by use of se...

2010
Paul Sava Huub Douma

Wave-equation, finite-frequency imaging and inversion still face many challenges in addressing the inversion of highly complex velocity models as well as in dealing with nonlinear imaging e.g., migration of multiples, amplitude-preserving migration . Extended images EIs are particularly important for designing image-domain objective functions aimed at addressing standing issues in seismic imagi...

1999
Jiří NÁPRSTEK Cyril FISCHER

Seismic random processes are characterized by high non-stationarity and, in most cases, by a marked variability of frequency content. The hypothesis modelling seismic signal as a simple product of a stationary signal and a deterministic modulation function, consequently, is hardly ever applicable. Several mathematical models aimed at expressing the recorded process by means of a system of stati...

2008
António Teixeira Daniela Braga Luís Caldas Luís Miguel Cabral Diana Santos Luís Fernando Costa

SUPeRB is a digital library helper that aims at updating and maintaining specific publication repositories, and assisting in the publishing of publication records, for institutions and individual actors. It gathers bibliographic data from Web pages and documents and integrates that data into a local repository of bibliographic data on a specific domain. By collecting information from these reso...

2009
Yaofeng He

Sensitivity kernels for wave equation based migration velocity analysis in local angle-domain are formulated. These sensitivity kernels serve as operators to backproject the residual moveout in local angle-domain common image gathers to migration models for velocity updating. To validate the theoretical formulation, we directly measure sensitivity kernels using a perturb-measuring approach. For...

2012
ZHAOHUI GUO MAARTEN V. DE HOOP

Abstract. We present a variational framework for shape optimization and shape reconstruction problems in seismic domains based full waveform inversion. We discuss general shape functionals in this framework, along with applications to shape optimization using the Helmholtz equation and image domain segmentation. We study the shape derivative in each case to express the variation of energy with ...

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