Download or read book Seismic Physical Modeling Applied in Ultrasonic Nondestructive Testing and Seismic Wave Propagation written by 曾柏諺 and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Physical Modeling written by Daniel A. Ebrom and published by SEG Books. This book was released on 1994 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than half a century, interpreters, researchers, and teachers have used physical-model data to better understand and communicate the behavior of seismic waves. Seismic interpreters faced with ambiguities in data analysis have long struggled with the dilemma of either puzzling through the real seismic data or looking at computer-generated synthetic data. Physical-model data lie at an intermediate position between those two extremes. The articles included in this book cover the entire chronology of physical modeling, from the first efforts in Japan in the late 1920s to the space-age laser-ultrasonic experiments of the 1990s. Of the 44 papers collected in this volume, more than half are from sources other than Geophysics. The applications covered in this book include interpretation of complicated subsurface structures, research into elastic and anisotropic wave phenomena, and teaching of fundamental seismic principles.
Download or read book Ultrasonic Physical Modeling of Seismic Wave Propagation from a Graben like Structure written by M. S. Vassiliou and published by . This book was released on 1986 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Physical Modeling of Seismic Wave Propagation from Graben Like Structures written by M. S. Vassiliou and published by . This book was released on 1987 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes ultrasonic experiments intended to help clarify the problem of seismic wave propagation in cases where sources are excited in a graben-like structure with significantly different material properties from those of the surrounding propagation medium. Ultrasonic waves are produced using a breaking pencil lead as a source (step unloading of the surface) and a true-displacement conical transducer as a receiver. We have made measurements by exciting the source on the half space (made of fine grained gabbro, with V sub p = 6.2 km/s) and within two graben-like structures: a cylindrical plug graben of 13 mm diameter and 2 mm depth; and a scale model (1 mm = 1 km) of Yucca Flat. In the case of cylindrical graben, the presence of a source region with significantly slower velocities than the surrounding region appears to lead to a more complex signal, with more ringing than would be apparant if there were no such region. The presence of such a source appears to result in a relative amplification of the high frequency part (200-400 KHz) of the signal. If we scale the results so that they correspond to a cylindrical basin roughly the size of Yucca Flat, this means that frequencies analogous to 3-10 s in the Earth appear to be amplified relative to lower frequencies. Experiments on the scale model of Yucca Flat yield, in general, less dramatic results. The loss of symmetry apparently leads to less opportunity for focussing, and amplifications are not as great. Waveforms do not vary as much azimuthally in character or shape as they do in the cylindrical case, nor do they vary as much with source position within the graben.
Download or read book Ultrasonic Physical Modeling of Seismic Wave Propagation from a Graben Like Structure A Preliminary Report written by M. S. Vassiliou and published by . This book was released on 1986 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic experiments help clarify the problem of seismic wave propagation in cases where sources are excited in a region with significantly different properties from those of the surrounding propagation medium. Such a case exists, for example, when nuclear explosions are detonated at Yucca Flat. Ultrasonic waves are produced using a breaking pencil lead as a source (step unloading of the surface), and a true displacement conical transducer as a receiver. Measurements are made setting the source off on the half space (made of fine grained gabbro, with Vp=6.2 km/s), and with a cylindrical graben of 13mm diameter and 2mm depth. The graben was filled with either crystal wax (Vp=2.407) or HPAL3 (an aluminum filled resin with Vp=3.287). Rayleigh waves for frequency 100 KHz in the model are roughly analogous to 20 s in the Earth. The presence of a source region with significantly slower velocities than the surrounding region appears to lead to more complex signal, with more ringing than would be apparent if there were no such source region. The presence of such a source region appears to result in a relative amplification of the high frequency part of the signal. The frequencies analogous to 3 or 4 s in the Earth appear to be amplified relative to lower frequencies. Although the pencil lead source used in this study is not exactly similar to an explosion, this result may still be significant. When the source is set off in the garben in an off center position, a radiation pattern is established, with amplitude varying by a factor of 2 or more. Material effects appear to be accentuated when the source is excited off center.
Download or read book Modelling Seismic Wave Propagation for Geophysical Imaging written by J. Tago and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Earth is an heterogeneous complex media from the mineral composition scale (10-6m) to the global scale ( 106m). The reconstruction of its structure is a quite challenging problem because sampling methodologies are mainly indirect as potential methods (Günther et al., 2006; Rücker et al., 2006), diffusive methods (Cognon, 1971; Druskin & Knizhnerman, 1988; Goldman & Stover, 1983; Hohmann, 1988; Kuo & Cho, 1980; Oristaglio & Hohmann, 1984) or propagation methods (Alterman & Karal, 1968; Bolt & Smith, 1976; Dablain, 1986; Kelly et al., 1976; Levander, 1988; Marfurt, 1984; Virieux, 1986). Seismic waves belong to the last category. We shall concentrate in this chapter on the forward problem which will be at the heart of any inverse problem for imaging the Earth. The forward problem is dedicated to the estimation of seismic wavefields when one knows the medium properties while the inverse problem is devoted to the estimation of medium properties from recorded seismic wavefields.
Download or read book Modelling Seismic Wave Propagation for Geophysical Imaging written by Jean Virieux and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Modeling of Seismic Wave Propagation written by Johan O. A. Robertsson and published by SEG Books. This book was released on 2012 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decades following SEG's 1990 volume on numerical modeling showed a step change in the application and use of full wave equation modeling methods enabled by the increase in computational power. Full waveform inversion, reverse time migration, and 3D elastic finite-difference synthetic data generation are examples. A searchable CD is included.
Download or read book Numerical Modeling of Seismic Wave Propagation written by K. R. Kelly and published by SEG Books. This book was released on 1990 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Wave Propagation in Non Homogeneous Elastic Media by Boundary Elements written by George D. Manolis and published by Springer. This book was released on 2016-09-23 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the mathematical potential and computational efficiency of the Boundary Element Method (BEM) for modeling seismic wave propagation in either continuous or discrete inhomogeneous elastic/viscoelastic, isotropic/anisotropic media containing multiple cavities, cracks, inclusions and surface topography. BEM models may take into account the entire seismic wave path from the seismic source through the geological deposits all the way up to the local site under consideration. The general presentation of the theoretical basis of elastodynamics for inhomogeneous and heterogeneous continua in the first part is followed by the analytical derivation of fundamental solutions and Green's functions for the governing field equations by the usage of Fourier and Radon transforms. The numerical implementation of the BEM is for antiplane in the second part as well as for plane strain boundary value problems in the third part. Verification studies and parametric analysis appear throughout the book, as do both recent references and seminal ones from the past. Since the background of the authors is in solid mechanics and mathematical physics, the presented BEM formulations are valid for many areas such as civil engineering, geophysics, material science and all others concerning elastic wave propagation through inhomogeneous and heterogeneous media. The material presented in this book is suitable for self-study. The book is written at a level suitable for advanced undergraduates or beginning graduate students in solid mechanics, computational mechanics and fracture mechanics.
Download or read book Seismic Resistant Design and Technology written by Dentcho Ivanov and published by CRC Press. This book was released on 2015-06-26 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: An earthquake is a powerful surface acoustic wave (SAW) generated by a seismic event, such as a volcano or motion of the Earth's layers, that propagates on the Earth's surface. This book explains the design of earthquake resistant structures using SAW techniques that offer a variety of experimental setups and theoretical models. Designs of protecti
Download or read book Modeling The Earth For Oil Exploration written by Klaus Helbig and published by Elsevier. This book was released on 2015-07-14 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an overview of the results of a European Union integrated program in which approximately two hundred earth scientists participated, drawn from all fields related to exploration. Two classes of modeling were addressed - geological modeling - the relationship between the conditions of sedimentation and the resulting reservoir conditions; and wave-propagation modeling - the investigation of wave-propagation through media of various degrees of complexity. Wave-propagation modeling was carried out either mathematically or physically with the most modern tools. An important aspect of the project was the inversion of seismic data, that is the determination of the parameters of the medium from observations. This problem is closely related to modeling since it is based on the inversion of the mathematical steps and often uses modeling for verification and updating. The geological data presents novel concepts with a coverage that is both broad in area and in discipline. The geophysical investigations are at the leading edge of current research. Although detailed results have been published separately by investigators, this volume is the only source of reference which summarises the results; but incorporating sufficient detail to enable the reader to follow the scientific reasoning.
Download or read book Seismic Modeling Capabilities at Union Oil and a Brief Introduction to Their Use written by Fred Mazzella and published by . This book was released on 198? with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Ultrasonic Nondestructive Evaluation written by Lester W. Schmerr Jr. and published by Springer. This book was released on 2016-04-30 with total page 765 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensively revised and updated second edition of a widely read classic presents the use of ultrasound in nondestructive evaluation (NDE) inspections. Retaining the first edition's use of wave propagation /scattering theory and linear system theory, this volume also adds significant new material including: the introduction of MATLAB® functions and scripts that evaluate key results involving beam propagation and scattering, flaw sizing, and the modeling of ultrasonic systems. elements of Gaussian beam theory and a multi-Gaussian ultrasonic beam model for bulk wave transducers. a new chapter on the connection between ultrasonic modeling and probability of detection (POD) and reliability models. new and improved derivations of ultrasonic measurement models. updated coverage of ultrasonic simulators that have been developed around the world. Students, engineers, and researchers working in the ultrasonic NDE field will find a wealth of information on the modeling of ultrasonic inspections and the fundamental ultrasonic experiments that support those models in this new edition.
Download or read book Wave Propagation and Scattering in Layered Media written by Mounir Bouden and published by . This book was released on 1990 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismic Wave Propagation Modeling written by and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). A hybrid, finite-difference technique was developed for modeling nonlinear soil amplification from three-dimensional, finite-fault radiation patters for earthquakes in arbitrary earth models. The method was applied to the 17 January 1994 Northridge earthquake. Particle velocities were computed on a plane at 5-km depth, immediately above the causative fault. Time-series of the strike-perpendicular, lateral velocities then were propagated vertically in a soil column typical of the San Fernando Valley. Suitable material models were adapted from a suite used to model ground motions at the US Nevada Test Site. The effects of nonlinearity reduced relative spectral amplitudes by about 40% at frequencies above 1.5 Hz but only by 10% at lower frequencies. Runs made with source-depth amplitudes increased by a factor of two showed relative amplitudes above 1.5 Hz reduced by a total of 70% above 1.5 Hz and 20% at lower frequencies. Runs made with elastic-plastic material models showed similar behavior to runs made with Masing-Rule models.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1992-12 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
