Last edited by Mat
Friday, April 24, 2020 | History

2 edition of From wide angle reflection to leaking mode seismograms - a theoretical and experimental study. found in the catalog.

From wide angle reflection to leaking mode seismograms - a theoretical and experimental study.

Christopher Noel Grant Dampney

From wide angle reflection to leaking mode seismograms - a theoretical and experimental study.

  • 56 Want to read
  • 14 Currently reading

Published .
Written in English

    Subjects:
  • Reflection (Optics),
  • Seismology -- Observations,
  • Physics Theses

  • Edition Notes

    Thesis (Ph.D.), Dept. of Physics, University of Toronto.

    GenreObservations
    ContributionsWest (supervisor)
    The Physical Object
    Pagination1 v. (various pagings)
    ID Numbers
    Open LibraryOL20172938M

    You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. reflection data clearly indicate that lateral velocity variations are nearly universal. We here present a method of calculating synthetic seismograms for refracted and reflected waves in realistic Earth structures. Asymptotic ray theory (cf. Cerven:~ et al., ; Cerven~, b) is File Size: 1MB. the acoustic reflection coefficients of an aluminium sheet or a concrete wall (non-reflecting rock strata) and plastic wrap (semi-reflecting strata). You also can observe seismic diffraction as the microphone array looks at the edge of a horizontal reflector. There is also opportunity to study the.


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From wide angle reflection to leaking mode seismograms - a theoretical and experimental study. by Christopher Noel Grant Dampney Download PDF EPUB FB2

Abstract (summary): Seismograms observed by a detector in the wide angle reflection to leaking mode region, (the intermediate zone), exhibit a plethora of interesting features.

Head waves form and interfere with directly reflected arrivals, supercritically reflected waves have unusually large amplitudes and the normal and leaking modes gradually become predominant Cited by: 2. From Wide Angle Rpf lection to Leaking Mode Seismograms - A Theoretical and Experimental Study.

by C.N.G. Dampnpy A ted in conformity with the requirements for the degree of Doctor of Philosophy in the University of Toronto Geophysics Laboratories Department of Physics University of Toronto March, TCited by: 2.

Low frequencies only were considered; two leaking modes (P̅ (+, −) and P̅(−, +)) and rays were used in the computations. Good agreement was obtained and the build-up of oscillatory seismograms for the ray theory by successively higher orders of Cited by: 4.

From Wide Angle Reflection To Leaking Mode Seismograms - A Theoretical And Experimental Study: Dampney, C.N.G.; TSpace is a free From wide angle reflection to leaking mode seismograms - a theoretical and experimental study.

book secure research repository established by University of Toronto Libraries to disseminate and preserve the scholarly record of University of Toronto. Abstract. Although the wide angle reflection method has been little used in the oceans, a well-developed mathematical theory and techniques for determining interval velocities within plane layers by this method have existed for 20 by: 3.

From Wide Angle Reflection To Leaking Mode Seismograms - A Theoretical And Experimental Study: Dampney, C.N.G.; A theoretical and experimental study of the polarization states of a Nd(3+):YAG laser: Dalgliesh, William Robert; Group duality and its applications in nuclear physics.

THEORETICAL REFLECTION SEISMOGRAMS FOR ELASTIC MEDIA* BY B. KENNETT”” ABSTRACT KENNETT, B. N.,Theoretical Reflection Seismograms for Elastic Media, Geophysical Prospect I.

Theoretical seismograms for an explosive source in a multilayered elastic medium are. The main experimental conclusions are: 1. Wide angle reflection energies are stronger than non-wide-angle reflections (up to twice as strong) but there is a big difference between observations and theoretical calculations that suggest the wide angle reflection energies are 15 times the nonwide-angle reflection by: 1.

Reflection seismograms from a simple model Figure describes the model parameters. Figure shows the horizontal and vertical components of the wavefield generated by the dual-operator modeling scheme using the model of Figure.

The reflections with zero-offset traveltime equal to, and seconds correspond, respectively, to the water. Study of elastic waves in boreholes is important for Seismograms in a cased borehole model for comparison 26 Seismograms in a damaged borehole for comparison 28 Reflection due to a From wide angle reflection to leaking mode seismograms - a theoretical and experimental study.

book outer-cylindrical layer 33 Low frequency acoustic logging The Gaussian beam and reflectivity methods are used to compute synthetic seismograms for simple models with interfaces and gradients.

From the results of these methods, seismic attributes are obtained and compared. It was found that both methods were able to simulate wide-angle From wide angle reflection to leaking mode seismograms - a theoretical and experimental study.

book attributes for the simple models by: The reflectivity method for the computation of synthetic seismograms, as devised by Fuchs, is extended to include the elastic transmission losses and time shifts due to.

Treatise on Geophysics, Second Edition, is a comprehensive and in-depth study of the physics of the Earth beyond what any geophysics text has provided previously.

Thoroughly revised and updated, it provides fundamental and state-of-the-art discussion of all aspects of geophysics. P-wave reflection coefficient (a) and phase angle (b) versus incidence angle. Simulation of seismograms in a 2-D viscoelastic Earth by pseudospectral present theoretical and.

Methods for the inversion of crustal refraction/wide-angle reflection traveltimes in 2D media have been developed by Spence et al. (), Huang et al. (), Firbas (), and Lutter et al. TSpace. TSpace is a free and secure research repository established by University of Toronto Libraries to disseminate and preserve the scholarly record of University of Toronto.

Sensitivity Study of Seismic Reflection/Refraction Data to the sufficient use of low frequencies and wide-angle both P-waves and mode-converted S-waves in the marine environment in the. Reflection matrix method Reflectivity method is a semi-analytic method for computing synthetic seismograms in layered elastic media.

The method has now been extended to anisotropic and laterally. The Seismic Wavefield provides a guide to the understanding of seismograms in terms of physical propagation processes within the Earth.

The focus is on the observation of earthquakes and man-made Author: Brian Kennett. The analysis of wide-angle recordings in controlled source seismics has been an important tool for imaging deep features of the lithosphere.

Here we present a simple method of directly calculating the depth to a reflector from wide-angle reflection data without knowing any velocity information or the interface structure of the overlying by: 2.

Law of Reflection: This law is utilized in the seismic reflection method. It states that “the angle of incidence is equal to the angle of reflection”. In case of I=0, the ratio of the reflected energy of P-wave, E r, to the incident energy, E i, is given by: E r / E i I=0.

In the processing of wide-angle reflection and refraction (WARR) data, synthetic seismograms are used to further constrain the results of seismic tomography.

[1] In earthquake seismology, synthetic seismograms are used either to match the predicted effects of a particular earthquake source fault model with observed seismometer records or to. A new seismic refraction and wide-angle reflection experiment in the Teisseyre–Tornquist Zone (TTZ) in Poland was conducting during July as an in.

An intermediate-level textbook on the origin and nature of earthquakes and what they reveal about the structure of the Earth's interior.

This second edition of Principles of Seismology has been extensively updated to present a modern approach to observation seismology and the theory behind digital seismograms.

For backscattering, the maximum scattering Q −1 is around k a ≈ and decreases rapidly at k a > for exponential correlation functions; while for large-angle forescattering, the plateau is quite wide after k a = (Wu,Frankel and Clayton, ). The numerical simulations agree well with the scattering by: 1.

Chapter 3B Seismic techniques L.W. Braile, G.R. Keller, S. Mueller, and C. Prodehl 3B Introduction Seismic techniques have been of great value in studies of continental rifts because they provide a relatively detailed image of lithospheric structure, including indications of seismic velocities which can be used to infer crust and upper mantle characteris- tics such as Author: L.W.

Braile, G.R. Keller, S. Mueller, C. Prodehl. Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator, commonly known by the trademark.

The combination of critical coupling and coupled mode theory in this study elevated the absorption performance of a graphene-based absorber in the near-infrared band, achieving perfect absorption in the double bands (% and %), owing to the guided mode resonance (the coupling of the leak mode and guided mode under the condition of phase Cited by: The synthetic seismograms are then used for comparison with seismic-reflection data to identify specific geologic formations and to refine depth estimates of those formations.

Shallow seismic reflection The seismic reflection technique involves no a priori assumptions about layering or seismic Size: 4MB.

This is often used in coincident reflection and wide-angle tomography, where ubiquitous interfaces such as the Moho are well suited to this form of representation (e.g. Chiu et al.,Farra and Madariaga,Williamson,Sambridge,Wang and Houseman,Zelt,Rawlinson et al., a, Rawlinson and Urvoy, ).

The Cited by: Start studying Geology 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Start studying Earth Science SOL Review. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Energy partition and attenuation in crusts with random heterogeneities. In heterogeneous crustal waveguides, the upper boundary is the free surface, which is a perfect reflector.

The lower boundary of the waveguide is the Moho discontinuity. For waves incident on the Moho discontinuity, part of the energy will leak into the upper by: Recent interest in the extraction of fine detail from field seismograms has stimulated the search for numerical modeling procedures which can produce synthetic seismograms for complex subsurface geometries and for arbitrary source-receiver by:   Enhanced broadband (– μm) absorption.

As the optimal periodicity for light trapping should be close to the target wavelength range, absorption enhancement in broader wavelength range can Cited by: The measurements of the velocity of compressional waves up to 10 kilobars for some specimens of rock, reported in part 1, are discussed with respect to the effects of porosity, alteration, anisotropy, and composition.

The relations of isotropic elasticity are shown to be approximately valid for a number of examples. the theoretical background of each algorithm and currently existing software.

It will also make sugges-tions for the model parametrization appropriate to each algorithm, and the treatment of source-time functions, instrument responses, attenuation, and scattering. Mathematical development of each algo-rithm can be found in textbooks in advanced and.

Start studying Earth/Space chapter 8. Learn vocabulary, terms, and more with flashcards, games, and other study tools. p-waves(primary): are compressional body waves. compressional-- waves can be generated by pushing and pulling on the end of the spring. p-waves are compressional body waves, so the vibration direction is parallel to the direction of wave movement.

Reflection and refraction of obliquely incident rays, 30 Critical refraction, 31 Diffraction, 31 Reflection and refraction surveying, 32 Seismic data acquisition systems, 33 Seismic sources and the seismic/ acoustic spectrum, 34 Seismic transducers, 39 Seismic recording systems, 41 Problems, 42 Further.

Start studying PSTest2. Learn vocabulary, terms, and more with flashcards, games, and other study tools.Multiple reflection is not likely to be of importance in the present phenomenon. Even granted the most favorable layering of the ground so thax multiple reflection will oc-cur, the waves as observed in the seismograms of artificial explosions show sustained oscillations before any reflection is observed.

[8] Ebook 2a shows an example of raw seismograms observed by the ebook measurement line for the S3 shot which is located at the cross point of north–south and east–west measurement lines (see Figure 1).The seismograms from the artificial shots, emitting mainly P wave around 10 Hz, clearly show the arrivals of the direct and refracted P by: