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Friday, May 8, 2020 | History

2 edition of Generation of synthetic seismograms for an acoustic layer over an acoustic half space found in the catalog.

Generation of synthetic seismograms for an acoustic layer over an acoustic half space

L. Neil Frazer

Generation of synthetic seismograms for an acoustic layer over an acoustic half space

by L. Neil Frazer

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  • 2 Currently reading

Published by Dept. of Natural Resources, Geological Survey in Bloomington, Ind .
Written in English

    Subjects:
  • Seismometers -- Computer programs.

  • Edition Notes

    Bibliography: p. 8.

    Statementby L. Neil Frazer and Albert J. Rudman.
    SeriesGeophysical computer program -- 8, Geological Survey occasional paper -- 35
    ContributionsRudman, Albert J.
    The Physical Object
    Pagination62 p. :
    Number of Pages62
    ID Numbers
    Open LibraryOL15977182M

      The interpretation of seismic data, in particular oceanic refraction data, has improved considerably, in recent years using synthetic seismograms. Several different methods have been developed for computing synthetic seismograms and within the limitations of the various approximations, shown to give equivalent results. The computation of theoretical seismograms can be divided into two . This book introduces a methodology for solving the seismic inverse problem using purely numerical solutions built on 3D wave equations and which is free of the approximations or simplifications that are common in classical seismic inversion methodologies and therefore applicable to arbitrary 3D geological media and seismic source models.

    Layer parameters Source Receiver • Calculates a complete 3D body-wave seismogram in the frequency-wavenumber domain. • Includes all multiples and mode conversions. • Has been extended to the anisotropic and visco-elastic cases. • Layer propagation done with Propagator Matrices which predict infinitely many multiples and multi-modes. The period and the wavelength are related by a simple expression connecting the two with the speed of the wave. wavelength = speed x period. Note that the units of the quantities on both sides of the equation balance: wavelength is a measure of distance, such as kilometers, speed is usually specified in terms of kilometers/second, and period is measured in seconds.

    April,04, 3 the wave propagation in the x-direction. k n is the wavenumber, c 1 is the minimum phase velocity and c n = ω k n is the maximum phase velocity. The displacement varies with depth as the cosine term of equation (5) show, and so it Size: KB. In practice, synthetic seismograms are rarely a perfect match to field data. There are many reasons for this. Frequency—Sonic logging operates in the kilohertz frequency range (high frequency short wavelength), while seismic data are typically 10–90 Hz (low frequency, long wavelength). This means the sonic log is influenced by a tiny volume Link: Web page.


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Generation of synthetic seismograms for an acoustic layer over an acoustic half space by L. Neil Frazer Download PDF EPUB FB2

Generation of synthetic seismograms for an acoustic layer over an acoustic half space. Bloomington, Ind.: Dept. of Natural Resources, (OCoLC) Document Type: Book: All Authors / Contributors: L Neil Frazer; Albert J Rudman.

Synthetic Seismogram. Synthetic seismograms are then computed by the modal summation technique for sites placed at the nodes of a grid with a step of ° × ° that covers the national territory, considering the average structural model associated with the regional polygon that includes the site.

SYNTHETIC SEISMOGRAM GENERATION AND SEISMIC FACIES TO CORE LITHOLOGY CORRELATION FOR SITES, AND A.D. Cunningham2 and A.W. Droxler3 ABSTRACT One-dimensional synthetic seismograms are constructed from velocity and density measurements taken during Ocean Drill-ing Program (ODP) Leg at Sites, and Synthetic seismograms created using this velocity log correlate well with the seismic data over the site.

Because of the possibility that the physical properties measurements yielded more accurate values than the sonic log measurements, a second velocity profile was created in which the sonic log values were multiplied by rather than.

A synthetic seismogram is the result of forward modelling the seismic response of an input earth model, which is defined in terms of 1D, 2D or 3D variations in physical properties. In hydrocarbon exploration this is used to provide a 'tie' between changes in rock properties in a borehole and seismic reflection data at the same location.

It can also be used either to test possible. The result of one of many forms of forward modeling to predict the seismic response of the Earth. A more narrow definition used by seismic interpreters is that a synthetic seismogram, commonly called a synthetic, is a direct one-dimensional model of acoustic energy traveling through the layers of the Earth.

The synthetic seismogram is generated by convolving the reflectivity derived from. Acoustic Lance: New in situ seafloor velocity profiles, J. Acoust. Soc. Am., 99, Generation of synthetic seismograms for an acoustic layer over an acoustic half space, Indiana Geological Survey, Occasional Paper Series, No.

-- It is difficult to compute synthetic seismograms for a layered half-space with sources and receivers at close to or the same depths using the generalized R/T coefficient method (Kennett, half-spaces in welded contact along a plane boundary.

In the present work we have extended our former results to multilayered half-space models, thus providing a useful method of generating synthetic seismograms for realistic earthquake sources.

A methodFile Size: KB. Utilize the dispersion relations and amplitude functions (eigenvalues) for Rayleigh or Love (SH) motion to determine the amplitude and phase spectrum for a layered half space at a given distance. Fourier transformation then yields the synthetic surface wave seismograms.

Synthetic seismograms have long been used in both the investigation of Earth structure and in the determination of earthquake source parameters.

Until recently, however, there were relatively few methods for the routine generation of synthetic seismograms. Synthetic Seismograms: Preparation, Calibration, and Associated Issues P-wave acoustic velocity and bulk density.

In acquiring seismic data, at the simplest, a seismic compressional wave (P-wave) is generated with a surface source; the wave travels at the acoustic velocity of the rock, which varies with lithology; the wave bounces off.

Vertical displacements produced by an explosion in a two liquid half-space model, located 5 km above the contact interface. The P velocity in the top half-space is 5 km/s, and km/s in the bottom half-space 24 Vertical displacements from a strike-slip fault at 5 km depth in a uniform half-space (V p km/s, V.

The synthetic seismogram is generated by convolving the reflectivity derived from digitized acoustic and density logs with the wavelet derived from seismic data. By comparing marker beds or other correlation points picked on well logs with major reflections on the seismic section, interpretation of.

synthetic seismograms The final product of our step-by-step procedure to create a seismic model is a synthetic seismogram or a synthetic seismic section. The use of edited or modeled log data as input is highly recommended.

GCSynthetic Seismograms for PS Seismic Data* Satinder Chopra1 and Ritesh Kumar Sharma1 Search and Discovery Article # () Posted Ap *Adapted from the Geophysical Corner column, prepared by the authors, in AAPG Explorer, April, HSP test case: pressure synthetic seismogram for liquid layer over elastic layer over elastic half space (Table 1).

Seismogram simulates sonobuoy profile of Figure 5. Prominent events identified by apparent velocity and curvature are: D (direct water wave), HI and H2 (bead waves), R1 and R2 (primary reflections), M l and M2 (multiple Cited by: 2.

extrapolation from either the first layer or the half space. ANALYSIS OF THE SYNTHETIC SEISMOGRAMS The model for synthetic data can be constructed from sonic and log data by making equal time layers (Margrave, ). Figure 3 shows the log data and impedance curve from the horizontal layers with equal traveltime of s.

Q for each layer is Synthetic Seismogram Calculation using the Reflectivity Method. Purpose of the code: Compute complete synthetic seismograms based on the following required elements: (1) A 1-D layered earth model containing Vp, Vs, density, Qa, Qb (Qs are quality factors of the material related to P and S speeds, inverse of attenuation) of each Size: 76KB.

Well, actually I only have a sonic log for these reason I am going to generate 2 synthetic seismograms, in the first case I will consider a density as a constant (value=1) and in the second case I. Over the last few years, several articles on multicomponent seismic data have appeared in Geophysical Corner describing various aspects of processing and interpretation of such data.

In this article, we address an important question about correlation of synthetic seismograms with .Definitions for Synthetic Seismograms. Synthetic seismograms are computed by assuming a mathematical model with a particular geometry of the source and velocity layering that approximates an elastic or anelastic earth.

Acoustic Elastic Seismic (anelastic) fluid, pressure wave only.Synthetic seismograms often utilize sonic and density logs to produce impedance profiles in order to model seismograms in order for us to pick reflections on seismic data.

Synthetic sonic logs, as initially described by Lindseth (), utilize seismic data in order to estimate acoustical impedance.