3 edition of Review of methods for generating synthetic seismograms found in the catalog.
Review of methods for generating synthetic seismograms
by U.S. Army Cold Regions Research & Engineering Laboratory] in [Hanover, N.H
Written in English
|Series||CRREL report -- 85-10.|
|Contributions||Cold Regions Research and Engineering Laboratory (U.S.)|
|The Physical Object|
|Pagination||v, 39 p. :|
|Number of Pages||39|
Synthetic seismograms are critical in understanding seismic data. We rely upon them for an array of tasks, from identifying events on seismic data to estimating the full waveform for inversion. That said, we often create and use synthetic seismograms without much thought given to the input log data or erroneous synthetic results. The method of finite differences is applied to the elastic wave equation to generate synthetic seismograms for laterally varying seafloor structures. The results are compared with borehole seismic data from the Gulf of California (Deep Sea Drilling Project Site ) in which lines were shot over flat and rough topography. The significant new phenomenon observed in both the synthetic.
Keywords: synthetic seismograms, body waves, wave propagation, seismograms, deep earth structure, upper mantle, Earth’s core, Earth’s upper mantle, seismic attenuation, Earth models, elasticity, seismic scattering, earthquake sources, elastic anisotropy Cross-references: Normal modes and surface waves: theory, Body wave: ray methods and. Synthetic seismograms are usually generated from well log data for identifying reflection events on stacked seismic data corresponding to different subsurface rock interfaces. The sonic and density log curves are used for generating an impedance log and the reflectivity derived therefrom is convolved with a wavelet to produce a synthetic trace.
There is an extensive literature pertaining to various synthetic seismogram methods. However, much confusion on the terminology of various methods exists and only a few review-type papers are available Chapman, ; Helmberger and Burdick, ; Cerveny and Ravindra, ;and Cerveny et al., , Lay and Wallace, ). Normal moveout is rarely modeled on a synthetic, but it might be useful to identify reflectors on raw seismic records. Synthetic seismograms with multiple reflections. Synthetic seismograms from shear sonic data. Synthetic model of normal moveout. View the Case Histories in the next Section to see some really well done seismic models.
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Synthetic seismograms are at the heart of modern global seismology. For spherically symmetrical, that is, one-dimensional (1D), Earth models, normal-mode summation is the preferred method for the calculation of broadband seismograms (e.g., Dahlen and Tromp, ; Gilbert, ). Normal-mode synthetics incorporate effects due to fluid–solid.
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. FORTRAN program for generation of synthetic seismograms. Bloomington: Printed for authority of the State of Indiana, (OCoLC) Material Type: Government publication, State or province government publication: Document Type: Book: All Authors / Contributors: Albert J Rudman; Robert F.
Various methods of generating synthetic seismograms are reviewed and examples of recent applications of the methods are cited. Body waves, surface waves, and normal modes are considered. The analytical methods reviewed include geometric ray theory, generalized ray theory (Cagniard-de Hoop method), asymptotic ray theory, reflectivity method, full wave theory, and hybrid methods Author: Lindamae.
Peck. 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. Whatever method is used for generating the wavelet, it generates the synthetic trace, which is compared with the seismic data and interpretation made thereof.
Such a simplistic process for synthetic seismogram generation assumes normal incidence of the seismic waves, which is what is implied for stacked seismic data as well as the well log data. Introduction  With the availability of broadband records, generation of synthetic seismograms has become an important tool for evaluation of earth's interior and earthquake mechanism.
For such generation a great progress has been made in a vertically heterogeneous flat earth [Wang and Herrmann, ; Müller, ; Wang, ].In a spherical earth, some of the important methods to. method of generating synthetic seismograms for realistic earthquake sources.
A method of decomposing the resulting expressions is described and a critical comparison with other methods is presented. Efficient methods of generating and enumerating multireflected rays are suggested, based in part on the work of Hron ().
Summary. The computation of theoretical seismograms for models in which the elastic parameters and density vary only with depth (in a plane, cylindrical or spherical geometry) reduces to the solution of an ordinary differential equation plus the evaluation of inverse transformations.
The standard synthetic seismogram (SSS), as a control, is placed side by side with the other three generated pseudo synthetic seismograms (i.e. general linear pseudo-synthetic, general polynomial transformed and spliced pseudo-synthetic seismogram) in order to.
Abstract Ten methods for the computation of attenuation have been investigated, namely: amplitude decay, analytical signal, wavelet modelling, phase modelling, frequency modelling, rise‐time, pulse amplitude, matching technique, spectral modelling and spectral ratio.
In particular, we have studied the reliability of each of these methods in estimating correct values of Q using three. Generation of Pseudo-synthetic Seismograms from Gamma-Ray Well Logs water, or potassium feldspar can also result in high gamma-ray readings (Asquith and Gibson ).
Get this from a library. Computation of synthetic seismograms for marine refraction studies. [C E Keen] -- A method for calculating synthetic seismograms is presented which can be used for comparing real seismic refraction data obtained with ocean bottom seismometers with that computed for an assumed.
Most of the discussion is on the reflectivity method with the receiver within the reflectivity zone, but results using the ray method are shown for comparison.
Such synthetic seismograms can be used to interpret data from Oblique Seismic Experiments where shots generated on the surface up to large ranges are recorded in crustal boreholes. We outline a method of computing synthetic seismograms for stratified, azimuthally anisotropic, viscoelastic earth models.
This method is an extended form of the Kennett algorithm that is efficient for multioffset vertical seismic profiling.
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. 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 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.
The process of generating synthetics and calibrating them to real seismic data is as much an art as a science. List of Figures. Figure 1. Configuration of a Velocity Survey or VSP. Figure 2.
Synthetic Seismograms. Figure 3. A 2-D envelope model of a volcanic. ChirCor: A new tool for generating synthetic chirp-sonar seismograms Article in Computers & Geosciences 34(2) February with 89 Reads How we measure 'reads'.
The edited velocity and density profiles used for creating the synthetic seismograms are shown in Figure 9, Fig Fig Fig Fig and Figure Generation of the synthetic seismograms was performed using the Landmark "SynTool" module.Red-colored traces are synthetic displacements using the whole-space solution (multiplied by 2 to account for the free-surface eﬀect) 15 Observation of near ﬁeld at teleseismic distances from the Bolivia deep.
Synthetic seismograms for ISOP applications computed amplitudes and phase shifts of the order ray method approach, for example the absence individual waves match the observed seismogram of diffracted waves and unrealistic amplitudes in the well.