3 edition of Computation of synthetic seismograms for marine refraction studies found in the catalog.
Computation of synthetic seismograms for marine refraction studies
C. E. Keen
by Geological Survey of Canada, available from Print. and Pub., Supply and Services Canada in Ottawa, Hull, Quebec
Written in English
|Statement||C. E. Keen.|
|Series||Paper - Geological Survey of Canada ; 78-16, Paper (Geological Survey of Canada) ;, 78-16.|
|LC Classifications||QE185 .A42 no. 78-16, QE539 .A42 no. 78-16|
|The Physical Object|
|Pagination||28 p. :|
|Number of Pages||28|
|LC Control Number||79314152|
Seismic data from a km long refraction profile on Rockall Bank have been re-interpreted to determine a detailed velocity-depth structure. The analysis was carried out using synthetic seismograms to match the amplitude and waveforms of the experimental records. The Vancouver Island Seismic Project was conducted in to study the structure of the subducting oceanic Juan de Fuca plate and the overriding continental America plate. The .
winMASW® Academy (). It is the most complete version which implements a number of highly-innovative solutions and allows the precise reconstruction of the subsurface model through a number of possible approaches (see the Elsevier book "Surface Wave Analysis for Near Surface Applications").Main tools. A hybrid technique consisting of modal summation and subsequent finite differences modelling is applied for the computation of synthetic accelerograms.
Robert L. Nowack, Stephen M. Stacy, Synthetic Seismograms and Wide-angle Seismic Attributes from the Gaussian Beam and Reflectivity Methods for Models with Interfaces and Velocity Gradients, Seismic Waves in Laterally Inhomogeneous Media, /, (), (). It is shown how the computation time and memory requirements scale with the dimension of the parameter space and size of the ensemble. We use ray theory to compute the fundamental P and SH synthetic seismograms for a given source-receiver ge-ometry; the synthetics for an arbitrary fault orientation are produced by taking linear combinations.
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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.
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 a stack of layers on top of the reflecting medium.
Numerical details of this method are described, and a comparison with the ray-theoretical method, as devised by Müller, is 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.
Thesis A Generalized Ray Theory Synthetic Seismogram Program for Marine Crustal Seismic Refraction Studies. (PDF - Mb) A method of computing generalized ray theory (GRT) synthetic seismograms suitable for marine seismic refraction OBS studies. Albert J Rudman, Subhashis Mallick, Frazer, Peter Bromirski, Workstation computation of synthetic seismograms for vertical and horizontal profiles: A full wavefield response for a two-dimensional layered half-space, Computers & Geosciences, /(93)M, 19, 3, (), ().
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.
Summary. Po/So synthetic seismograms were computed for a variety of oceanic structures in order to model data from an mb= earthquake, recorded during the O. Comparison of ocean bottom seismometer data and synthetic seismograms for the Bay of Islands ophiolite, Journal of Geophysical Research: Solid Earth, /JBiB10p, 87, B10, (), ().
Request PDF | Least-square fitting of marine seismic refraction data | An iterative procedure is presented for fitting waveform data from a marine seismic refraction. 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 theoretical basis for the Radon transform pair for one Cartesian coordinate has appeared in the seismological literature. For a point source in plane or spherical geometry, or a line source in cylindrical geometry only the Radon transform for the direct problem (computation of synthetic seismograms) has been published.
John B. Sinton and L. Neil Frazer, A method for the computation of finite frequency body wave synthetic seismograms in laterally varying media, Geophysical Journal of the Royal Astronomical Society, 71, 1, (), ().
The interpretation of refraction profiles that traverse laterally varying velocity structures has been hindered by lack of a practical algorithm for computing synthetic seismograms. The technique we present here is equivalent to computing three synthetic seismograms in multilayered models, contrasted with N+ 1 seismograms for a typical brute-force approach, which reduces the work to 3/(N+ 1) or about a 90 per cent saving for 30 layers.
The lateral-homogeneity requirement will yield path-averaged structures which may form. A Comparison of Travel Time Inversions for Marine Refraction Profiles Article (PDF Available) in Journal of Geophysical Research Atmospheres 81(10). Calculation times are shortened by a factor of 20 to 30 compared with a general purpose computer with a capacity of several million floating point operations per second (MFLOP).
The rapid calculation of synthetic seismograms for complex models, high frequency sources and all offset ranges is a provision for modeling not only particular phases. Synthetic seismograms match amplitudes and travel times for all components only if a transversely isotropic model is used.
The data require a ~m-thick layer with ~16% shear wave anisotropy, overlying a m-thick isotropic region. This model agrees with drill core data showing 10m of silty clay overlying of sand. Accurate synthetic seismograms at teleseismic distances can be calculated by using a modified reflectivity approach with a slowness integral adapted to the epicentral distance to the receiver.
The resulting synthetic seismograms have minor dif- ferences in detail, (see Choy et al.,and Burdick and Orcutt, ); however, for the pur- pose of this study, the amplitudes of the refraction onsets derived by these three methods are suffi- ciently similar to enable any method to be used.
Reflection and Refraction The transmitter emits “sound” waves at a frequency of about kHz, in short pulses, of which there are between 10 and 60 per second depending on the tool manufacturer.
The energy spreads out in all directions. Imagine a pulse emanating from a Tx on a sonic tool. It will travel through the drilling mud and. Dispersion interpretation from synthetic seismograms and multi-channel analysis of surfa ce waves (MASW) J.
Tyler Schwenk*, Ri chard Miller, Julian Ivanov, Kansas Geological Survey, The .Elastic moduli calculation tool Synthetic seismograms (modal summation) both for Rayleigh & Love waves Computation of the apparent (or effective) dispersion curves (recommended for passive datasets e.g.
from ESAC analyses) Velocity-spectra inversion via synthetic seismogram computation: no need for.Coincident seismic reflection/refraction studies of the continental lithosphere: a global review, Computation of synthetic seismograms with the reflectivity method and comparison with observations, The deep seismic structure of Northern England and adjacent marine areas from the Caledonian Suture seismic project, Unpublished Ph.D.