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  • 1
    Online Resource
    Online Resource
    Dispersion dependence for Rayleigh‐like vibrations in a low‐density channel
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Solid Earth Vol. 96, No. B12 ( 1991-11-10), p. 20325-20330
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 96, No. B12 ( 1991-11-10), p. 20325-20330
    Abstract: Although it is in principle possible to compute dispersion curves for a buried low‐density channel by numerical means, the interpretation of such results is fraught with uncertainty relating to numerical approximations, inaccuracies, and a poorly developed theoretical framework for Rayleigh waves. It is thus interesting to investigate by analytical techniques some simple cases. One of these is a study of the Rayleigh wave in an idealization of a low‐density channel. Such a channel has at least two stationary vibration points and numerous modes with complex wave number as well as the usual four propagating Rayleigh modes. The stationary points are interesting because they correspond to resonant vibrations in an unbounded medium. The algebra required to investigate even this idealized case of a layer bounded above and below by high‐density plates and overlying an elastic half‐space is tedious. It can be automated quite effectively with Mathematica. This algebraic manipulation program also provides simple effective graphics tools to study the qualitative behavior of the results.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JB01889
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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    detail.hit.zdb_id: 3094104-0
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    detail.hit.zdb_id: 2403298-0
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    detail.hit.zdb_id: 2969341-X
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
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    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Time delays in geophysical consolidation problems
    Seismological Society of America (SSA) ; 1984
    In:  Bulletin of the Seismological Society of America Vol. 74, No. 4 ( 1984-08-01), p. 1275-1287
    Details
    In: Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 74, No. 4 ( 1984-08-01), p. 1275-1287
    Abstract: The tectonic response of the lithosphere to loads applied over a period of years is one of the few relatively direct ways of measuring lithospheric mechanical properties. We discuss here a method for estimating gross permeability of shallow lithosphere if such a lithosphere can be modeled as a Biot solid. Induced seismicity at artificial lakes sometimes lags the history of lake filling. Clearly this indicates the anomalous load takes some finite time to create a stress increment over the tectonic regime associated with the lake. Such delays may result from diffusion into inhomogeneous regimes, but intuitively it seems that the Biot consolidation theory ought to contain the physics required to produce delayed response in the simplest model, an isotropic half-space with arbitrary vertical layering. The response of such a half-space can be calculated most quickly from matrix solutions of first-order differential equations. We explore here a consistent formulation for the physics of the problem and examine the relation between the rate of diffusion of changes on the boundary, the geometry of the boundary change, and the physical properties of the material. The resulting formulas can be used to estimate probable delays in response of the physical system. Unfortunately, the values of physical properties required to make such estimates are hard to obtain.
    Type of Medium: Online Resource
    ISSN: 1943-3573 , 0037-1106
    URL: Article
    DOI: 10.1785/BSSA0740041275
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 1984
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Repeated Geodetic Surveys as Experiments in Geophysics
    Canadian Science Publishing ; 1977
    In:  The Canadian Surveyor Vol. 31, No. 4 ( 1977-12), p. 347-360
    Details
    In: The Canadian Surveyor, Canadian Science Publishing, Vol. 31, No. 4 ( 1977-12), p. 347-360
    Type of Medium: Online Resource
    ISSN: 0008-5103
    URL: Article
    DOI: 10.1139/tcs-1977-0045
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1977
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  • 4
    Online Resource
    Online Resource
    Book review
    Springer Science and Business Media LLC ; 1989
    In:  Pure and Applied Geophysics PAGEOPH Vol. 130, No. 4 ( 1989), p. 751-779
    Details
    In: Pure and Applied Geophysics PAGEOPH, Springer Science and Business Media LLC, Vol. 130, No. 4 ( 1989), p. 751-779
    Type of Medium: Online Resource
    ISSN: 0033-4553 , 1420-9136
    URL: Article
    DOI: 10.1007/BF00881610
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1989
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    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Body Force Equivalents as Sources of Anelastic Processes
    Canadian Science Publishing ; 1971
    In:  Canadian Journal of Earth Sciences Vol. 8, No. 10 ( 1971-10-01), p. 1184-1189
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 8, No. 10 ( 1971-10-01), p. 1184-1189
    Abstract: Once a failure criterion and a rule for conversion of mechanical into thermal energy are established, linear elastic materials can be made to behave, theoretically at least, in a highly anelastic fashion. Such hypothetical materials could be of particular value in the analysis of slow deformation of the earth.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e71-108
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1971
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    detail.hit.zdb_id: 1491201-6
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Calculation of Body Force Equivalents from the Permanent Deformation Field: An Application of FORMAC
    Seismological Society of Japan ; 1968
    In:  Journal of Physics of the Earth Vol. 16, No. Special ( 1968), p. 153-153
    Details
    In: Journal of Physics of the Earth, Seismological Society of Japan, Vol. 16, No. Special ( 1968), p. 153-153
    Type of Medium: Online Resource
    ISSN: 1884-2305 , 0022-3743
    URL: Article
    DOI: 10.4294/jpe1952.16.Special_153
    Language: English
    Publisher: Seismological Society of Japan
    Publication Date: 1968
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    A Compiler for Algebraic Manipulations with Applications to Geophysics
    Seismological Society of Japan ; 1968
    In:  Journal of Physics of the Earth Vol. 16, No. Special ( 1968), p. 43-50
    Details
    In: Journal of Physics of the Earth, Seismological Society of Japan, Vol. 16, No. Special ( 1968), p. 43-50
    Type of Medium: Online Resource
    ISSN: 1884-2305 , 0022-3743
    URL: Article
    DOI: 10.4294/jpe1952.16.Special_43
    Language: English
    Publisher: Seismological Society of Japan
    Publication Date: 1968
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    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Dams and Earthquakes
    Elsevier BV ; 1977
    In:  Engineering Geology Vol. 11, No. 3 ( 1977-9), p. 239-
    Details
    In: Engineering Geology, Elsevier BV, Vol. 11, No. 3 ( 1977-9), p. 239-
    Type of Medium: Online Resource
    ISSN: 0013-7952
    URL: Article
    DOI: 10.1016/0013-7952(77)90005-9
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1977
    detail.hit.zdb_id: 1500329-2
    SSG: 19,1
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  • 9
    Online Resource
    Online Resource
    Automated stratigraphic interpretation of well‐log data
    Society of Exploration Geophysicists ; 1987
    In:  GEOPHYSICS Vol. 52, No. 12 ( 1987-12), p. 1665-1676
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 52, No. 12 ( 1987-12), p. 1665-1676
    Abstract: A computerized well‐log stratigraphic interpretation system based on artificial intelligence can be seen as two steps, contact recognition and interval identification. Unlike previous approaches to mathematical zonation which are essentially statistical, consideration of the geologic environment is included for effective interpretation. Following the logic of human experts, the system first determines the log signature of the contacts. An algorithm incorporating linear regression with variable breakpoints is used to describe the structure of log curves. Log features are mapped to the assigned signature of contacts. Multiple logs are taken into account to set up the final set of contacts, which divides the test borehole into a string of intervals with attributes. A pattern string of intervals is based on the integrated geologic column for the section where the borehole is located. A string‐to‐string matching program then determines the optimal map of the test borehole as the pattern to generate a geologic column based on the computer suggestion. The cost formulas for matching represent knowledge about the stratigraphy of the area under study, and the string‐to‐string matching algorithm includes this knowledge of stratigraphy. In test boreholes in an oil‐sand deposit, 86 percent of the computer identifications of intervals were consistent with those determined by geologists from core descriptions, suggesting that the design concept and computer algorithm are consistent with the characteristics of the interpretation problem.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1442283
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1987
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Pattern analysis of seismic records
    Society of Exploration Geophysicists ; 1990
    In:  GEOPHYSICS Vol. 55, No. 1 ( 1990-01), p. 20-28
    Details
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 55, No. 1 ( 1990-01), p. 20-28
    Abstract: The three steps in automated analysis of seismic records are trace matching, event detection, and seismic zoning. Our algorithm matches traces by comparing sequences of peaks on neighboring traces and edits pairs of peaks identified as similar for consistency in trend across and down the record. By combining connected pairs, we obtain laterally coherent events of varying quality which divide a record into zones that may have lithologic significance. These zones can be obtained automatically by applying cluster analysis to seismic attributes and other discriminating properties of these events. On common‐shot gathers from a four‐fold survey in Saskatchewan, Canada, the coherent events which we detected this way are consistent with those recognized visually and are associated with clear formation boundaries. Strong reflections correspond to events detected with high confidence, and the seismic zones show good correlation among shot records. High detection confidence and good correlation indicate that the application of automatic analysis procedures to common‐midpoint gathers from surveys of higher multiplicity is possible and may lead to a new and quick way of obtaining velocity profiles. Zoning, if done properly, provides a compact description of seismic records that may simplify telemetry of large volumes of data.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    URL: Article
    DOI: 10.1190/1.1442768
    RVK:
    UA 4068.4
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 1990
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    detail.hit.zdb_id: 2184-2
    SSG: 16,13
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