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- Volume 11, Issue 2, 1963
Geophysical Prospecting - Volume 11, Issue 2, 1963
Volume 11, Issue 2, 1963
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THE QUANTITATIVE RECORDING OF SEISMIC EVENTS WITH EXTREMELY LARGE AMPLITUDE VARIATIONS BY DISCONTINUOUS GAIN CONTROL*
Authors O. ROSENBACH, O. SCHMITT and R. VEESAbstractA transistorized combination of multivibrators is described, by which the gain is set according to a time programme. This equipment allows quantitative recording of seismic events with extremely large amplitude variations. Some possible applications of this recording system to seismic research are discussed.
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LES FILTRES EN EVENTAIL*
Authors J. P. FAIL and G. GRAUAbstractThe theory of filters that may separate events with different apparent velocities (fan filters) is studied. The filtering operator is determined from the two‐dimensional spectrum (in frequence – wave number space) of such filters.
Practical use of fan filters for signal enhancement is described, as well as possible changes in field techniques, which might be necessary for convenient and efficient fan filtering.
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A STATISTICAL STUDY OF ISOSTASY*
More LessAbstractIsostasy was regarded as the impulse response to topographic loading, hence convolution with the topography should generate the observed gravity anomalies. Ordinate values of the impulse response were indeterminate but the zeroth, first and second moments were found to be significant. These could be interpreted as the degree of compensation, its spread, and the displacement with respect to the loading.
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SOME THEORETICAL ASPECTS OF ELECTRODE POLARIZATION IN ROCKS*
Authors B. K. BHATTACHARYYA and H. F. MORRISONAbstractA study has been made on the influence of the several variables of an electrode‐electrolyte system on the different parameters usually measured in connection with the induced polarization method of geophysical exploration. Both the reaction resistance and the Warburg impedance of the system are found to vary appreciably with active ion concentration. The activation energy barrier exerts a predominant influence only on the former, whereas the salt concentration is important to a small degree in the determination of only the latter.
With a simple equivalent electrical circuit to represent the complex mechanism of conduction of electrical currents through mineralized rocks, the amplitude and phase of the metal factor are evaluated at a frequency of 10 cps. An analysis is then made to determine the build‐up and decay characteristics of the transient signal in the rock induced by a rectangular current pulse. All these measurable quantities are highly dependent on the salt and active ion concentrations. It is interesting to note that the build‐up or decay time of the transient signal increases normally as the square of the solution resistance and inversely as the square of the Warburg impedance. The activation energy barrier exerts, practically no influence on the metal factor nor on the transient signal.
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EVOLUTION DE L'ACTIVITE GEOPHYSIQUE DE SURFACE (PETROLE)*
Authors R. DESAINT and H. RICHARDAbstractFrom data published in various journals, as for instance “Geophysics”, a lot of information can be gathered on the geophysical activity in the world. In this article the evolution of this activity is discussed, as far as it concerns the search for hydrocarbons.
An interesting part of such a study consists of a comparison of the geophysical activity with the activity in drilling and the extent of the discovered reserves. In the USA in particular the amount of data available is sufficient to make a detailed analysis possible.
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BOOK REVIEWS
Books reviewed in this article:
Applied Geophysics U.S.S.R., Translator and editor: Nicholas Rast
Jean Goguel, Tectonics, pages: viii
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Volume 29 (1981)
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Volume 28 (1980)
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Volume 27 (1979)
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Volume 26 (1978)
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Volume 25 (1977)
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Volume 24 (1976)
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Volume 23 (1975)
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Volume 22 (1974)
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Volume 21 (1973)
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Volume 20 (1972)
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Volume 19 (1971)
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Volume 18 (1970)
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Volume 17 (1969)
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Volume 16 (1968)
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Volume 15 (1967)
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Volume 14 (1966)
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Volume 13 (1965)
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Volume 12 (1964)
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Volume 11 (1963)
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Volume 10 (1962)
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Volume 9 (1961)
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Volume 8 (1960)
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Volume 7 (1959)
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Volume 6 (1958)
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Volume 5 (1957)
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Volume 4 (1956)
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Volume 3 (1955)
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Volume 2 (1954)
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Volume 1 (1953)