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- Volume 13, Issue 1, 1965
Geophysical Prospecting - Volume 13, Issue 1, 1965
Volume 13, Issue 1, 1965
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SUR LA DEFINITION DE L'ANOMALIE DE BOUGUER ET SES CONSEQUENCES PRATIQUES*
Authors H. NAUDY and R. NEUMANNABSTRACTWhen interpreting Bouguer Anomalies, it is important that the location of the point to which the corrected measurement is related, is correctly defined: the station itself or its projection on the datum plane. The consequences of this choice are not negligeable when the topography is rough.
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CHARTS FOR DETERMINING THE GRAVITY EFFECT OF TWO‐ AND THREE‐DIMENSIONAL BODIES BOUNDED BY ARBITRARY POLYGONS*
More LessABSTRACTCharts are presented for the computation of the vertical component of the attraction of horizontal laminas and of horizontal cylinders bounded by irregular w‐sided polygons. Contrary to older methods no restricting conditions are made for the directions of the sides of the polygons.
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LE MAGNETOMETRE AEROPORTE MP 121 SUD‐AVIATION
By J. THOMASAbstractProton precession magnetometers usually operate discontinuously since thy rely one intermittent impulses. The aerial versions of these magnetometers suffer from relatively high background noise. The type of magnetometer discussed in this paper has solved the two problems of discontinuity of measurements and reduced sensitivity due to background noise.
Comparative texts with an established flux‐gate apparatus have given significant and convincing results.
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A SIMPLE METHOD FOR THE CALCULATION OF STANDARD‐GRAPHS TO BE USED IN GEO ELECTRICAL PROSPECTING*
More LessABSTRACTThe paper describes a new method for the calculation of standard‐graphs i.e. resistivity‐curves for assumed resistivity profiles. It starts from the integral of Stefanesco and arrives at a system of image poles, similar to, but simpler than earlier developed systems. The advantages of the new method are described, the accuracy is discussed and it is indicated how the accuracy can be improved by a simple artifice.
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INFLUENCE DE LA LARGEUR DU PAS D'ECHANTILLONNAGE DU CAROTTAGE CONTINU DE VITESSES SUR LES SISMOGRAMMES SYNTHETIQUES A MULTIPLES*
Authors P. BOIS, CH. HEMON and N. MARESCHALAbstractAttenuation caused by transmission is known to be the greater the closer the samples are taken together. As a result, the amplitudes of seismograms with multiple reflections can be expected to be negligible within a more or less brief time interval, as is the case for seismograms without multiple reflections with attenuation. This paper examines the process by which multiple reflections regenerate these greatly attenuated reflections. It is also ascertained that a sampling interval of one ms for continuous velocity logs is valid for any survey. For economic reasons, we recommend the selection of a larger interval without, however, overdoing things and thus losing too much information.
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SYNTHETIC SEISMOGRAMS APPLIED TO THE SEISMIC INVESTIGATION OF A COAL BASIN*
More LessABSTRACTIn the present study an attempt is made to relate the general pattern of reflection seismograms obtained over a coal basin to the acoustical properties peculiar to the Coal Measures. The Carboniferous is characterized by a very rapid succession of distinct lithological units, resulting in a surprising variability in their physical properties. Coal seams in particular are conspicuous by their low density and velocity and they produce acoustical contrasts of 35–50 % with respect to country rock. The resulting heavy shielding action prevents the seismic energy from penetrating deeply into this type of formation.
With the aid of synthetic seismograms, arranged into synthetic profiles, it is shown that only a minor part of the Coal Measures reflections is of primary origin. The majority has a secondary character brought about by reverberations inside the weathering zone. Thus the conclusion is reached that reflection shooting allows of mapping only the structure of the top section of the Carboniferous, which is sufficient for the purposes of the coalmining industry.
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SECURITE EXAMEN STATISTIQUE DE 1200 ACCIDENTS GEOPHYSIQUES*
By H. RICHARDABSTRACTMore than 1200 cards on geophysical accidents have been accumulated since 1957. Classification of these cards into various categories reveals relative stability in terms of time. It is possible to determine a highly significant severity rating for each category. The greatest hazards are explosion and electrocution.
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BOOK REVIEWS
Book reviewed in this article:
S. I. Kuznetsov, M. V. Ivanov and N. N. Lyalikova, Introduction to Geological Microbiology
Organic Geochemistry, Editor I. A. Breger
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Volume 49 (2001)
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Volume 48 (2000)
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Volume 47 (1999)
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Volume 46 (1998)
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Volume 45 (1997)
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Volume 44 (1996)
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Volume 43 (1995)
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Volume 42 (1994)
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Volume 41 (1993)
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Volume 40 (1992)
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Volume 39 (1991)
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Volume 38 (1990)
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Volume 37 (1989)
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Volume 36 (1988)
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Volume 35 (1987)
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Volume 34 (1986)
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Volume 33 (1985)
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Volume 32 (1984)
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Volume 31 (1983)
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Volume 30 (1982)
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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)