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- Volume 5, Issue 2, 1957
Geophysical Prospecting - Volume 5, Issue 2, 1957
Volume 5, Issue 2, 1957
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A SMALL‐SCALE FIELD INVESTIGATION OF MOTION NEAR THE SOURCE *)
By R. G. MASONABSTRACTA seismic field investigation on a reduced scale is described. A falling weight was used as the source of energy, with a recording system which permitted the display on a cathode ray oscillograph of two dimensional pictures of ground displacement in the vertical plane containing the source. These permit a quantitative study of the magnitude and direction of displacement and of the instantaneous velocity of motion.
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REPRESENTATION OF DEPTH‐CONTOUR MAPS OF ARBITRARILY CURVED REFLECTION HORIZONS, INCLUDING REFRACTION OF RAYS, THREE‐DIMENSIONAL CASE*
Authors E. GRAESER, W. LODE and G. POTTABSTRACTA method of constructing depth contour maps of arbitrarily curved horizons obtained from seismic reflection surveys is discussed. This method takes into account three dimensional refraction, avoiding the construction of seismic cross sections of any kind. It requires little work even if refraction at several horizons is taken into account. The multiple layer problem is traced back to the single layer case. Discontinuities in velocity are also taken into account.
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QUELQUES CONSIDERATIONS SUR LES MESURES DE VITESSE EFFECTUEES DANS LES PUITS PAR L'AGIP MINERARIA EN ITALIE ET SPECIALEMENT DANS LA PLAINE DU PO *)
More LessABSTRACTThe numerous well velocity measurements carried out in Italy by Agip Mineraria are considered, in an attempt to establish some correlations between the determined velocities and the stratigraphical and lithological characteristics of the formations in which the measurements were made.
The distribution of the seismic velocity is discussed especially in relation to depth, age and lithologic composition of the Tertiary formations in the Po Valley.
Finally, mention is made of some satisfactory results newly obtained on the basis of such considerations, particularly for the delineation of stratigraphic traps.
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DIRECT RECORDING VS. FM RECORDING IN SEISMIC TAPE MACHINES *)
More LessABSTRACTThis paper describes the two methods of magnetic tape recording used today in the seismic industry. It discusses objectively the characteristics of both methods including historical material, discussion of circuitry, magnetic tape, drive systems, effects of flutter and harmonic distortion, signal transfer and tape transport construction. The paper also includes discussion of noise and reproduction of transient signals. Diagrams illustrating the two recording systems, their frequency response and phase shift characteristics, distortion and noise levels as well as typical wave forms, are also attached.
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PRINZIPIELLE BEMERKUNGEN ZU THEORIE UND PRAXIS DER METHODE DER ZWEITEN ABLEITUNG BEI DER INTERPRETATION GRAVIMETRISCHER MESSERGEBNISSE
More LessABSTRACTThe first part of the paper deals with theoretical considerations concerning the arithmetic mean of gravity values and its use with regard to the derivation of approximation formulae for the second derivative. In order to calculate the second derivative in practice the arithmetic mean. ḡ(r) of a continuum of gravity values on a circle of radius r is approximated by a Taylor polynomial and then replaced by the arithmetic mean gn(r) of n discrete gravity values. Because of the invariance of ġ(r) with regard to rotations of the coordinate system in the horizontal datum plane there exists a lower limit for the number n; this lower limit depends on the degree of the Taylor polynomial used in the formula for gzz.
The general results of the first part yield routine formulae for the special case of a regular hexagonal grid; these formulae are given and discussed in the second part of the paper. Three formulae are applied to the gravity data of the Los Angeles Basin. Some remarks concerning the comparability of different approximation formulae and some hints with regard to routine calculations conclude the paper.
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ON THE BEHAVIOUR OF A WORDEN GRAVIMETER FOR PERIODICAL VARIATIONS IN EXTERNAL TEMPERATURE AND RAPID VARIATIONS OF PRESSURE *)
More LessABSTRACT1. A Worden gravity meter has been tested for sinusoidal variations in the external temperature, by determining simultaneously the corresponding variations of temperature inside the Dewar vacuum bottle, and the variations in the readings.
A second Worden gravimeter has been tested for rapid variations in external pressure.
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Volume 72 (2023 - 2024)
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Volume 70 (2021 - 2022)
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Volume 69 (2021)
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Volume 68 (2020)
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Volume 67 (2019)
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Volume 66 (2018)
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Volume 65 (2017)
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Volume 64 (2015 - 2016)
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Volume 63 (2015)
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Volume 62 (2014)
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Volume 61 (2013)
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Volume 60 (2012)
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Volume 59 (2011)
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Volume 58 (2010)
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Volume 57 (2009)
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Volume 56 (2008)
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Volume 55 (2007)
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Volume 54 (2006)
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Volume 53 (2005)
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Volume 52 (2004)
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Volume 51 (2003)
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Volume 50 (2002)
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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)