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- Volume 1, Issue 4, 1953
Geophysical Prospecting - Volume 1, Issue 4, 1953
Volume 1, Issue 4, 1953
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SOME PRACTICAL EXAMPLES OF INTERPRETATION OF TELLURIC METHODS IN LANGUEDOC (SOUTH‐EASTERN FRANCE)*
Authors M. MAINGUY and A. GREPINAbstractIn the region covered by the paper, electrical methods have been applied in four different zones:
- a) Ales‐Maruejols Basin (resistive lower Oligocene blanketed by conductive Upper Oligocene);
- b) Ledignan and Vaunage‐Lunel anticlines (faulted structures in the marly and limy Cretaceous, with different resistivities;
- c) Camargue (thick series of conductive sediments);
- d) Beziers Basin (highly complicated structures in the Mesozoic, widely blanketed by conductive Miocene).
It may be assumed that electrical methods can yield valuable information enabling one to define the rugged subsurface topography of resistive strata burried under a reasonably thick cover of conductive sediments especially when a part of the lower formation outcrops even if the part exposed be small. Faults may be delineated and much, more information is obtainable than can be expected from gravity meter survey at a price not very much higher.
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GEO‐ELECTRICAL PROBLEMS OF THE HYDROLOGY OF WEST GERMAN AREAS*
More LessAbstractThe supply of drinking water and water for general use in the towns and communities of Western Germany is in many cases insufficient. In order to eliminate the difficulties in the supply of water, geophysical methods have been applied to a large extent since the end of the war.
The most important hydrological problems, which were solved successfully by geo‐electrical measurements, are as follows:
- 1 Search for, and delimitation of, areas with salty ground water.
- 2 Investigation of the geological situation in catchment areas for large waterworks, and the finding of suitable places for the establishment of new plants, and in particular.
- 3 Search for and determination of the thickness and nature of water‐bearing sands and gravels and of the relief of the underlying impervious strata.
Some typical examples are presented herewith.
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BEITRAG ZUR INTERPRETATION VON SCHWEREBILDERN MIT HILFE HöHERER ABLEITUNGEN*
By B. KOSBAHNAbstractFor the treatment of the problems involved in the interpretation of gravity pictures this paper gives a formula that holds generally for any potential function. It provides an extended applicability of the relation used by Elkins for the computation of the second derivative, and also yields an analogous relation to derivatives of higher order of the gravity field.
This relation has not been utilized to determine in details the course of the derivatives of higher order in a plane, but is merely applied to points of comparatively extreme curvature of the isogams where the differential values present a ratio favourable to the “noise level”. By this method the values of the derivatives of higher order will not be determined themselves but only the ratio's responsible for the depth of divergence in comparison with the course of an anomaly of masses replaced by points.
It is shown by examples of intercalated masses that the divergence points are important and by law related to the form and position of the density contrasts themselves.
An analysis of the total gravity picture is made possible by progressing from elements close to the surface to deeper ones. In this way the fundamental features of the earth's crust will be obtained. The application of the analysis process to a gravity anomaly actually measured in Northwest Germany is given.
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THE INITIAL ADJUSTMENTS OF VERTICAL VARIOMETERS*
More LessAbstractUsing a comprehensive theory of the vertical force variometer, it is shown that the mean of the two readings taken in azimuths 180 degrees apart only eliminates the error of misorientation and of inclination of the knife edge if these factors are sufficiently small. The necessary accuracy in the 180 degree rotation and in the readjustment of the levels are investigated and a practical test is developed to allow the initial adjustments to be determined. Finally, a brief description of a new variometer tripod is given.
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LAUFZEITANOMALIEN IM BEREICH EINER STöRUNG*
More LessAbstractThe measurement of well velocity data in the well of Scheibenhardt I has shown that it is possible to observe a well noticeable measurable increase of the travel time of seismic waves when approaching a disturbance. The tectonic event of the disturbance is combined in this case with a disorder (shattering) of the layers without subsequent cementation.
The significance of these anomalies for reflection seismics is discussed. When existing they will then overlap the diffraction, treated by Th. Krey.
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AN ATTEMPT TO INTERPRET THE GRAVIMETRIC MAP OF THE NORTHERN PART OF THE MOROCCAN BASIN OF GHARB. MAPS OF RESIDUAL ANOMALY AND FIRST DERIVATIVE*
Authors SOCIETE CHERIFIENNE DES PETROLES and C. AYNARDAbstractThe main features of the gravimetric map of the Gharb can be related to the shape of the basement, covered by cretaceous and miocene layers, with a total maximum thickness of 13,000 feet. For the interpretation of local features, in the northern part of the basin, first a regional anomaly has been drawn, then the map of the first derivative has been established.
Both maps are compared with geological maps and seismic and electrical surveys. The results are the following:
As for method, the advantages and limitations of both processes are outlined.
As for geological interpretation, it is suggested that most of the local features of the gravimetric map are due to the preriffan tectonics.
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Volumes & issues
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Volume 72 (2023 - 2024)
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Volume 71 (2022 - 2023)
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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)