摘要:

AbstractThe efficient production of “Geophysical Prospecting” depends upon the co‐operation of the individual authors and this paper serves as a guide for them. Some suggestions are also made on the presentation of papers at meetings in the hope of promoting successful discus

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01290.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe dependence of the apparent resistivity on the distance between the potential electrodes is examined and a numerical method is described permitting quantitative calculations. Such a numerical relation is also established for the transformation of Wenner graphs into Schlumberger graphs.In addition it is shown, in which manner the jumps in observed Schlumberger curves, that result from changing the probe spacing, must be smoothed out.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01291.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractWhen a rather extensive network of short distance refraction profiles was shot the following two observations were made. Firstly, the wave velocity in the weathered layer showed a quite considerable fluctuation in horizontal direction, the extreme values being of the order of 300 and 700 m/sec. A practical result of this scattering of the velocities is that an uncertainty of about 10% is introduced in the computation of the weathering corrections. The second observation is that, in the majority of cases, the travel time curve does not pass through the origin. It could be ascertained that this observation was not caused by errors in the method of observation. A probable explanation of the phenomenon is found in a theory that has been developed by Gassmann, who derived the velocity distribution for a hexagonal packing of spherical solid bodies. According to this theory extremely low velocities would occur in the first few centimeters of the crust of the earth. Qualitatively, our observations are in agreement with the theory of Gassmann.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01292.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractIt has been shown in a paper by L. Y. Faust that the wave velocity in rock depends on the depth below the ground surface according to a specified equation. It follows that the attitude of the planes of equal velocity is influenced by the topographic relief. Under these conditions the problem arises of how to place the reference plane in such a manner, that the fluctuations of the planes of equal velocity, that result from the fluctuations in the topography, shall not affect the results of the depth computations. In the present paper an analytical solution of this problem is given.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01293.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractIn a previous paper by the first author a method has been presented for computing the first vertical derivative of the gravity field or of the magnetic field. In the present paper an analysis is given of the errors in the first vertical derivative that result when the latter is computed by the above method. Two sorts of errors are considered. Firstly, the error in the first vertical derivative that results from the errors in interpolating between isogam lines on the Bouguer anomaly map. Secondly, the error in the first vertical derivative that results from the approximations upon which the computation method is based. The conclusion is reached that both sorts of error are only of minor importance.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01294.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe luni‐solar corrections are considered under the three following aspects:Quality of results: the application of tidal corrections to all stations is pointless as long as the operations do not substantially exceed two hours.Working conditions: it seems possible to increase the duration of programs without any loss of precision, but operating in such a way requires particular care.Behaviour of gravity meters: the introduction of tidal corrections allows to separate three kinds of instrumental drifts; a good knowledge of the mean operational drift enables to appreciate the quality of a given set of measurements.An example is given to show the possibility in some cases to detect small errors which are close to the limit of precision of the instrumen

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1954.tb01295.x

出版商:Blackwell Publishing Ltd    

年代:1954

数据来源: WILEY