摘要:

AbstractThe background of automatic data processing as well as other improvements in prospecting methods is almost certainly economic. Consciously and intentionally or intuitively and even subconsciously, economic forces are the drive for improvements.Automatic processing can contribute to the increasing utility of seismic data. Reduction in the amount of routine work will permit talented people to utilize their time creatively on the more difficult problems. At the same time automatic reduction will provide for a greater volume of work. These two aspects will probably provide the first effective pressure for a high degree of automation.It is to be expected, however, that the ultimate and greatest value will be better interpretation; possibly more detail, possibly clearer more definitive interpretation, possibly both.Time concepts in the processing of seismic data are, of course, vital; either in simple time corrections of either static or dynamic nature or in treatment of signals in the time domain.Much development work is needed before these advantages can be realized. Principal development needed is an increase in dynamic range in the overall system.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01413.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractAn experimental arrangement is described using an electric spark as source and barium titanate as a detector. Model experiments were made in water with the source mounted above the surface. The effect on the pulse shape on transmission through the air‐water interface and the change of pulse shape with depth were investigated. A number of profiles are presented of reflections from a slate slab immersed in the water with different arrangements of the model and detecto

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01414.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe arrays of multiple geophones used in underground seismic prospecting must satisfy two conditions:1) In each group only a few geophones can be used.2) The array must work in a rather wide frequency band.In the present paper the effect of the 3 parameters (geophone spacing, sensitivity and time shift) of a linear array is investigated in order to improve the directional sensitivity of the array.Necessary conditions which are independent of the frequencies are found for the optimum sensitivities of the geophones in a linear array.The optimum values of the parameters mentioned above are calculated for arrays of 2 and 3 geophones and for a frequency band width which may be used in underground seismic prospecting.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01415.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractIn N.W. Germany multiple reflections have been observed in numerous areas. They are not curiosities but represent true problems.In many cases these multiples are recognizable by routine Δtanalysis of the records. Sometimes the Δtanomalies are so great that multiples can be recognized without any computational work, merely by looking at the records. This is due to the great contrast between the interval velocities of the Tertiary and of the Upper Cretaceous. One example is discussed fully.Most of the multiples are of the typeAB(a multiple caused by reflections at two different reflectorsAandB, and at the surface). It is also shown (by a rough estimate) that this type of multiple is theoretically the most probable. Finally, the interference between the two components ofAB(one multiple being reflected first atA, then atB, and the other reflected first atB, then atA), and its appearance in constructed examples, are discusse

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01416.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe paper describes a vertical component magnetometer for field work whose magnet system is provided with a torsion axis and in which torsion serves as a standard of measurement. When a measurement is taken the magnetic axis of the system is brought back into the horizontal position by altering the angle of twist (null‐method). The angle of twist is thus a direct measure of the vertical intensity. The instrument is within wide limits independent of the magnetic north‐south direction and may therefore be set up in practically any position. The magnet system is temperature compensated, well damped and provided with an automatic clamping device. With a scale value of 25 gammas per scale division the range of the instrument for direct measurements is 65000 gammas. A tripod of special design enables a measurement to be taken in about one minute. The weight of the torsion magnetometer inclusive of tripod is only 2.9 kg (6.4

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01417.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

Book review in this articleHarold M. Mooney and W. W. Wetzel: “The Potentials about a Point Electrode and Apparent Resistivity Curves for a Two‐, Three‐ and Four‐Layer Earth”, The University of Minnesota Press, Minneapolis. Pri

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1956.tb01418.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY