ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01468.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractSolutions for the propagation of elastic waves at the surface of a cylindrical hole of infinite length are derived from the wave equation for a perfectly elastic and isotropic medium. It is found that the phase and group velocities depend on the ratio between the wave length and the circumference of the cylindrical hole. These surface waves can be classified into different orders. They differ in the calculated dispersion curves, in the range of possible wave lengths (cut‐off‐frequencies), and in the amplitude proportion of the components of the displacement vector. For very short wave lengths these waves converge to normal Rayleigh waves.These results are used to explain some of the multiple onsets and disturbances on seismograms, obtained in practical seismic investigations in the mines of Siegerland.The conformity of theoretical and practical results is limited, because the idealised suppositions on which the computation is based, such as perfect elasticity, homogeneous and isotropic medium, and circular cross section of the mine gallery are met only approximately in pract

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01469.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe iron ores of the Siegerland district are found in lodes occurring in schists of Lower Devonian age. These lodes, normally dipping almost perpendicularly, could be traced only by seismic reflection measurements underground, up to distances of approximately 500 m. The geophones were attached to the walls of the galleries. The frequencies of the recorded longitudinal and transverse waves ranged from 200 to 500 c.p.s. By this method a new siderite lode was discovered.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01470.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe iron ores of the Siegerland‐district are found in lodes occurring in schists of Lower Devonian age. In the course of the geophysical exploration for these ores, an attempt was also made to clarify the structure and the tectonics of the substratum of the sedimentary rock formations by seismic reflection measurements from the surface. Reflections were recorded in great numbers from layers of Silurian and Devonian age. The form of the folding of the strata derived therefrom corresponds well with that deduced from geological investigations. Beyond that, correlatable reflections were recorded from horizons down to a depth of nearly 25 000 m. It turned out that the iron ore lodes known from the mine workings occur almost vertically above those places where greater dislocations appear in the deepest substratum, and which geologically could be interpreted as fracture zones. The results so far obtained seem to be indicative of the fact that the tectonics of the deepest substratum and the occurrence of ore deposits are related to each othe

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01471.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractThe present paper deals with various causes giving rise to potential differences caused by induced polarization. In order to obtain the induced polarization effect of ore bodies it is necessary to determine the effect of the barren rock and substract it from the total observed effect.Results of field measurements carried out by this method in the mercury mine of Idrija, as well as those in the lead‐zinc mine of Mežica and the Kankberg ore district are in good agreement with the geological data. A theoretically calculated profile is compared with an actual field profi

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01472.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

AbstractA study is made of the possibility of calculating electric potentials, and therefore of interpreting apparent resistivity measurements, when the ground presents structural conditions more complicated than plane, parallel stratification.For this work a schematic type of structure has been chosen, in which the discontinuity planes for electric resistivity are both parallel and perpendicular to the level of the ground.The problem has been examinated in its general aspect, and then some criteria for the numerical calculation have been indicated.Some calculated examples are presented, relevant to vertical electric soundings accomplished by conventional technique, for particular types of structure.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01473.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

摘要:

Book Reviewed in this article:Lehrbuch der angewandten Geophysik, Teil II, H. Haalck.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01474.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1959.tb01475.x

出版商:Blackwell Publishing Ltd    

年代:1959

数据来源: WILEY