ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01956.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

ABSTRACTCharts are presented for the computation of the vertical component of the attraction of horizontal laminas and of horizontal cylinders bounded by irregular w‐sided polygons. Contrary to older methods no restricting conditions are made for the directions of the sides of the polygon

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01920.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

AbstractProton precession magnetometers usually operate discontinuously since thy rely one intermittent impulses. The aerial versions of these magnetometers suffer from relatively high background noise. The type of magnetometer discussed in this paper has solved the two problems of discontinuity of measurements and reduced sensitivity due to background noise.Comparative texts with an established flux‐gate apparatus have given significant and convincing result

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01921.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

ABSTRACTThe paper describes a new method for the calculation of standard‐graphs i.e. resistivity‐curves for assumed resistivity profiles. It starts from the integral of Stefanesco and arrives at a system of image poles, similar to, but simpler than earlier developed systems. The advantages of the new method are described, the accuracy is discussed and it is indicated how the accuracy can be improved by a simple artif

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01922.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

AbstractAttenuation caused by transmission is known to be the greater the closer the samples are taken together. As a result, the amplitudes of seismograms with multiple reflections can be expected to be negligible within a more or less brief time interval, as is the case for seismograms without multiple reflections with attenuation. This paper examines the process by which multiple reflections regenerate these greatly attenuated reflections. It is also ascertained that a sampling interval of one ms for continuous velocity logs is valid for any survey. For economic reasons, we recommend the selection of a larger interval without, however, overdoing things and thus losing too much information.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01923.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

ABSTRACTIn the present study an attempt is made to relate the general pattern of reflection seismograms obtained over a coal basin to the acoustical properties peculiar to the Coal Measures. The Carboniferous is characterized by a very rapid succession of distinct lithological units, resulting in a surprising variability in their physical properties. Coal seams in particular are conspicuous by their low density and velocity and they produce acoustical contrasts of 35–50 % with respect to country rock. The resulting heavy shielding action prevents the seismic energy from penetrating deeply into this type of formation.With the aid of synthetic seismograms, arranged into synthetic profiles, it is shown that only a minor part of the Coal Measures reflections is of primary origin. The majority has a secondary character brought about by reverberations inside the weathering zone. Thus the conclusion is reached that reflection shooting allows of mapping only the structure of the top section of the Carboniferous, which is sufficient for the purposes of the coalmining industr

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01924.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

ABSTRACTMore than 1200 cards on geophysical accidents have been accumulated since 1957. Classification of these cards into various categories reveals relative stability in terms of time. It is possible to determine a highly significant severity rating for each category. The greatest hazards are explosion and electrocution.

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01925.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

Book reviewed in this article:S. I. Kuznetsov, M. V. Ivanovand N. N. Lyalikova,Introduction to Geological MicrobiologyOrganic Geochemistry, Editor I. A. Breger

ISSN:0016-8025    

DOI:10.1111/j.1365-2478.1965.tb01926.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY