APPLIED GEOPHYSICS - TELFORD PDF
Applied Geophysics. Second Edition. W. M. Telford. McGill University. L. P. Geldart. Former Canadian International Development Agency Program. Director for. Applied Geophysics - Telford, Geldart, Sheriff. Selviana Arifika. Chapter 8 Resistivity Methods INTRODUCTION ment currents are insignificant.) If 8A is an. Applied Geophysics. W. M Telford, L. P. Geldart, R. E. Sheriff and D. A. Keys. Macmillan Company of Canada. p. $ (hardcover only). Reviewed .
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Cambridge Core - Solid Earth Geophysics - Applied Geophysics - by W. M. Telford. Applied Geophysics. Applied Geophysics . PDF; Export citation. Contents. Applied Geophysics (2nd edition) by W. M. Telford, L. P. Geldart and R. E. Sheriff, Cambridge University Press, No. of pages: Price £ (hardback). Telford - Applied zetom.info - Download as PDF File .pdf), Text File .txt) or read online.
The near current electrode is embedded in the zone itself, the other being a large distance away on surface.
The Interpretation Figure 8. Distortion of the equipotentials around the near current electrode by a dipping conductor when using the mise-s-le-mssse method.
The extent, dip, strike, and continuity of the zone will be better indicated by introducing the current directly into it than by the usual mapping techniques. The effect of a dipping mineralized zone on the.
Telford W.M., Geldart L.P., Sheriff R.E. Applied Geophysics pdf
Because the second current electrode is at infinity, it is possible to map the potentials in all directions around the zone without shifting the current stakes. As in other geophysical methods where quanti- tative interpretation is possible, the assessment of results should progress from rough preliminary esti- mates made in the field toward more sophisticated methods of interpretation, eventually based on the complete survey. Such a procedure keeps the field work up-to-date, controls the day-by-day program, and indicates where more intensive work is war- ranted, both in the field survey and its interpretation.
VanNostrand and Cook give a very extensive bibliographyof resistivity interpretation techniques. The use of models, although not as common in resistivity as in EM, can be a useful aid in interpreta- tion.
Resistivity modeling is generally done in a water tank, the resistivity of the liquid being varied by the addition of salts such as NaCI or acids such as H S04' Sand may be used instead of liquid, provided reproducible contacts between the model electrodes and the surface can be made. Various conducting or insulating sheets, cylin- ders, and blocks are immersed in the tank to simu- late the field situation.
The electrode spread is moved about laterally in a convenient jig mount on the surface of the tank; alternatively, in a liquid medium, the model anomaly may be moved past the electrode spread.
Scaling is not a problem in resistivity model work 7. The usual relation in resistivity is!
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VI' a: pII, where I is scaled linearly. Rather than vary the resistivity p, it is simpler to change or I.
How- ever, somewhat higher frequencies could conve- niently be used in the model than in the field without introducing errors. Vertical sounding; Two Horizontal Beds a Basic formula. The method of images devel- oped in Section 8.
Its application to the former also provides some simple illustrations of limiting cases of the bed parameters. Kende, P. Henry, G. Bayrakci, M.
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Grall , Moho depth and crustal thinning in the Marmara Sea region from gravity data inversion , Journal of Geophysical Research: Solid Earth , , 2 , , Wiley Online Library. Figures References Related Information. Email or Customer ID.
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Returning user. Request Username Can't sign in? Forgot your username? Enter your email address below and we will send you your username.If we change Figure 5.
Although the pole-dipole array is not suited to this technique, any of the other three configura- tions may be used, the Sch1umberger having the advantages mentioned in Section 8. Three IP response was obtained. Further examples may be found in Chapter 9 of surveys where resistivity data were obtained in conjunction with IP data. Orellana, E. In Wenner, Schlumberger, and pole-dipole surveys the apparent resistivityis plotted at the midpoint of the potential electrodes, except where one of these is effectively at infinity, as in the modified three-probe system, when the station is reckoned at the near potential elec- trode.
Depth of investigation of colinear electrode arrays over homogeneous anisotropic half-space in direct current methods.
Imagesresulting from two horizontal beds. This is a a very good Graduate level book.
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