Gravity anomalies produced by normal and reverse faults, grabens, and fault angle depressions

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Robertson, E.I.; Cowan, M. 1962 Gravity anomalies produced by normal and reverse faults, grabens, and fault angle depressions. [s.l.]: [s.n.]. Report / Geophysics Division 36 17p

Abstract: The geological interpretation of gravity surveys in New Zealand frequently involves the analysis of profiles perpendicular to the strike of faults and the margins of grabens and fault angle depressions in which sedimentary or volcanic rocks overlie the basement rock. This is normally carried out by the use of a two-dimensional graticule (Robertson, 1953) because such structures are usually uniform for a sufficient distance in the strike direction. This method of analysis involves the following steps: an "intelligent guess" is made of the probable structure, the corresponding gravity profile is computed using the graticule and compared with the observed profile, and the assumed structure is modified accordingly until the calculated and observed profiles agree within the limits of accuracy of the gravity values. Although this process is reasonably rapid, a growing need has been felt for a method that would enable the "intelligent guess" to be very close to the best solution, and an estimate to be made of the accuracy with which the hades of any faults associated with the structure can be determined. The method presented in this report is based on the gravitational effect of a semi-infinite horizontal sheet of finite thickness which can be derived from the gravitational effect of a semi-infinite horizontal thin sheet (auth)