On the half‐slope and straight‐slope methods of basement depth determination

Rao, D. Atchuta; Babu, H. V. Ram

doi:10.1190/1.1441763

Cited by 17 publications

(8 citation statements)

References 6 publications

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“…The inflection point is located midway in the delimited straight-slope interval. By comparison, Rao and Babu (1984) estimated S = 0.6 H (thin body) and S = 0.8 H (thick body). It has been our experience that the SSM approach produces results that have a reliability of ±20 percent.…”

Section: Magnetic Depth Determinationmentioning

confidence: 92%

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Application of aeromagnetic data to mineral potential evaluation in Minnesota

Spector

Lawler

1995

GEOPHYSICS

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Aeromagnetic, ground magnetic, and gravity data, together with all available drillhole data and physical property measurements, were used to map the Precambrian geology of an area in Minnesota that is virtually devoid of outcrop. The work was done for purposes of land use planning and to encourage minerals exploration and mostly consisted of the analysis of profiles of aeromagnetic data to map magnetic/ lithologic contacts, to infer structure, and to determine thickness of overburden cover.Two greenstone belts were resolved. They comprise higher density rocks separated by nonmagnetic metasedimentary intervals. The belts are deformed into synclinal structures that, according to modeling, range from 1 km to as much as 5 km in depth. Lithologic predictions were confirmed in five out of six

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Section: Magnetic Depth Determinationmentioning

confidence: 92%

“…This procedure is an analysis approach that is independent of anomaly amplitude (body magnetization). For further evaluation of the SSM, the reader is directed to Rao and Babu (1984). Results observed from 21 Minnesota model anomaly profiles are summarized as follows:…”

Section: Magnetic Depth Determinationmentioning

confidence: 99%

Application of aeromagnetic data to mineral potential evaluation in Minnesota

Spector

Lawler

1995

GEOPHYSICS

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“…A different variant of the tangent method was suggested by Peters (). Quite a number of modifications of the tangent method are available today (Reford and Sumner, ; Dukhovsky et al ., ; Rao and Babu, , etc.). Yet, practically no methodology intended for reducing the inclined magnetization effect and determining θ (which is an important parameter of the obliquely magnetized anomalous bodies) as well as methodologies applicable in conditions of rugged terrain relief and complex host media.…”

Section: Methodology Of Magnetic Data Quantitative Interpretation Ovementioning

confidence: 98%

Quantitative Interpretation of Magnetic Anomalies from Thick Bed, Horizontal Plate and Intermediate Models Under Complex Physical‐Geological Environments in Archaeological Prospection

Eppelbaum

2015

Archaeological Prospection

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Magnetic prospecting is one of the most widely used methods for archaeological prospection in the world. Noise both of natural [main factors are inclined magnetization, complex geological (archaeological) structure of investigated sites, and uneven terrain relief] and artificial origin (different iron-containing targets, electric power lines, etc.) strongly obscure interpretation of observed magnetic anomalies. For quantitative analysis of magnetic anomalies produced by archaeological targets under aforementioned conditions a non-conventional interpreting system has been developed. Methodology of magnetic anomalies interpretation from models of thin bed and horizontal circular cylinder (sphere) in conditions of oblique magnetization, rugged relief and unknown level of the total magnetic field by the use of improved versions of characteristic point and tangents has been earlier suggested. However, many archaeological targets have geometrical form of thick bed, thin horizontal plate and intermediate between these two models. In this paper methodology of magnetic anomalies produced by thick bed models in complex environments is explicitly described. It is shown that quantitative analysis of magnetic anomalies due to intermediate (between the thick bed and thin horizontal plate) targets could be successfully carried out by the use of methodology developed for the thick bed model. In the case of thin horizontal plate with a large horizontal extent, the two measured anomalies may be interpreted as anomalies from thin beds. The interpretation methodology was successfully tested both on typical models and on real archaeological targets with some success.

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“…The amplitude ratio~is a function of Wand 0 only (Atchuta Rao and Ram Babu, 1981). Variation of~with 8' for W = 0, 2, and 4 is shown in Figure 3.…”

Section: Theorymentioning

confidence: 97%

“…The parameters of the dike may be found from its magnetic anomaly by using either (1) the curvematching technique (Hutchison, 1958;Gay, 1963), (2) the method of characteristics (Bruckshaw and Kunaratnam, 1963;Powell, 1965Powell, , 1967Bean, 1966;Koulomzine et aI., 1970;Am, 1972;Atchuta Rao and Ram Babu, 1981), or (3) the computer techniques (e.g., McGrath and Hood, 1970). Interpretation may be accomplished by assuming that the sources have simple geometric shapes.…”

Section: Introductionmentioning

confidence: 99%

A simple method for the analysis of magnetic anomalies over dike‐like bodies

1986

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Magnetic anomalies may be simply analyzed using a dike model. In this model, the depth to the source is approximately 1.25 S, where S is the straight-slope distance measured on the steepest flank. The dip of the body may be evaluated from e, the combined magnetic angle found from the ratio of the maximum amplitude to the minimum amplitude. In the presence of remanence, the body dip 8 may be found from e only when the direction of resultant magnetization is either known or assumed, and magnetization direction may be found only if the dip is known. The minimum susceptibility contrast k of the source may be calculated from the total amplitude A and intensity T of the inducing field using the relationship k = OJ AIr. A large number of aeromagnetic anomalies have been interpreted using this method. A few such anomalies are presented here to illustrate the applicability of the method.

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On the half‐slope and straight‐slope methods of basement depth determination

Cited by 17 publications

References 6 publications

Application of aeromagnetic data to mineral potential evaluation in Minnesota

Application of aeromagnetic data to mineral potential evaluation in Minnesota

Quantitative Interpretation of Magnetic Anomalies from Thick Bed, Horizontal Plate and Intermediate Models Under Complex Physical‐Geological Environments in Archaeological Prospection

A simple method for the analysis of magnetic anomalies over dike‐like bodies

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