Terms

Residual Gravity Field

The shorter wavelength component of the attributed to density Bouguer gravity field contrasts within high density basement and/or the lower density overburden. Anomalies in the residual field are usually of [...]

2021-12-27T03:48:31-06:00

N

The degree of homogeneity in Euler's equation, interpreted physically as the fall-off rate with distance and geophysically as a structural index (SI). Values vary from 1 to 3 according to [...]

2021-12-27T03:48:35-06:00

Weber

An SI unit measuring magnetic flux. 1 weber = 1 tesla-m2 = 105 gauss-m2 = 109 gamma-m2 = 109 nT-m2

2021-12-27T03:48:37-06:00

Total Magnetic Intensity Anomaly

The total magnetic intensity anomaly field (TI) is the resultant field after correcting TF, the total magnetic (observed) field for a regional gradient field, such as an IGRF.

2021-12-27T03:48:40-06:00

Three Dimensional (3D) Model

Networks or grids of values which model geologic surfaces represented by surfaces of density (gravity) or susceptibility (magnetics) contrast. The output of a forward model is the combined calculated gravity [...]

2021-12-27T03:48:43-06:00

Tesla (T)

An SI unit measuring magnetic flux density. 1 tesla = 109 nanotesla. A cgs unit for stating the magnitude of the magnetic field vector B represented by the number of [...]

2021-12-27T03:48:45-06:00

Susceptibility

A measure of the degree to which a substance may be magnetized. It is a ratio k of the intensity of magnetization I to the causative magnetic field H. It [...]

2021-12-27T03:48:48-06:00

Structural Model (2D or 2½D)

A gravity or magnetic structural model is a 2D or 2½D density and/or susceptibility model of given or assumed geology. The geology of an area can be modeled by representing [...]

2021-12-27T03:48:49-06:00

Structural Index

The Euler deconvolution and Half-Slope Method techniques use first-order derivatives to determine magnetically-based depth estimations for idealized targets, such as sphere, cylinder, thin dike, contact edge.  Each of these targets [...]

2021-12-27T03:48:50-06:00

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