By Dentith M., Mudge S.T.
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Extra info for Geophysics for the Mineral Exploration Geoscientist
10. The measurement locations are a) Straight traverses b) Irregular traverses c) Square grid d) Random Survey/flight line of the surrounding geology, need to be considered during survey design. 11), provides information about the nature of the geophysical response of the expected subsurface geology useful for survey design.
They form a tensor and are displayed and manipulated in matrix form: 0 1 ∂PX ∂PX ∂PX B ∂x ∂y ∂z C B C 0 1 B C PXX PXY PXZ B ∂PY ∂PY ∂PY C B C or @ PYX PYY PYZ A ð2:1Þ B ∂x ∂y ∂z C B C PZX PZY PZZ B ∂P C @ Z ∂PZ ∂PZ A ∂x ∂y ∂z Several components of the tensor are related as follows: PXY ¼ PYX, PXZ ¼ PZX and PYZ ¼ PZY, so it is not necessary to measure all of them. This means that less complex sensors are needed and measurements can be made more quickly. e. the gradients in the three components in all three directions, provides diagnostic information about the nature of the source of a geophysical anomaly.
When the source varies in shape, this variation also affects the anomaly, with increasing source width producing longer wavelength responses (Fig. 4d). 4) illustrate some important characteristics of many kinds of geophysical responses. 4). Also, anomalies with the same amplitude and wavelength can be caused by various combinations of source depth, geometry and contrast with the host rocks. Without additional information about these variables, the actual nature of the source of the anomaly is indeterminable.
Geophysics for the Mineral Exploration Geoscientist by Dentith M., Mudge S.T.