| The static shift factor |
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Magnetotelluric (MT) soundings are most effective at depths that exceed the order of a few hundred metres. This means that any subsurface anomalies situated above this may not be directly visible in the recorded data and consequently may not be immediately evident in the corresponding apparent resistivity curves or the subsequent models. Furthermore, these anomalies at an MT survey site can produce a shift or offset of the resultant resistivity curves. Independent of frequency, this galvanic effect is commonly referred to as the static shift, which presents itself as a parallel vertical offset of the MT sounding curve on a log-log plot of resistivity versus frequency. The amount by which the apparent resistivity curve is offset is commonly referred to as the scaling or static shift factor. Download the PDF Application sheet NEW on our website - |
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