Great explanation from the AI....The 89Hz in MobileMT likely refers to the frequency of the electromagnetic field being measured, not directly related to resistivity itself. Here's how they connect:
MobileMT (Magnetotellurics): This geophysical technique uses natural electromagnetic fields from Earth's magnetosphere to probe the electrical conductivity (resistivity) of the subsurface.
Frequency: The natural electromagnetic field has a wide range of frequencies. MobileMT surveys can measure at various frequencies depending on the target investigation depth.
Resistivity: The electrical resistivity of the Earth's subsurface varies depending on the material. For example, conductive materials like clay or mineralized zones will have lower resistivity, while resistive materials like granite or dry sand will have higher resistivity.
Skin Depth: By measuring at different frequencies, MobileMT can investigate different depths. Lower frequencies have a greater skin depth, meaning they can penetrate deeper into the Earth. Conversely, higher frequencies have a shallower skin depth and are more sensitive to near-surface features.
Therefore, the 89Hz in MobileMT likely indicates a specific frequency used in the survey. This frequency might be chosen to target a particular depth range of interest for resistivity mapping.
In summary, MobileMT resistivity is the main target information, and the 89Hz is a tool (frequency) used to achieve that by investigating a specific depth range within the resistivity profile.
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