Such predicted responses would--at least--take the form of induced electric and magnetic fields, telluric currents, and changes in earth conductivity.
The most important sources of telluric absorption are molecular oxygen and ozone, which absorb strongly in the near-ultraviolet, and water, which absorbs strongly in the infrared.
Farmer also investigated telluric currents.
There are two types of telluric iron.
The distribution of telluric current density can be used to detect variations in electrical resistivity of underground structures.
Meteoric iron can be distinguished from telluric iron chemically.
Telluric currents result from both natural causes and human activity, and the discrete currents interact in a complex pattern.
However, telluric iron typically contains only around 3% nickel, which is too low for meteorites.
