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Magnetotelluric data acquisition (view source)
Revision as of 14:24, 20 January 2014
, 14:24, 20 January 2014no edit summary
==Types of surveys==
==Types of surveys==
There are two types of MT surveys: natural source.<ref name=ch16r6>Vozoff, K., 1972, The magnetotelluric method in the exploration of sedimentary basins: Geophysics, vol. 37, no. 1, p. 98–141., 10., 1190/1., 1440255</ref> and controlled source<ref name=ch16r3>Goldstein, M., A., Strangway, D., W., 1975, Audio-frequency magnetotellurics with a grounded electrical dipole source: Geophysics, vol. 40, p. 669–683., 10., 1190/1., 1440558</ref> The equipment and the operational procedures for these two types differ considerably.
There are two types of MT surveys: natural source.<ref name=ch16r6>Vozoff, K., 1972, The magnetotelluric method in the exploration of sedimentary basins: Geophysics, vol. 37, no. 1, p. 98–141., 10., 1190/1., 1440255</ref> and controlled source<ref name=ch16r3>Goldstein, M., A., Strangway, D., W., 1975, Audio-frequency magnetotellurics with a grounded electrical dipole source: Geophysics, vol. 40, p. 669–683., 10., 1190/1., 1440558</ref> The equipment and the operational procedures for these two types differ considerably.
[[file:applying-magnetotellurics_fig16-3.png|thumb|{{figure number|1}}]]
==Natural-source surveys==
==Natural-source surveys==
Although H-field data do not provide information on the subsurface geology (when only H<sub>x</sub> and H<sub>y</sub> components are measured), the vertical H-field component—if measured—provides information on the surface geology.
Although H-field data do not provide information on the subsurface geology (when only H<sub>x</sub> and H<sub>y</sub> components are measured), the vertical H-field component—if measured—provides information on the surface geology.
[[:file:applying-magnetotellurics_fig16-3.png|Figure 1]] shows a typical MT setup for a natural-source survey.
[[file:applying-magnetotellurics_fig16-3.png|thumb|{{figure number|16-3}}]]
[[file:applying-magnetotellurics_fig16-4.png|thumb|{{figure number|2}}]]
==Controlled-source surveys==
==Controlled-source surveys==
Normally, only the E<sub>x</sub> (parallel to the transmitter dipole) and H<sub>y</sub> components are measured.
Normally, only the E<sub>x</sub> (parallel to the transmitter dipole) and H<sub>y</sub> components are measured.
[[:file:applying-magnetotellurics_fig16-4.png|Figure 2]] shows a typical MT setup for a controlled-source survey.
[[file:applying-magnetotellurics_fig16-4.png|thumb|{{figure number|16-4}}]]
==Which method is better?==
==Which method is better?==