Recording decimated magnetotelluric measurements with coherence

Details Recording decimated magnetotelluric measurements with coherence Recording decimated magnetotelluric measurements with coherence

1981-08-18

1984-05-15

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324 77R, 367 45, 367 49, G01V 308

Patent

active

044490992

ABSTRACT:
In magnetotelluric exploration, channels of measurements of the earth's electric and magnetic field are digitized. Blocks of digital samples are transformed into frequency domain representations of the power spectra, including amplitude and phase, at selected harmonics. The coherence between the power spectra from different channels is determined and compared to a threshold. The power spectra which have a coherence exceeding the threshold are stacked and recorded on magnetic tape.

REFERENCES:
patent: 2390270 (1945-12-01), Piety
patent: 2677801 (1954-05-01), Cagniard
patent: 3188558 (1965-06-01), Yungul
patent: 3541458 (1970-11-01), Klund
patent: 4037190 (1977-07-01), Martin
patent: 4286218 (1981-08-01), Bloomquist et al.
patent: 4339810 (1982-07-01), Nichols et al.
Real Time Fourier Transformation of Magnetotelluric Data, Wight, Bostick, Jr., and Smith 1977, Electrical Geophysics Research Laboratory.

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