NATURAL SOURCE MAGNETOTELLURICS
May 2002 Section 13, Page 14
DATA ACQUISITION COMPLETE
now FILTERING, DECIMATING and
FOURIER TRANSFORMING data:
DATA ACQUISITION IS COMPLETE
FOR THE FIRST STACK
now acquire the next 4 stacks:
The values displayed at the end of each
stack are for the lowest frequency
component in the band. Here the
lowest frequency is .0938 Hz.
MAG. The square root of the
autopower of each component. The E-field
channels are not normalized, so the units
are volts. The H-field channels are
normalized by the antenna calibrates, and
the resultant units are microTeslas.
CC/φ
φφ
φ. Coherency coefficient between
the orthogonal E and H components of the
6th harmonic on the E-field lines, or phase
difference in milliradians on the H-field
lines.
rho. Cagniard or apparent resistivity in ohmmeters for the 6th harmonic. The top value for
RHOxy is calculated using ExHy
*
/HyHy
*
, the bottom value is ExEx
*
/HyEx
*
. The same logic is
used for EyHx.
0097 AMT 0538 12.3 15 Mar 98 09:08:02
Survey Vector AMT
Tx 1 Rx 3 N OUT
.0938- 4 1/ 5 Stacks
6 Levels Point Count: 8285/ 8285
CH Sta/Ant G0 G1 G2 Atn SP GGGA
1Ex 1 16 16 16 OUT 0.00 444O
2Hy 14161616OUT 0.00444O
3Ey 1 16 16 16 OUT 0.00 444O
4Hx 24161616OUT 0.00444O
5OFF
6OFF
7OFF
8OFF
Robust filtering and FFT
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0104 AMT 0538 12.3 15 Mar 98 09:10:11
Survey Vector AMT
Tx 1 Rx 3 N OUT
.0938- 4 1/ 5 Stacks
6 Levels Point Count: 64/ 8285
CH Sta/Ant MAG CC/
φ
φφ
φ
rho GGGA
1Ex 16.2026u 0.99816.89M444O
2Hy 140.0881u1088.616.96M444O
3Ey 16.1684u 0.99715.40M444O
4Hx 240.0917u1112.215.48M444O
5OFF
6OFF
7OFF
8OFF
Taking data
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