Inversion results of time-domain electromagnetic soundings near Medicine Lake, California, geothermal area

Anderson, Walter L.; Frischknecht, F.C.; Raab, Paul; Bradley, Jerry A.; Turnross, J.; Buckley, T.W.

doi:10.3133/ofr83233

Cited by 5 publications

(6 citation statements)

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“…Transient electromagnetic (TEM) soundings using largeloop transmitters and an in-loop receiver coil have been found to be an accurate method of determining earth resistivity as a function of depth (Spies, 1980;Anderson et al, 1983;Rosenberg and Hoekstra, 1982;Frischknecht and Raab, 1984;Fullagar and Oldenburg, 1984;Raiche et al, 1985;King, 1985;Sinha et al, 1985;Rosenberg et aI., 1985).…”

Section: Introductionmentioning

confidence: 98%

Full transmitter waveform transient electromagnetic modeling and inversion for soundings over coal measures

Asten

1987

GEOPHYSICS

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Modeling of transient electromagnetic soundings requires consideration of the full bipolar transmitter waveform in order to obtain full measurement accuracy from field instruments, The full-waveform transient may be computed using existing impulse-response forward algorithms followed by a convolution procedure with truncation and residual estimation after an even number of terms, which results in average increases in run time of about 80 percent.Simple calculations based on approximations for the behavior of transient decay over (a) a conductive layer over a resistive basement, (b) a homogeneous half-space, and (c) a resistive layer over a conductive basement show that the effect of the full waveform is greatest at sample times near the end of the transmitter off-time, and for the case of a conductive basement. Failure to consider the full waveform is expected to yield errors in the amplitude of the computed transient in the range of 4 to 100 percent or more, depending upon the sample time and type of earth model.Examples of soundings over moderately conductive coal measures and highly conductive cindered coal show that failure to use the full waveform yields depths and resistivities biased to erroneously high values, The bias is small in the former case, but produces substantial errors in the latter case.Depth to the electrical basement of 300 to 400 m may be estimated to accuracies of approximately 5 percent by computer inversion to three-layer or four-layer models.

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Section: Introductionmentioning

confidence: 98%

Full transmitter waveform transient electromagnetic modeling and inversion for soundings over coal measures

Asten

1987

GEOPHYSICS

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“…One of the early applications of TEM is by Anderson et al (1983) for deep investigation at Medicine Lake volcano, California. Fitterman and Stewart (1986) and Hoekstra and Blohm (1990) evaluate the applications of TEM sounding in groundwater investigations.…”

Section: Introductionmentioning

confidence: 99%

The time domain electromagnetic method

Chandra¹

2015

Groundwater Geophysics in Hard Rock

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“…The distributed diskette also contains three "real observed data" files taken from a field survey at Medicine Lake, California, and published by Anderson et al (1983). These files are supplied as additional test data that was previously interpreted using another method, and can be used to further test program INVTCI for comparison purposes (or for practice).…”

Section: Other Observed Data Filesmentioning

confidence: 99%

“…It may be instructive to try your hand at using any of the above "real data sets" without looking at the previously determined least-squares solutions published by Anderson et al (1983). The Medicine Lake data used large square loops with L 1500 feet (457.2 m) on a side, so that a=Lh/ir=251.941 m is used in the data files.…”

Section: Other Observed Data Filesmentioning

confidence: 99%

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Inversion results of time-domain electromagnetic soundings near Medicine Lake, California, geothermal area

Cited by 5 publications

References 1 publication

Full transmitter waveform transient electromagnetic modeling and inversion for soundings over coal measures

Full transmitter waveform transient electromagnetic modeling and inversion for soundings over coal measures

The time domain electromagnetic method

Interactive inversion of transient electromagnetic data for a central-induction loop over layered earth models (version 1.0.)

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