Time‐domain electromagnetic soundings at the Nevada Test Site, Nevada

Frischknecht, F.C.; Raab, Paul

doi:10.1190/1.1441742

Cited by 34 publications

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“…The resistivity of all three basement rock types is generally quite high (>lo0 ohm-m) Where the dolomites are fractured and carry even a few percent water, however, the resistivity may be , (Snyder and Oliver, 1981;Ponce and Hanna, 1982;Healey and others, 1984;Muller and Healey, 1986;Hoover and others, 1982;Frischknecht and Raab, 1984;Snyder and Cam, 1984). significantly reduced (<50 ohm-m) with the contrast detectable by electrical surveys (Hoover and others, 1982).…”

Section: Geopelysical Methodsmentioning

confidence: 97%

“…Minerals that enhance this effect include clay or zeolite minerals which are commonly associated with altered volcanic rocks. Thus, the presence of alteration can be a major factor in producing low-resistivity zones associated with faulting or volcanic ash flows such as found in the stratigraphic section at Yucca Mountain (Frischknecht and Raab, 1984).…”

Section: Earth Resistmtymentioning

confidence: 99%

“…This anomaly is continuous to the south for at least 2,000 m and probably represents a fault. Subsequently, a seismic refraction profile (H. D. Ackermann, written commun., 1984) indicated a low-velocity zone at depth, and electromagnetic soundings by Frischknecht and Raab (1984) indicated a major lateral discontinuity at this location. However, according to G. D.…”

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confidence: 95%

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Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

Ponce¹,

Hunter²

1995

Open-File Report

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(irnteragency Agreement DE-AIO8-92WlO8 74)This report is preliminary and has not been reviewed for conformity with U.S. The use of trade, product, industry, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. .. 11Copies of this report can be purchased from: km) which includes hydrologic, geologic, and environmental study areas. In the consideration of Yucca Mountain as a possible site for storing high-level nuclear waste, a number of geologic concerns have been suggested for study by the National Academy of Sciences which include (1) natural geologic and geochemical barriers, (2) possible hture fluctuations in the water table that might flood a mined underground repository, (3) tectonic stability, and (4) considerations of shaking such as might be caused by nearby earthquakes or possible volcanic eruptions. U. S. Geological SurveyThis volume represents the third part of an overall plan of geophysical investigation of Yucca Mountain, preceded by the Site Characterization Plan (SCP; dated 1988) and the report referred to as the "Geophysical White Paper, Phase I," entitled Status ofData, Major Remlts, and Plum for Geophysical Activities, Yucca Mountain Project (Oliver and others, 1990). The SCP necessarily contained uncertainty about applicability and accuracy of methods then untried in the Yucca Mountain volcano-tectonic setting, and the White Paper, Phase I, focused on summarization of survey coverage, data quality, and applicability of results. For the most part, it did not present data or interpretation. The important distinction of the current volume ("Geophysical White Paper, Phase 11") lies in presentation of data, results, and interpretations of selected geophysical methods used in characterization activities at Yucca Mountain, largely through 1990. Constraints of funding, scheduling, and applicability or availability of methods resulted in unavoidable variability of time fiame of individual investigations. Separate chapters combined here were completed at various times over several years.Yucca Mountain consists of a series of north-trending, eastward-tilted structural blocks bounded by steeply westward-dipping Cenozoic faults. These blocks consist of temgenous volcanic and Some of the most important geologic questions that need to be answered are (1) the depth to, and nature of, the contact between the Cenozoic and Paleozoic rocks, (2) the origin and possible activity of the Quaternary faults, (3) the origin and stability of a rise of about 300 m in the potentiometric surface to the north of an approximate boundary of a potential repository, and (4) the possibility of fbture nearby volcanic activity. As the surface of Yucca Mountain is largely covered with Miocene volcanic flows assigned to the Tiva Canyon Tuff of the Paintbrush Group, geophysical methods and drilling are required to determine the subsurface structure and to answer these questions.Gravity investigations began about 1979 at Yucca Mo...

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Section: Geopelysical Methodsmentioning

confidence: 97%

Section: Earth Resistmtymentioning

confidence: 99%

mentioning

confidence: 95%

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Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

Ponce¹,

Hunter²

1995

Open-File Report

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“…Application of the TEM method to exploration for conductive earth resources has yielded excellent results both in Korea (Lee, Koo, Cho and Lim 1984) and in other countries (e.g. Buselli 1980;Spies 1980;Boyd and Wiles 1984;Frischknecht and Raab 1984;West, Macnae and Lamontagne 1984;Bartel and Hohmann 1985).…”

Section: Methodsmentioning

confidence: 99%

TRANSIENT EM ANALOGUE MODELLING FOR KOREAN TREASURE HUNTING WITH THE SIROTEM SYSTEM¹

Lee¹,

Buselli

1988

Geophysical Prospecting

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LEE, S.K. and BUSELLI, G. 1988. Transient EM analogue modelling for Korean treasure hunting with the SIROTEM system. Geophysical Prospecting 36,976994.The inductive transient electromagnetic method (TEM) shows good potential for the detection of metallic relics of historical interest, such as buried antique bells, Buddhist idols, or precious metal nuggets. The effectiveness of the method was investigated with analogue models, using transmitter-receiver loop configurations with sizes or receiver spacings slightly different from those usually applied in earth resources exploration with the SIROTEM system.The analogue modelling results show that the location and depth of the buried treasure may be obtained from the SIROTEM data. A solid metallic object such as an antique bell could be detected to a depth about 12 times greater than its size, and treasure consisting of separate metallic objects, such as gold nuggets, could be detected to a depth 5 times its linear dimensions with a transmitter current of N 20 A. In scaling down the dimensions of a target, its conductivity should be increased in order to preserve the same TEM conditions found in the field. However, since the buried treasure consists of gold or copper objects, it is not possible to properly scale the conductivity. Hence, in the field, the depth detection limit is expected to be greater than that derived from analogue modelling.

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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: 99%

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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Time‐domain electromagnetic soundings at the Nevada Test Site, Nevada

Cited by 34 publications

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Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

TRANSIENT EM ANALOGUE MODELLING FOR KOREAN TREASURE HUNTING WITH THE SIROTEM SYSTEM¹

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

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Time‐domain electromagnetic soundings at the Nevada Test Site, Nevada

Cited by 34 publications

References 0 publications

Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

Major results of geophysical investigations at Yucca Mountain and vicinity, southern Nevada

TRANSIENT EM ANALOGUE MODELLING FOR KOREAN TREASURE HUNTING WITH THE SIROTEM SYSTEM1

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

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Product

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TRANSIENT EM ANALOGUE MODELLING FOR KOREAN TREASURE HUNTING WITH THE SIROTEM SYSTEM¹