A comparison of techniques for magnetotelluric response function estimation

Jones, Alan G.; Chave, Alan D.; Egbert, G. D.; Auld, D. R.; Bahr, Karsten

doi:10.1029/jb094ib10p14201

Cited by 228 publications

(118 citation statements)

References 33 publications

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“…Data in the range 384 Hz-1 Hz were processed in narrow frequency bands containing two frequencies (the 6th and 8th harmonics of the dataset length). Longer period data, 1 s-1820 s, were processed using a cascade decimation scheme (WIGHT and BOSTICK, 1980) with robust adaptation (similar to method 6 of JONES et al, 1989).…”

Section: The Bc87 Datasetmentioning

confidence: 99%

The BC87 Dataset: Tectonic Setting, Previous EM Results, and Recorded MT Data.

Jones

1993

J. geomagn. geoelec

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As part of project LITHOPROBE, magnetotelluric data were acquired at twenty-seven sites along a 150 km east-west profile in southeastern British Columbia straddling the complex tectonic boundary between ancestral North American rocks and those of the easternmost accreted terranes. These data, named the BC87 dataset, display complex effects due to both three-dimensional induction and galvanic scattering at virtually all scale sizes, from that of the electrode array (<50 m) to that of the large plutonic Nelson batholith (150x50 km surface extent). The dataset was distributed widely in order to compare and contrast different schemes for extracting the underlying predominant two-dimensional structure, and to test differing interpretational algorithms on data from a complex crystalline terrane. The MT data are shown, and the tectonic setting described. Also, seismic and previous EM studies of the region are described.

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Section: The Bc87 Datasetmentioning

confidence: 99%

The BC87 Dataset: Tectonic Setting, Previous EM Results, and Recorded MT Data.

Jones

1993

J. geomagn. geoelec

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“…This measurement period would expect data to resolve in periods of 1000 s or at the least 100 s. The MT time series data acquired at each site were pro cessed using statistically robust algorithms from Jones et al (1989) for the MT data. Two electric field orthogonal components and three magnetic field components were recorded simultaneously using three Phoenix MTU-5A and two MTU-2E systems.…”

Section: Data Collection and Analysismentioning

confidence: 99%

An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

Chiang¹,

Hsu²,

Chen³

2015

Terr. Atmos. Ocean. Sci.

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The Chingshui geothermal area southwest of the Ilan plain is identified as a western extension of the Okinawa Trough in the northern Taiwan subduction system. Numerous geophysical, geological and geochemical investigations have been conducted since the 1970s by the Industrial Technology Research Institute, the Chinese Petroleum Corporation of Taiwan and the National Science Council of Taiwan. These studies indicated that the Chingshui stream is one of the largest geothermal areas for electricity generation in Taiwan. However, the power generation efficiency has not met initial expectations. Magnetotelluric (MT) data analyses show that the Chingshui geothermal region is a geologically complex area. A full three-dimensional (3D) inversion was therefore applied to reprocess the MT data and provide the detailed electrical structure beneath the Chingshui geothermal region. The 3D geoelectrical model displays an improved image that clearly delineates the Chingshui geothermal system geometry. Two conductive anomalies are imaged that possibly indicate high potential areas for geothermal energy in the Chingshui geothermal system. One of the potential areas is located in the eastern part of the Chingshui Fault at shallow depths. A significant conductive anomaly is associated with high heat flow and fluid content situations southwest of the geothermal manifest area at depth. A higher interconnected fluid indicates that this area contains the highest potential for geothermal energy in the Chingshui geothermal system.

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“…The time series data acquired at each site was calculated using two robust statistics algorithms (Egbert and Booker, 1986;Jones, 1989) with remote-reference (Gamble et al, 1979) to estimate the response of transfer functions over 0.0026~10,000 seconds from variations in the Earth's natural electromagnetic field. For doing the remote reference technique, remote station was deployed on Penghu island approximately 50 km away from Taiwan ( Figure 1).…”

Section: Mt Data Collection and Analysismentioning

confidence: 99%

High Conductive Zones beneath Mountain Range of Taiwan Imaged by MT Exploration and its Tectonics Interpretation

Chiang¹,

Chen²,

Chen³

et al. 2009

The 13th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2009)

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The Taiwan orogen has formed as a result of the arc-continent collision between the Eurasian continental margin and the Luzon island arc over the last 5 million years and is the type example of an arc-continent collision. The tectonic processes at work beneath Taiwan are still debated, and the available data have been interpreted with both thin-skinned and thick-skinned models. In 2004, the Taiwan Integrated Geodynamical Research (TAIGER) project began a systematic investigation of the crustal and upper mantle structure beneath Taiwan. TAIGER magnetotelluric (MT) data from Central Taiwan favour a thick-skinned model for that region. The Taiwan orogen becomes younger to the south, so the earlier stages of collision were investigated with a 100-km-long MT profile in southern Taiwan. Data were recorded at 15 MT sites and tensor decomposition and two-dimensional inversion were applied to the MT data. The shallow electrical structure is in good agreement with surface geology. The deeper structure shows a major conductor in the mid-crust that can be explained by fluid content of 0.4 -1.4%. A similar feature was observed in Central Taiwan, but with a higher fluid content. The conductor in Southern Taiwan extends to lower crustal depths and is likely caused by fluids generated by metamorphic reactions in a thickened crust. Together the Central and Southern Taiwan MT profiles favor a model with thick skinned deformation.

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A comparison of techniques for magnetotelluric response function estimation

Cited by 228 publications

References 33 publications

The BC87 Dataset: Tectonic Setting, Previous EM Results, and Recorded MT Data.

The BC87 Dataset: Tectonic Setting, Previous EM Results, and Recorded MT Data.

An Investigation of the 3D Electrical Resistivity Structure in the Chingshui Geothermal Area, NE Taiwan

High Conductive Zones beneath Mountain Range of Taiwan Imaged by MT Exploration and its Tectonics Interpretation

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