Lithospheric electrical imaging of the Deccan trap covered region of western India

Patro, Prasanta K.; Sarma, S. V. S.

doi:10.1029/2007jb005572

Cited by 46 publications

(26 citation statements)

References 88 publications

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“…Three-dimensional modelling studies (Patro & Sarma 2009) conducted in similar situations have shown that the coast effect is stronger in the case of the TM mode than the TE mode. According to Gokarn et al (2004), both TE and TM modes used in two-dimensional modelling show very marginal variations of 0.5Á0.1 in phase and nearly 10% in apparent resistivity for the sites close (ca.…”

Section: Three-dimensional Forward Modellingmentioning

confidence: 99%

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Murthy

Veeraswamy²,

Harinarayana³

et al. 2013

Polar Research

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Maitri Station (70.76°S; 11.73°E) is located in Schirmacher Oasis, a coastal nunatak in north-central Dronning Maud Land covering an area of 35 km2. Here, we report results from the first magnetotelluric experiments and delineate the deep electrical conductivity structure under Schirmacher Oasis using the data acquired during the 24th Indian Antarctic Scientific Expedition. The magnetotelluric method has the advantage of shallow to deeper level coverage as the data acquisition covers a wide frequency band of 10−3–103 Hz, permitting different penetration depths depending on the frequency and conductivity of the layer under investigation. The modelling results indicate the presence of a highly resistive (8000–10 000 ohm m) upper crust, which shows a lateral variation in thickness from 20 km (below site 6) in the east to 10 km (between sites 1 and 2) in the west. It is underlain by a less resistive (500–600 ohm m) lower crust. The highly resistive upper crustal structure supports the existing notion that western Dronning Maud Land is a stable, cratonic platform. Results of free-air gravity, seismic, geomagnetic and surface wave dispersion investigations in East Antarctica also indicate a cratonic-type crust. The results of our study allow us to identify a westward thinning of the upper crust with a marked boundary between sites 1 and 2. We also find evidence for the continuity of the Mozambique mobile belt in East Antarctica on the western side of Schirmacher Oasis

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Section: Three-dimensional Forward Modellingmentioning

confidence: 99%

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Murthy

Veeraswamy²,

Harinarayana³

et al. 2013

Polar Research

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“…1). For the 2D interpretation reported in Patro et al (2005a) and Patro and Sarma (2009) sites were divided into two groups, with impedances from the southern sites (1-18) rotated to 50°W of N, with the remaining sites rotated to 65°W of N. This coordinate system is consistent with the strike (NW-SE) evident in the regional geology (Arya et al, 1995;Peshwa and Kale, 1997). For the EK profile, the regional strike direction was computed using the tensor decomposition techniques of and Becken and Burkhardt (2004).…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 53%

“…We first summarize briefly the 2D inversion results presented in Patro et al (2005a,b) and Patro and Sarma (2009), and relate these to the principal features evident in pseudo-sections for the two profiles. The 2D inversion of TE and TM data was carried out using the nonlinear conjugant gradient (NLCG) algorithm of .…”

Section: Review Of 2d Inversion Resultsmentioning

confidence: 99%

Efficient Inversion of Multi-frequency and Multi-source Electromagnetic Data: Final report

Egbert¹

2013

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. (2) Development at OSU of a new modular system of computer codes for EM inversion Egbert et al., 2013), and initial testing and application of this inversion on several large field data sets Meqbel et al., 2013). (3) Research on more efficient approaches to EM inverse problems, exploiting special features of the multi-transmitter problems that are common in EM imaging applications . The last of these activities was the main motivation for this research project. The first two activities were important enabling steps, and produced useful products and results in their own right. In the following we provide brief summaries of these three activities, and results from each; further technical details are contained in the cited references, which are attached.The project provided partial support for three post-doctoral scholars, who worked with the PI on various aspects of EM inversion, either in terms of development of code or theory, or in applications and testing: Dr. Prasanta Patro (2007; Dr. Anna Kelbert (2008Kelbert ( -2011 and Dr. Naser Meqbel (2010-2011). Project funding also helped the PI to support and interact with several visitors (who brought most or all of their own funding). These include Dr. Aihua Wang, an assistant Professor from Jilin University in China, who visited for one year (2009)(2010); extended visits from two PhD students from Thailand (both now graduated: Dr. Weerachai Sarakorn, and Dr. Chatchai Vachiratienchai), as well as shorter (~6 week) visits from PhD students working with Dr. Oliver Ritter at GFZ-Potsdam in Germany (Dr. Kristina Tietze, and Dr. Xiao-Ming Chen). (1) Collaboration with W. SiripunvarapornThis collaborative activity supported our initial efforts on 3D inversion, resulting in a total of six publications over this project and its predecessor. During the first project (DE-FG02-06ER15818) collaboration with Dr. Siripunvaraporn resulted in development, and release to the academic EM community, of the first freely available 3D inversion code for magnetotelluric (MT) data, WSINV3DMT (http://mucc.mahidol.ac.th/~scwsp/wsinv3dmt/). During the subsequent project period (grant DE-FG02-06ER15819, covered by this report) we continued this collaboration, completing our joint work on development of new approaches to EM inversion (i.e., first steps towards activity 3; and adding new capabilities to WSINV3DMT (parallelization, inversion for vertical field TFs; ). The OSU PI also hosted two PhD students from Mahidol University, for work on projects related to their dissertations. Mr. Weerachai Sarakorn visited for approximately one year , working on 3D finite element modeling for EM geophysics. Mr. Chatchai Vachiratienchai spent 7 months at OSU (Dec. 2010-June 2011, working on controlled source EM inversion, using the ModEM system described below. Both of these students have subsequently completed the PhD degree program, and are working in Thailand. (2) Development of ModEMOur ultimate goal of exploring more efficient search algorithms for multi-transmitter EM inverse problems (activi...

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“…Suggested conductive agents include graphite in the Slave Craton (Jones et al, 2001) , hydrated minerals in the Kaapvaal Craton (Evans et al, 2011) and compositional changes of mantle minerals in the Dharwar Craton (Patro et al, 2009). New results from the Gawler Craton see a similar feature underlying the surface expressions of the Gawler Range Volcanics and the Hiltaba Suite (Thiel and Heinson, 2013).…”

Section: Introductionmentioning

confidence: 76%

The link between electrical conductivity anomalies and rheological boundaries

Thiel

Heinson

2013

ASEG Extended Abstracts

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Lithospheric electrical imaging of the Deccan trap covered region of western India

Cited by 46 publications

References 88 publications

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Electrical structure beneath Schirmacher Oasis, East Antarctica: a magnetotelluric study

Efficient Inversion of Multi-frequency and Multi-source Electromagnetic Data: Final report

The link between electrical conductivity anomalies and rheological boundaries

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