27-10-2014, 04:15 PM
Deccan traps area covered in India there are about 500,000 square kilometers covering
In Gujarat, Maharashtra and parts of Madhya Pradesh. It is believed that the Deccan traps, due to volcanic eruptions, which occurs prior to the Cretaceous-Eocene 65 on the year and the formation of. Surface trapping layer in the Deccan Trap region caused very strong seismic reflections. Therefore, the Deccan Trap region of deep underground structures by using conventional seismic method is unknown. In addition to the deep seismic sounding (DSS) method and of magnetotelluric (MT) method is an alternative to deeper underground investigation. Frequency-domain, is proportional to the depth of penetration in the uniform resistivity and signals penetrating the media cycle. Therefore, the MT survey covering wide range of cycles (10-1-104), typically triggered by deeper within the Earth resistivity distribution of reliable information. Along the entire Deccan traps and Cambay Graben lying in the Deccan Trap region West of the three configuration files MT data has been recorded. The Ahmedabad--Bhopal profile, West side of the Deccan traps and the other two profiles, and Ahmedabad-Danela Navsari--Ahmedabad, in the Cambay basin in which Deccan Trap formation sedimentary strata underlies Graben runs east of the North-South direction. Victoria part derives from the size of the electrical resistivity and surface impedance of the phase in period range 10-1-3.Three 6x103 second file. Using algorithms based on Nonlinear least squares method follows the contours of these field data has already been reversed-phase as a one-dimensional structure. Ahmedabad--Bhopal things statistics show that three to four layers of the resistivity structure. Not contiguous underground/conductive layer of the crust has been found along this curve. Ahmedabad-Dahne outline of two-dimensional resistivity profiling displayed in synclinal axis of the basin as a whole structure. Sedimentary strata is located at 4 km depth. Maximum thickness, sedimentary rocks, were found in the Center section. In the profile of the North, is regarded as the very high resistance region appears to be regarded as extending to a greater depth because of the Aravallis formation. The Navsari-Ahmedabad profile parallel to the axis of the lower part of the kanbeidi Graben. MT of the purpose of the study was to Deccan to form thick sediment at the bottom of the image formation and image the conductive structure beneath the Deccan traps (Mesozoic sediments). 0.8 and the formation of the Deccan traps to 4.0 km depth different thicknesses has been found. MT data also reveal a thick conductive resistance formed below the Deccan Plateau formation. Formation of conductive thickness in some places have not been demarcated, due to the skin effect in the region. Navsari-get one dimensional resistivity sections Ahmedabad data do not and this is obtained from oil and natural gas Commission, which matches the existing borehole data. GEO-electrical parameter deviations have been found. These deviations appear due to conductive effect is that it is away from the contours of the coast of the Arabian Sea about 20 km. Coast of geomagnetic effects (GCE) is through a two-dimensional finite-difference algorithm Brewitt-Taylor and Weaver (19760 on four possible geophysical (GEO-) models on behalf of India's West Coast area of analysis, these models represent different geological areas along and around the West Coast. Have found that e-polarization modes (currents parallel to the strike) coast of minimal effect. Coast effect distorts the electromagnetic field, which has been used to calculate the resistivity and across cycles ranging from models of surface impedance of phase changes. Magnetic variation is derived (MV) on coastal models more time to study the transfer function has been obtained. Results showed that gliding has significant effect up to km distance from the coast. MTOne-dimensional inverse resistance within the presentation of the data that forms a conductive layer of fiction. Virtual conductive layer upon layer of qualitative estimation of parameters has been carried out on models representative of the West Coast region. Has also been observed that the conductive layers from existing parameters have been changed significantly by coast effect. Quantitative evaluation has been made of the existing conductor layer parameters effect analysis in the conductive strata coast. Deccan traps region was thought to be an earthquake recorded in the stable area in the past 30 years inspite of the slight earthquake. Mechanism of the origin of the earthquake there has been conflict, due to the lack of deeper regional geophysical information. In some parts of the Deccan traps, conductive formations have been in continuous and discontinuous layers of pro forma. Get in the Deccan Trap region are compared with the results of the decision support system from one dimension of the MT data acquired resistivity profiles. In many sites, the electrical conductivity of depth of the stratum is believed to be the same order as low-velocity layers. Low resistivity and low speed attributed to the presence of fluids in the Earth's crust. Fluid in the Deccan Trap region have in the light of the existence of the seismicity of the region were discussed.