Mahesh P.,CSIR - Central Electrochemical Research Institute |
Catherine J.K.,CSIR - Central Electrochemical Research Institute |
Gahalaut V.K.,CSIR - Central Electrochemical Research Institute |
Kundu B.,CSIR - Central Electrochemical Research Institute |
And 17 more authors.
Gondwana Research | Year: 2012
We analyze GPS data from 26 sites located on the Indian plate and along its boundary. The large spatial coverage of the Indian plate by these sites and longer data duration helped us in refining the earlier estimates of the Euler pole for the Indian plate rotation. Our analysis suggests that the internal deformation of the Indian plate is very low (<1-2mm/year) and the entire plate interior region largely behaves as a rigid plate. Specifically, we did not infer any significant difference in motion on sites located north and south of the Narmada Son failed rift region, the most prominent tectonic feature within the Indian plate and a major source of earthquakes. Our analysis also constrains the motion across the Indo-Burmese wedge, Himalayan arc, and Shillong Plateau and Kopili fault in the NE India. © 2012 International Association for Gondwana Research.
Roy A.B.,Presidency University of India |
Chatterjee A.,Presidency University of India |
Chauhan N.K.,Sukhadia University
Journal of the Geological Society of India | Year: 2013
Kachchh in western Indian Shield, according to the Bureau of Indian Standard (IS:1893:2002), falls in Seismic Zone V. This is intriguing considering that the region is far away from active Plate margin. Apart from the recent incidences of earthquakes, there are several pre-historic/archaeological records of earthquakes in the region. Beyond these, the geological evidence of earth-movements (causing earthquakes) is provided by the occurrence of several' active' faults, which are considered geological markers of palaeoseismicity. There are records of innumerable incidences of faulting in the region in not so distant geological past. Study of fault features especially the scarp faces marking abrupt change in physical relief proves that the different levels of topography in the entire terrain are fault-bound features. Studies also confirm that the topographic difference between the high and 'sunken' features have formed due to uplift and relative down-sagging during the geomorphotectonic evolution of the terrain. Features that make the region unique are: (i) restriction of fault-related deformation zone to a narrow strip between the southern margin of Thar Desert and the south coast line of the Kachchh Peninsula; (ii) overall sub-horizontality of bedding and other topographic and planation surfaces over the entire region; (iii) evidence of fault-controlled geomorphology indicating vertical movement along fault planes; (iv) evidence constraining the time of geomorphological evolution of the terrain only during the Late Quaternary, making it the youngest neotectonically evolved terrain in the Precambrian Indian Shield. © 2013 Geological Society of India.
Bhu H.,Sukhadia University |
Purohit R.,Government College |
Ram J.,Government College |
Sharma P.,Government College |
Jakhar S.R.,Jai Narain Vyas University
Journal of Earth System Science | Year: 2014
We report site motion of a permanent GPS site at Udaipur (udai), Rajasthan on the Udaipur block of Aravalli Craton. The GPS measurements of 2007-2011 suggest that the site moves at a rate of about 49 mm/year towards northeast. As the site motion is consistent with the predicted plate motion using the estimated euler pole of rotation for the Indian Plate, it implies that there is insignificant internal deformation/strain in the region. Such a deformation is consistent with very low seismic activity in the region. The epicenters of the infrequent low magnitude earthquakes are located on the Precambrian lineaments on the west of Udaipur Block, and on the NW-SE striking younger lineament in the south of the block. © Indian Academy of Sciences.
Choudhary B.L.,University of Rajasthan |
Kumar S.,Sukhadia University |
Krishnamurthy A.,University of Rajasthan |
Srivastava B.K.,University of Rajasthan
AIP Conference Proceedings | Year: 2013
DC magnetization measurements have been made on two systems with 30 atomic% and 50 atomic% substitutions of Pr for La in the perovskite LaMn 0.8Co0.2O3. The 30 atomic% sample crystallizes in the O* symmetry (c ≥ a ≥ b/√2) and 50 atomic% sample crystallizes in the O' symmetry (a ≥ c ≥ b/√2). Pr Substitution for La in the series La1-xPrxMn0.8Co 0.2O3 leads to contraction of the cell volume. Lattice parameter a increases with Pr substitution while both b and c decrease. The two systems are ferromagnetic. Curie temperature decreases with increasing substitution of Pr showing weakening of ferromagnetism. Departures between magnetization (M) - temperature (T) curves recorded in field cool and zero field cool mode are indicative of magnetic disorder. However, for both the samples the magnetic field (upto 1 kOe) does not show a marked effect on the peak temperature Tm in M - T curves recorded in zero field cooling mode. © 2013 AIP Publishing LLC.
Ahuja B.L.,Sukhadia University |
Mohammad F.M.,University of Tikrit |
Mohammed S.F.,University of Tikrit |
Sahariya J.,Manipal University India |
And 2 more authors.
Journal of Physics and Chemistry of Solids | Year: 2015
A unique applicability of Compton spectroscopy in probing the electronic states of rare earth aluminides using high energy (662 keV) γ-rays is reported. We have measured first-ever Compton profiles of Dy1-xErxAl2 (x=0, 0.2) using 20Ci 137Cs Compton spectrometer. The charge reorganization in Dy1-xErxAl2 (x=0, 0.2), on the formation of compound, has been discussed using the valence band Compton profile data. The experimental Compton profile data unambiguously establish charge transfer from Al to Dy (Dy and Er) on formation of x=0.0 (0.2) compound, which is in tune with spin polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR) calculations. A reasonable agreement between SPR-KKR based Compton profiles and the experimental data show applicability of the Green function method in predicting the electronic properties of rare earth compounds. © 2014 Elsevier B.V. All rights reserved.