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Kandpal, G. C.
- Multiple Deformation in the Almora Group of Rocks Around Paharpani, District Nainital (U.P.)
Authors
1 Department of Geology, Kumaun University, Nainital 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 12 (1985), Pagination: 873-879Abstract
The medium grade metasedimentary rocks of Precambrian age around Paharpani, occurring in association with magmatites, gneisses, granites and/or granodiorites constitute a part of the Almora Group. The rocks show complex structures resulting from multipe deformations. Mesoscopic and macroscopic struc1ures indicate that the intense first deformation produced tight to isoclinal reclined folds (F1), leading to thrusting of the Almora Group of rocks over the low grade metasedimentary rocks of the Ramgarh Group along the South Almora Thrust. The effect of less severe deformation on these F1 folds was the formation of warps, crenulations and upright to inclined folds (F2), which show a variation in trend from NW/WNW to SE/ESE and plunge from 12° to 40°, The last phase of deformation produced NNE-ENE trending asymmetrical, open folds (F3) and crenulations. Superposition of F2 folds has resulted in type 1 interference patterns of Ramsay.
- An Interpretation of Regional Structures of Kumaun-Garhwal Himalaya Based on LANDSAT-I Imagery
Authors
1 Department of Geology, Kumaun University, Nainital 263002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 4 (1987), Pagination: 285-295Abstract
A preliminary study and interpretation of LANDSAT-I imagery, covering a large area of Kumaun-Garhwal Himalaya. lying between 79° - 80°30' East longitude and 29°0' - 30°30' North latitude, reveals the presence of four dominant directions of lineaments trending NS, NE-SW, NW/WN-SE/ESE and E-W. The lineament fabric of the region represents axial directions of major folds, regional strike trends of thrusts and of transverse or strike-slip faults. The study is supplemented by detailed structural analysis of mesoscopic folds, planar and linear features present in rocks of three sections of the Kumaun Himalaya and it is suggested that the deformation in rocks of the region was the result of both compressional, tensional, and vertical uplift.- Signature of Quaternary Tectonics in a Part of Dehradun Valley, Uttaranchal
Authors
1 Geological Survey of India, Lucknow - 226 024, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 147-150Abstract
Signatures of active tectonics have been observed in the eastern part of Doon valley in proximity to a lineament (fault?) cutting across the Himalayan grain. A normal fault has been observed over the Doon sediments represented by a sequence of silty clay, gravel and clay exposed in a quarry section. The fault displaces the litho sequence with a vertical throw of 1 5 m. This suggests tectonic movement along the fault during Quaternary period.Keywords
Neotectonics, Quaternary, Doon Valley, Uttaranchal.Full Text
- Macroseismic Study of 20th May 2007 Sikkim Earthquake - Its Seismotectonic Implications for the Region
Authors
1 Geological Survey of India, Northern Region, Lucknow-226 024, IN
2 Geological Survey of India, Eastern Region, Gangtok - 737 101, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 2 (2010), Pagination: 383-392Abstract
An earthquake of magnitude 5.0 with its epicenter in the West Sikkim district occurred on the evening of 20th May 2007. The macroseismic study revealed an ENE-WSW isoseismal pattern indicating a trend conforming to that of the major tectonic discontinuities in this part of the Himalaya.
The relatively moderate event, felt even at far away places like, Siliguri, Darjeeling, etc induced a maximum intensity of VI (MSK) in the form of development of cracks in the walls, fall of thick chunks of plaster in Type A or even Type BC structures at localities like Tashiding, Ralang, Rabang, Keozing, Sakyong, etc.
The study also revealed that the NW-SE trending Tista lineament is playing an important role in the release of the tectonics strain in this region and that the rupture initiated under the influence of the northward directed tectonic stresses at an asperity formed at one of the decollements within the crust by the intersection of this tectonic discontinuity was interpreted to be responsible for this seismic event.