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Srivastava, V. K.
- Pebble Fabric Analysis of the Talchir Boulder Bed in the Jharia Coalfield, Bihar
Authors
1 Department of Geology, University of Aligarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 1 (1959), Pagination: 105-115Abstract
The Talchir boulder bed in the Jharia Coalfield, has been studied with special reference to the fabric of the particles that constitute it and an attempt has been made to determine the nature and direction of the depositing agency.
Studies on pebble orientation show that the particles are preferentially oriented in all the sections studied and exhibit an upstream imbrication. The inclination is of the same order of magnitude as determined by Cailleux for fluvial gravels.
The streams that deposited these ancient gravels came from a general westerly and north-westerly direction as shown by the fabric diagrams. It is inferred that the source of the debris was the moraine material left by melting glaciers and that the debris was transported east and south-eastwards by fast flowing streams into the basin of deposition.
- Evolution of Pre-Siwalik Tertiary Basin of Himachal Himalaya
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 3 (1983), Pagination: 134-147Abstract
The Subathu, Dagshai and Kasauli rocks of Himachal sub Himalaya have been classically interpreted as of marine brackish or lagoonal origin. In this study, the pre-Siwalik Tertiary rocks of southern Himachal Pradesh are grouped into five distinct lithofacies, which collectively represent a consanguineous association of sediments deposited in related geomorphic environments: 1. Fossiliferous green shale, locally red, with lenses of limestone interpreted as tidally influenced shelf deposits; 2. Clean white sandstone interpreted as coastal barrier bars; 3. Red mudstone locally green, and lenses of grey sandstone with channel lag interpreted as lagoonal and tidal flat deposits; 4. Grey sandstone with channel lag and red mudstone and siltstone inferred to have accumulated in distributary channel and inter-distributary plains of fluvio-delta complex; 5. Grey, white sandstone and mudstone interpreted as a mixed assemblage of fluvio-delta and coastal barrier facies.
Two systems of currents operated during the deposition of these rocks: one, across the delta plain complex was directed towards south and southwest following the prevailing regional paleoslope; and the other representing longshore currents in adjacent coastal areas operating parallel to shoreline, was directed towards west-northwest.
- Source Parameters and Focal Mechanisms of Local Earthquakes: Single Broadband Observatory at ISM Dhanbad
Authors
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 Department Geology and Geophysics, IIT Kharagpur, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 413-419Abstract
A three-component broadband seismograph is in operation since January 2007 at the Indian School of Mines (ISM) campus. We have used the broadband seismograms of two local earthquakes M <3 recorded by this single station to illustrate its efficacy in understanding the source processes and tectonics in Dhanbad area. Source parameters and fault plane solutions are obtained through waveform inversion. It is observed that these two earthquakes occurred in the lower crust at a depth of 26 km by strike slip faulting. North-south compressional and east-west tensional stresses are dominant in the area, and the lower crust is the source area for the local earthquakes.Keywords
Earthquake, Broadband, Seismograph, Dhanbad.References
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- Evaluation of Crustal and Upper Mantle Structures Using Receiver Function Analysis: ISM Broadband Observatory Data
Authors
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN