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Sain, Kalachand
- Delineation of Trap and Subtrappean Mesozoic Sediments in Saurashtra Peninsula, India
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1 No. 19-104/4, Kalyanapuri, Uppal, Hyderabad 500 039, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 No. 19-104/4, Kalyanapuri, Uppal, Hyderabad 500 039, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1844-1851Abstract
Mapping of sediments beneath volcanic Traps is a highly challenging task. Here we report on the analysis of wide-angle seismic data from Trap-covered Saurashtra peninsula to address this problem. Traveltime modelling of mainly seismic refraction and some reflection phases yields basement configuration, trap and subtrappean sediment thicknesses along the Jodia-Ansador (NW-SE) profile in Saurashtra peninsula. Travel-time skip and amplitude decay in seismic refraction data indicate the presence of low-velocity sediments beneath the Traps. The result reveals two layers with Deccan Traps (4.85-5.0 km s-1) followed by Mesozoic sediments above the basement (5.8-6.1 km s-1). Using the lower bound velocity (3.2 km s-1), sediment thickness varies between 800 and 1500 m. Based on upper bound velocity (4.3 km s-1), we find both the sediment thickness and basement depth increase by 600-700 m. The thickness of sediments is more in the northwest and decreases gradually in the southeast, suggesting that the northwestern part of the profile is an important zone for hydrocarbon exploration in the Saurashtra peninsula. With the lower bound velocity of Mesozoics, we find that the basement (5.8-6.1 km s-1) is deep (~2100 m) in the northwest and shallows up near Atkot to ~1.0 km depth, and then deepens further southeast, showing the basement upwarped. The overall velocity and boundary uncertainties are of the order of ±0.15 km s-1 and ± 0.15 km respectively.Keywords
Seismic Refraction, Sediment Thickness, Travel-Time Inversion, Volcanic Traps.Full Text
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- Effectiveness of Amino Acids for Carbon Storage and Utilization Applications
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Authors
Affiliations
1 Gas Hydrate Division, CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
1 Gas Hydrate Division, CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Current Science, Vol 114, No 06 (2018), Pagination: 1163-1165Abstract
Carbon dioxide (CO2), the primary greenhouse gas, can have a major impact on global warming, if present in the earth’s atmosphere beyond permissible limits. In fact, the accumulative emissions of CO2 gas in the atmosphere are progressively increasing causing the global temperature rise by 1.5°C to 2°C (ref. 1). On the other hand, CO2 also can form clathrate hydrates under some favourable thermodynamic conditions.Full Text
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- Causes and Consequences of Rishiganga Flash Flood, Nanda Devi Biosphere Reserve, Central Himalaya, India
Abstract Views :180 |
PDF Views:88
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
Source
Current Science, Vol 121, No 11 (2021), Pagination: 1483-1487Abstract
On 7 February 2021 at 10:30 am, a huge amount of slurry material flooded the Rishiganga catchment, resulting in excessive flow along the valley. The main cause of this flood was the dislocation of a huge rock mass approximately 540 m wide and 720 m long from the main rock body, which slipped down towards the Raunthi Gadera valley floor, causing massive devastation in the areas such as Raini, Tapovan, and Vishnuprayag. This event was not expected and was the first event in history when a flash flood occurred in winter. In this study, we tried to answer two major questions which are not been explained so far that are related to this disaster. These questions are (i) why did this event occur in winters? (ii) where did so much debris and water come from?. This study clearly answers these questions based on field observationsKeywords
Flash Flood, Himalaya, Nanda Devi, Raunthi Gadera, Rishiganga.Full Text
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- Acoustic full-waveform tomography of realistic 2D synthetic seismic elastic data
Abstract Views :169 |
PDF Views:75
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
2 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
Source
Current Science, Vol 122, No 12 (2022), Pagination: 1407-1414Abstract
Advanced computing facilities accelerate the research in highly computational seismic imaging techniques (full-waveform tomography (FWT) and migration) that play a vital role in hydrocarbon exploration. We have carried out a synthetic study to understand the practical intricacies of FWT for its successful application to field seismic data by choosing different strategies. The results show that the high-resolution features, which are missing from the conventional traveltime tomography, are well imaged by the FWT. Further, frequency overlapping is more suitable than discrete frequencies without overlapping for FWT in obtaining reasonable results from multiscale imaging.Keywords
Elastic And Acoustic Data, Frequency Domain, Hydrocarbon Exploration, Ocean-bottom Seismometer, Waveform TomographyFull Text
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- Geo-Hazards in the Himalaya and Remedial Measures : Some Observations in the Light of Recent DAevelopments at Joshimath
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun 248 001, IN
Source
Current Science, Vol 124, No 6 (2023), Pagination: 659-660Abstract
No Abstract.Keywords
No Keywords.Full Text