Refine your search
Collections
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Kumar, Sandeep
- Nanocrystalline Silica from Termite Mounds
Abstract Views :265 |
PDF Views:92
Authors
Affiliations
1 Institute of Nano Science and Technology, Habitat Centre, Phase-X, Sector–64, Mohali 160 062, IN
2 Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110 016, IN
3 Department of Chemistry, Hindu College, University of Delhi, Delhi 110 007, IN
1 Institute of Nano Science and Technology, Habitat Centre, Phase-X, Sector–64, Mohali 160 062, IN
2 Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110 016, IN
3 Department of Chemistry, Hindu College, University of Delhi, Delhi 110 007, IN
Source
Current Science, Vol 106, No 1 (2014), Pagination: 83-88Abstract
To develop a better understanding of the physical properties and microstructures of the termite hill soils, we have carried out studies on the soil samples collected from two locations: near Dehradun, Utta-rakhand and near Hauz Khas, New Delhi. Their ele-mental composition and microstructure were studied using different instrumentation techniques, such as powder X-ray diffraction, field emission scanning electron.Microscopy, transmission electron microscope (TEM) and energy-dispersive analysis of X-ray (EDAX). α-Quartz (SiO2) was present in both the samples, while the sample collected from Hauz Khas, Delhi also con-tained β-cristobalite phase of SiO2. TEM-EDAX showed that termite hill soil consisted of silica (quartz), aluminium oxide, manganese oxide and iron oxide along with small percentage of potassium and calcium. Our studies highlight the potential to gene-rate α-quartz from all termite hills. It is also possible to obtain the less common β-cristobalite form of silica in certain termite mounds.
Keywords
β-Cristobalite, α-Quartz, Termite Mound, Silica.Full Text
- Spatial Distribution pf Landslides Vis-à-Vis Epicentral Distribution of Earthquakes in The Vicinity of The Main Central Thrust Zone, Uttarakhand Himalaya, India
Abstract Views :156 |
PDF Views:81
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 120, No 12 (2021), Pagination: 1927-1932Abstract
Landslides and related mass movement activities along with earthquakes are common in the Himalayan terrain. The distribution of seismic activities in the vicinity of the Main Central Thrust (MCT) is well known. However, in order to assess the relationship between these seismic events and landslides, the spatial distribution of landslides and earthquake events (magnitude >1.5) on either side of the MCT zone was evaluated. It has been observed that seismic events of magnitude <2.1 are clustered around the 1991 Uttarkashi earthquake rupture, 1999 Chamoli earthquake rupture and around Munsiyari. The zone surrounding 1999 Chamoli earthquake rupture indicates the highest earthquake and landslide density of ∼75% and 53% respectively.Keywords
No Keywords.Full Text
References
- Gupta, V., Bhasin, R. K., Kaynia, A. M., Tandon, R. S. and Venkateshwarlu. B., Landslide Hazard in the Nainital township, Kumaun Himalaya, India – the case of Sept 2014 Balia Nala landslide. Nat. Haz., 2016, 80(2), 863–877.
- Gupta, V., Tandon, R. S., Venkateshwarlu, B., Bhasin, R. K. and Kaynia, A. M., Accelerated mass movement activities due to increased rainfall in the Nainital township, Kumaun Lesser Himalaya, India. Zeit. Geomorph., 2017, 61(1), 29–42.
- Kumar, V., Gupta, V. and Sundriyal, Y. P., Spatial interrelationship of landslides, litho-tectonic, and climate regime, Satluj valley, Northwest Himalaya. Geol. J., 2019, 54(1), 537–551.
- Jamir, I., Gupta, V., Thong, G. T. and Kumar, V., Litho-tectonic and precipitation implications on landslides, Yamuna valley, NW Himalaya. Phys. Geogr., 2020, 41(4), 365–388.
- Owen, L. A., Kamp, U., Khattak, G. A., Harp, E. L., Keefer, D. K. and Bauer, M. A., Landslides triggered by the 8 October 2005 Kashmir earthquake. Geomorph., 2008, 94, 1–9.
- Gupta, V., Mahajan, A. K. and Thakur, V. C., A study on landslides triggered during Sikkim Earthquake of September 18, 2011. Him. Geol., 2015, 36(1), 81–90.
- Martha, T. R., Babu Govindharaj, K. and Kumar, V. K., Damage and geological assessment of the 18 September 2011 Mw 6.9 earthquake in Sikkim, India using very high resolution satellite data. Geosci. Front., 2015, 6, 793–805.
- Keefer, D. K., Landslides caused by earthquakes. Geol. Soc. Am. Bull., 1984, 95(4), 406–421.
- Cotton, F., Campillo, M., Deschamps, A. and Rastogi, B. K., Rupture history and seismotectonics of the 1991 Uttarkashi, Himalaya Earthquake. Tectonophysics, 1996, 258, 35–51.
- Mandal, P., Rastogi, B. K. and Gupta, H. K., Recent Indian Earthquakes. Curr. Sci., 2000, 79, 1334–1346.
- Sarkar, I., Pachauri, A. K. and Israil, M., On the damage caused by the Chamoli earthquake of 29 March 1999. J. Asian Earth Sci., 2001, 19(1–2), 129–134.
- Paul, A. and Singh, R., Relevance of seismicity in KumaunGarhwal Himalaya in context of recent 25th April 2015 Mw 7.8 Nepal earthquake. J. Asian Earth Sci., 2017, 144, 253–258.
- Prasath, A., Paul, A. and Singh, S., Upper crustal stress and seismotectonics of the Garhwal Himalaya using small-to-moderate earthquakes: Implications to the local structures and free fluids. J. Asian Earth Sci., 2017, 135, 198–211.
- Negi, S. S., Paul, A., Cesca, S., Kamal, Kriegerowski, M., Mahesh, P. and Gupta, S., Crustal velocity structure and earthquake processes of Garhwal-Kumaun Himalaya: constraints from regional waveform inversion and array beam modelling. Tectonophysics, 2017, 712–713, 45–63.
- Prasath, A., Paul, A. and Singh, S., Earthquakes in the Garhwal Himalaya of the Central Seismic Gap: a study of historical and present seismicity and their implications to the seismotectonics. Pure Appl. Geophys., 2019, 176, 4661–4685.
- Tandon, R. S. and Gupta, V., Estimation of strength characteristics of different Himalayan rocks from Schmidt hammer rebound, point load index and compressional wave velocity. Bull. Eng. Geol. Environ., 2015, 74(2), 521–533.
- Purohit, K. K., Islam, R. and Thakur, V. C., Metamorphism of Psammo-pelitic rocks of Bhagirathi valley, Garhwal Himalaya. J. Him. Geol., 1990, 1, 167–174.
- Petley, D., Global patterns of loss of life from landslides. Geology, 2012, 40(10), 927–930.
- Owen, L. A., Sharma, M. C. and Bigwood, R., Landscape modification and geomorphological consequences of the 20th October 1991 earthquake and the July–August 1992 monsoon in the Garhwal Himalaya. Z. Geomorph. N.F., 1996, 103, 359–372.
- Negi, S. S. and Paul, A., Space time clustering properties of seismicity in the Garhwal-Kumaun Himalaya, India. Him. Geol., 2015, 36(1), 91–101.
- Rawat, G., Arora, B. R. and Gupta, P. K., Electrical resistivity cross-section across the Garhwal Himalaya: proxy to fluidseismicity linkage. Tectonophysics, 2014, 637, 68–79.
- Barnard, P. L., Owen, L. A., Sharma, M. C. and Finkel, R. C., Natural and human-induced landsliding in the Garhwal Himalaya of northern India. Geomorph., 2001, (1–2), 21–35.
- Talukdar, R., Kothyari, G. C. and Pant, C. C., Evaluation of neotectonic variability along major Himalayan thrusts within the Kali River basin using geomorphic markers, Central Kumaun Himalaya, India. Geol. J., 2020, 55(1), 821–844.