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Saraf, A. K.
- Remote Sensing Delineation of Zones Susceptible to Seismically Induced Liquefaction in the Ganga Plains
Abstract Views :179 |
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Authors
Affiliations
1 Department of Earth Sciences. University of Roorkee, Roorkee-247667, IN
2 Department of Earth Sciences, University of Roorkee, Roorkee-247667, IN
1 Department of Earth Sciences. University of Roorkee, Roorkee-247667, IN
2 Department of Earth Sciences, University of Roorkee, Roorkee-247667, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 1 (1995), Pagination: 75-82Abstract
Liquefaction in saturated sandy soils as a result of earthquake-induced shaking, poses a major threat to men and materials. Many parts of the Indo-Gangetic plains have experienced such catastrophes repeatedly. The border region of southern Nepal-northern Bihar (India) is a typical existing setting prone to soil liquefaction in the Indo-Gangetic Plains. The Bihar-Nepal earthquake of 1934 (Ms>8) and the earthquake of 1988 (Mb = 6.7) induced extensive liquefaction in the terrain in living memory. Characteristics of soil in this area of nothern Bihar have been determined from field samples. Various parameters (e.g. clay content, D50 - and C-values) indicate high susceptibility to liquefaction among soils in the area.
A close study of remote sensing data (Landsat TM and MSS) products reveals that the boundaries of liquefaction zone in the Bihar-Nepal region during the 1934 earthquake are identifiable on the remote sensing images. This is due to a combination of several inter-related factors, such as landform, soil type, soil moisture and vegetation. These clues have been applied as guides on the adjoining remote sensing images for delineating areas on a regional scale, where liquefaction might possibly occur in the Ganga plains, in the event of future Himalayan earthquakes.
Keywords
Earthquakes, Ganga Plains, Remote Sensing, Seismology.
- Thermal Anomaly from NOAA Data for the Nepal Earthquake
Abstract Views :263 |
PDF Views:104
Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Roorkee 247 667, IN
1 Department of Earth Sciences, Indian Institute of Technology, Roorkee 247 667, IN
Source
Current Science, Vol 110, No 2 (2016), Pagination: 150-153Abstract
No Abstract.Full Text
- Morphodynamic Changes of Lohit River, NE India:GIS-Based Study
Abstract Views :316 |
PDF Views:155
Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
2 Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
1 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
2 Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1810-1816Abstract
The Lohit River is a south bank tributary of the Brahmaputra River. Till 1987, the Lohit River used to meet the Brahmaputra at a place near Bairagi Chapari (27.77°N, 95.44°E). By 1995, the confluence point had shifted about 20 km downstream. One small channel of the Lohit River captured the Dangori River during the 1988 flood. Gradually the Lohit River started flowing along the captured channel. By 1995, it became the trunk channel of the Lohit River and Dibru Saikhowa region became an island. Banklines of Brahmaputra and Lohit rivers have undergone significant changes near their confluence point within the last few decades. By 1987, the south bank of the Brahmaputra near Rohmoria (27.55°N, 95.15°E) shifted about 1.6 km southward from its position in 1973. Interestingly, within the period 1988-90 the south bank shifted about 4.1 km south. This major shifting was the result of capturing of the Dangori River by the Lohit River. However, migration of the rivers towards the south has stopped after 1995. Analysis of SRTM DEM reveals that topographic elevation has played a major role in changing the course of the Lohit River.Keywords
Banklines, Confluence Point, Morphodynamic Changes, Topographic Elevation, Trunk Channel.Full Text
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