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Spectral discrimination of Recent sediments around Bhuj, India, using Landsat-TM data and assessment of their vulnerability to seismicity-related failures

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Title Spectral discrimination of Recent sediments around Bhuj, India, using Landsat-TM data and assessment of their vulnerability to seismicity-related failures
 
Creator RAMAKRISHNAN, D
 
Subject Ground deformation
Seismicity
Factor of safety
Hazard vulnerability
Spectral remote sensing
GIS
GUJARAT EARTHQUAKE
KUTCH EARTHQUAKE
LIQUEFACTION
DAMS
PERFORMANCE
DEPOSITS
IMAGERY
SOILS
 
Description Kachchh region of India is a rift basin filled with sediments from Jurassic to Quaternary ages. This area is tectonically active and witnessed several major earthquakes since the recent historical past. During an earthquake event, the water-laden foundation soil liquefies and causes damage to buildings and other civil engineering structures. The January 26, 2001, Bhuj earthquake demonstrated extensive liquefaction-related damages in entire Kachchh Peninsula. Therefore, evaluation of liquefaction susceptibility of unconsolidated sediments is a vital requirement for developing seismic microzonation maps. In this paper, a new approach involving remote sensing techniques and geotechnical procedures is demonstrated for effective mapping of liquefaction-susceptible areas. The present and paleo-alluvial areas representing unconsolidated sediments were mapped using Landsat-TM data and field reflectance spectra. Spectral discrimination of alluvial area was made using the feature-oriented principal component selection and spectral angle mapping techniques. Subsequently, field geotechnical investigations were carried out in these areas. It is evident from the results that the alluvial soils are predominantly sandy loam with very low (7-28) standard penetration test values. The evaluated factor of safety for these soils varies from 0.43 to 1.7 for a peak ground acceleration of 0.38. Finally, a liquefaction susceptibility map is prepared by integrating results on alluvium distribution, factor of safety, and depth to water table.
 
Publisher SPRINGER
 
Date 2014-12-28T14:34:20Z
2014-12-28T14:34:20Z
2014
 
Type Article
 
Identifier NATURAL HAZARDS, 70(1)485-499
0921-030X
1573-0840
http://dx.doi.org/10.1007/s11069-013-0825-5
http://dspace.library.iitb.ac.in/jspui/handle/100/16765
 
Language English