Spectral discrimination of Recent sediments around Bhuj, India, using Landsat-TM data and assessment of their vulnerability to seismicity-related failures
DSpace at IIT Bombay
View Archive InfoField | Value | |
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
|
|