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Identification and characterization of marine geohazards in the deep water eastern offshore of India: constraints from multibeam bathymetry, side scan sonar and 3D high-resolution seismic data

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Title Identification and characterization of marine geohazards in the deep water eastern offshore of India: constraints from multibeam bathymetry, side scan sonar and 3D high-resolution seismic data
 
Creator BASTIA, R
RADHAKRISHNA, M
NAYAK, S
 
Subject MUD VOLCANOS
TECTONICS
BASINS
OCEAN
COAST
FAN
Marine Geohazards
3D seismic
Multibeam bathymetry
Eastern offshore of India
Indian Ocean
 
Description The eastern offshore of India covers a vast stretch of sedimentary tract fed by major rivers like Ganges, Brahmaputra and Mahanadi in the north, Krishna and Godavari in the center, and Cauvery and Palar in the south, which led to variations in shelf-slope characteristics, degree of slope and hence slope instability. The structure as well as seismic attribute maps prepared from multibeam bathymetry and high-resolution 3D seismic data set has been analyzed to identify various geohazards in the deep water offshore regions of the east coast of India. These can be categorized as slope instability, slope canyons, shallow gas, mass transport complexes, sediment waves, gas hydrates, gas chimney, mud volcanoes and shallow faults. The slope instability is primarily related to rapid sedimentation by the active river systems while the other geohazards are often developed in association with shallow gas flows and leakages. The bottom simulating reflectors (BSRs) identified in the seismic sections indicate the presence of gas hydrates. Rapid sedimentation, BSR formation, dissolution and expulsion of water as well as gas and their subsequent vertical migration are responsible for the formation of shallow gas-related hazards. The results from the above analysis are of immense help in minimizing the risk of shallow hazards during exploration, drilling and subsurface installation activities along the eastern Indian offshore.
 
Publisher SPRINGER
 
Date 2012-06-26T05:54:32Z
2012-06-26T05:54:32Z
2011
 
Type Article
 
Identifier NATURAL HAZARDS,57(1)107-120
0921-030X
http://dx.doi.org/10.1007/s11069-010-9625-3
http://dspace.library.iitb.ac.in/jspui/handle/100/13980
 
Language English