Genesis and Morphotectonic Characterisation of Crescent- Shaped feature from Alcock Rise, Andaman Sea
Item
Title (Dublin Core)
en-US
Genesis and Morphotectonic Characterisation of Crescent- Shaped feature from Alcock Rise, Andaman Sea
Description (Dublin Core)
en-US
Study of 98 crescent shape depressions over Alcock Rise, Andaman Sea were reported for the first time in between water depth -500 and -2000 m using multibeam swath bathymetry data. These gigantic depressions have crescent length (CL) varies from 600 to 3800 m and width (CW) varies from 200 to 2500 m with an average central depression of 500 m. Detailed parametric characterization reveals that slope and axial ratio of these crescentic structures have no direct relationship with general shape and steepness of their escarpment. Moreover, spatial distribution of these structures show a clustering of elongated crescent with higher crescent length to width ratio in NW margin of Alcock Rise compare to centre. This change in shape from open elliptical to semicircular depression probably suggests that earlier formed open crescents were modified at later stage to semicircular depressions. As observed in the seismic data, the formation of the crescentic depressions were initiated by the normal fault in-association with major dextral transform fault and subsequently its geometry was modified by local transpression along with seismicity induced slumping and bottom current scouring from the weaker zones. So, tectonics and bottom current activity provides simpler explanation for the formation of crescentic structure over Alcock Rise.Keywords: Crescentic depression, Alcock Rise, Swath bathymetry, Bottom current, Normal fault.
Creator (Dublin Core)
Tripathi, Sachin Kumar
Sathikumar, Resmi
Kaustubhakumari, Jishnu Balagangadharan
Guha, Priyanka Dey
Meitei, Soibam Ishwarchandra
Subject (Dublin Core)
en-US
Crescentic depression; Alcock Rise; Swath bathymetry; bottom current; normal fault.
Publisher (Dublin Core)
en-US
Marine Geological Institute of Indonesia
Date (Dublin Core)
2019-12-10
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
http://ejournal.mgi.esdm.go.id/index.php/bomg/article/view/626
10.32693/bomg.34.2.2019.626
Source (Dublin Core)
en-US
BULLETIN OF THE MARINE GEOLOGY; Vol 34, No 2 (2019)
2527-8843
1410-6175
Language (Dublin Core)
eng
Relation (Dublin Core)
http://ejournal.mgi.esdm.go.id/index.php/bomg/article/view/626/481
Rights (Dublin Core)
en-US
Copyright (c) 2020 BULLETIN OF THE MARINE GEOLOGY