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Morphology and origin of the Challenger Deep in the Southern Mariana Trench
Author(s) -
Fujioka Kantaro,
Okino Kyoko,
Kanamatsu Toshiya,
Ohara Yasuhiko
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013595
Subject(s) - geology , trench , echelon formation , seismology , subduction , trough (economics) , bathymetry , horst , back arc basin , tectonics , graben , oceanography , layer (electronics) , chemistry , macroeconomics , organic chemistry , economics
A high resolution bathymetry survey reveals the detailed morphology of the Southern Mariana Trench. Distinct right stepping, N80°E trending en echelon deeps were found on the trench bottom within the Challenger Deep. Horst and graben structures were revealed on the outer swell of the Southern Mariana Trench. These structures, as well as slope‐failure on the inner and outer slopes of the trench are similar to features observed in other deep sea trenches. We propose here that the Southern Mariana Trench is a transform fault based on swath mapping, morphological analysis and tectonic interpretation. The en echelon deeps formed in a right‐lateral strike‐slip stress regime related to oblique Pacific/Caroline Plate subduction under the Southern Mariana Trench combined with the Mariana Trough backarc spreading. We confirm that the world's deepest point lies in the western portion of the Challenger Deep, among the en echelon deeps.