Sub-seafloor acoustic characterization of seamounts near the Ogasawara Fracture Zone in the western Pacific using chirp (3-7 kHz) subbottom profiles SCIE SCOPUS

Cited 11 time in WEB OF SCIENCE Cited 14 time in Scopus
Title
Sub-seafloor acoustic characterization of seamounts near the Ogasawara Fracture Zone in the western Pacific using chirp (3-7 kHz) subbottom profiles
Author(s)
Lee, TG; Hein, JR; Lee, K; Moon, JW; Ko, YT
KIOST Author(s)
Moon, Jai Woon(문재운)Ko, Youngtak(고영탁)
Publication Year
2005-10
Abstract
A detailed analysis of chirp (3-7 kHz) subbottom profiles and bathymetry was performed on data collected from seamounts near the Ogasawara Fracture Zone (OFZ) in the western Pacific. The OFZ, which is a 150 km wide rift zone showing 600 km of right-lateral movement in a NW-SE direction, is unique among the fracture zones of the Pacific in that it includes many old seamounts (e.g., Magellan Seamounts and seamounts on Dutton Ridge). Sub-seafloor acoustic echoes on the seamounts are classified into nine specific types based on the nature and continuity of the echoes, subbottom structure, and morphology of the seafloor: (1) distinct echoes (types I-1, I-2, I-3), (2) indistinct echoes (types II-1, II-2, II-3), and (3) hyperbolic echoes (types III-1,III-2,III-3). Type I-2 pelagic sediments, characterized by thin and intermittent coverage, were probably deposited in topographically sheltered areas when bottom currents were strong, whereas type I-1 pelagic sediments accumulated during continuous and widespread sedimentation. Development of seamount flank rift zones in the OFZ may have been influenced by preexisting structures in the transform fracture zone at the time of volcanism, whereas those on Ita Mai Tai seamount in the Pigafetta Basin originated solely by edifice-building processes. Flank rift zones that formed by dike intrusions and eruptions played an important role in mass wasting. Mass-wasting processes included block faulting or block slides around the summit margin, sliding/slumping, debris flows, and turbidites, which may have been triggered by faulting, volcanism, dike injection, and weathering during various stages in the evolution of the seamounts. (c) 2005 Elsevier Ltd. All rights reserved.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5023
DOI
10.1016/j.dsr.2005.04.009
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.52, no.10, pp.1932 - 1956, 2005
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
MAGNETIC ANOMALY LINEATIONS; VOLCANIC OCEAN ISLANDS; CANARY-ISLANDS; CONTINENTAL-MARGIN; ECHO CHARACTER; DEBRIS FLOW; EAST SEA; DEEP-SEA; SEDIMENTATION; FLANKS
Keywords
western Pacific; seamounts; subbottom profiling; fracture zones; seafloor mapping; mass wasting
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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