Oceanic crust and Moho of the Pacific Plate in the eastern Ogasawara Plateau region
Tsuji, T., Nakamura, Y., Tokuyama, H., Coffin, M.F. and Koda, K. (2007) Oceanic crust and Moho of the Pacific Plate in the eastern Ogasawara Plateau region. Island Arc, 16, (3), 361-373. (doi:10.1111/j.1440-1738.2007.00589.x).
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To show the structure of oceanic crust and Moho around the eastern Ogasawara
Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection
data. To obtain improved velocity models, phase information of seismic signals was
used for velocity analysis and velocity models for oceanic crust above Moho were determined.
We apply this velocity analysis technique to seismic reflection data around the
eastern Ogasawara Plateau, with the result of clear images of structures within oceanic
crust and Moho. South of the Ogasawara Plateau, Moho deepens proximal to the Plateau.
Moho distal to the Plateau is ca 7 km below sea floor (bsf), whereas it is ca 10 km bsf near
the Plateau. The characters of oceanic crust and Moho differ significantly north and south
of the Plateau. To the north, the structure of oceanic crust is ambiguous, the sea floor is
shallower and less smooth, and Moho is discontinuous. To the south, structures within
oceanic crust and Moho are imaged clearly, and the sea floor is deeper. A strong Moho
reflection south of the Plateau might represent a sharp boundary between layered gabbro
and peridotite. However, discontinuous Moho reflections north of the Plateau might represent
rough topography because of intensive magmatism or a gradual downward increase
in velocity within a thick Moho transition zone. A fracture zone north of the Plateau also
appears to separate oceanic crust and Moho of different characters, suggesting vigorous
magmatism between the Plateau and the fracture zone, and that the Ogasawara Plateau
and the fracture zone influenced the genesis of oceanic crust and upper mantle. Differences
in acoustic characteristics to the north and south of the Plateau are apparent in profiles
illuminated by seismic attributes.
|Keywords:||magmatic activities, Moho, oceanic crust, Ogasawara Plateau, seismic attributes, seismic velocity|
|Subjects:||Q Science > QE Geology|
|Divisions:||University Structure - Pre August 2011 > National Oceanography Centre (NERC)
|Date Deposited:||01 Jul 2008|
|Last Modified:||01 Jun 2011 12:03|
|Contributors:||Tsuji, T. (Author)
Nakamura, Y. (Author)
Tokuyama, H. (Author)
Coffin, M.F. (Author)
Koda, K. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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