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Initiation of plate boundary slip in the Nankai Trough off the Muroto peninsula, southwest Japan
Author(s) -
Tsuji Takeshi,
Matsuoka Toshifumi,
Yamada Yasuhiro,
Nakamura Yasuyuki,
Ashi Juichiro,
Tokuyama Hidekazu,
Kuramoto Shin'ichi,
Bangs Nathan L.
Publication year - 2005
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 - 10.1029/2004gl021861
Subject(s) - geology , accretionary wedge , décollement , slip (aerodynamics) , subduction , seismology , peninsula , plate tectonics , trough (economics) , thrust fault , tectonics , macroeconomics , archaeology , economics , history , physics , thermodynamics
To investigate variations in physical properties accompanying the development of the décollement, we used a neural network analysis of seismic attributes derived from 3D seismic reflection data gathered in the Nankai Trough convergent margin off the Muroto peninsula of southwest Japan. This analysis resulted in a detailed map of the geological features along the décollement and revealed a drastic change in physical properties at the sole of the proto‐thrust. Ocean Drilling Program (ODP) data suggest that the décollement physical property change coincides with the initiation of slip. Furthermore, changes in the structure of the accretionary prism and reorganization of the décollement geometry also attend the initiation of plate boundary slip.