Physics – Geophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..931p&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 7, p. 931-934
Physics
Geophysics
14
Marine Geology And Geophysics: Marine Seismics, Marine Geology And Geophysics: Plate Tectonics, Marine Geology And Geophysics: Seafloor Morphology And Bottom Photography, Tectonophysics: Dynamics, Seismotectonics
Scientific paper
A multi-channel seismic (MCS) reflection survey was conducted to study the structure of the Nankai convergent margin off Shikoku Island in July 1997. Based on reflection characteristics, we could identify three major seismic reflection units, i.e., Units A, B, and C. The MCS data as well as swathbathymetric data reveal a buried circular seamount subducting beneath the Nankai accretionary prism. The subducting seamount is responsible for deformation of the accretionary wedge, resulting in a compressed uplifted sediment knoll and many steep escarpments with NE-SW strike. A possible thrust fault was identified on the seaward flank of the seamount, indicating compressive deformation. A tectonic model for subduction of the seamount is presented based on the interpretation of the MCS data.
Kaneda Yoshiyuki
Kinoshita Hajimu
Kodaira* Shuichi
Kono Yoshiteru
Park Jin-Oh
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