Physics – Geophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..72k&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 6, pp. 72-1, CiteID 1339, DOI 10.1029/2002GL016595
Physics
Geophysics
4
Marine Geology And Geophysics: Marine Seismics (0935), Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Seismology: Earthquake Dynamics And Mechanics, Seismology: Oceanic Crust, Tectonophysics: Plate Boundary-General (3040)
Scientific paper
There are significant variations in the size, especially lateral extent, of the co-seismic rupture zones and inter-plate locked zones for an inter-plate mega-thrust earthquake. Obvious factors controlling those variations have been still unsolved questions. We designed integrated seismic profiles, including a wide-angle seismic profile and a multichannel reflection seismic profile, at the eastern Nankai trough in central Japan. Refraction tomography and pre-stack depth migration of wide-angle seismic data successfully image a trough-parallel cyclic ridge subduction, with thickness of 13-20 km and wavelength of 35-50 km, at a geodetically determined inter-plate locked zone in a non-rupture zone during the 1944 Tonankai mega-thrust earthquake. This result suggests a first direct evidence for the ``subducted seamount = strongly locked'' hypothesis.
Ito Aki
Kaneda Yoshiyuki
Kodaira* Shuichi
Nakanishi Ayako
Park Jin-Oh
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