Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..102..231f&link_type=abstract
Physics of the Earth and Planetary Interiors, v. 102, p. 231-238.
Physics
11
Scientific paper
We investigated the crustal structure of the Kii peninsula, in the southwestern Japan forearc, using the magnetotelluric (MT) method. We found two upper-crustal anomalies: (1) a sub-horizontal conductive layer dipping northwest, at depths of 5-10 km beneath the Cretaceous accreted terrane; (2) a resistive block at depths of 2-15 km beneath the Tertiary accreted terrane. The former is interpreted as a flysh unit. The latter is consistent with the high-velocity structure detected by refraction experiments and may be a lost continental fragment of the Kuroshio paleoland. Such a continental fragment has been predicted by sedimentological studies, but there had been no geophysical supporting evidence. The mid-crustal seismicity clusters near the bottom of the resistive body. This suggests that the lost paleoland is beneath the current forearc. We also found a conductive layer in the deep crust, consistent with seismic reflectors at 15-25 km depth. This implies trapped free water reflecting a geotherm of 400°C.
Fuji-ta Kiyoshi
Ogawa Yasuo
Yamaguchi Satoru
Yaskawa Katsumi
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