Tectonic microforms and the latest activity of the Nagataki fault, the Nobi active fault system in central Honshu, Japan
Author: Yoshihiko Kariya
Abstract: The Nagataki fault, a 12 km-long left-lateral strike-slip fault of the Nobi active fault system, parallels the Neodani fault which is one of the prominent earthquake faults of the 1891 Nobi earthquake (M=8.0) about 3 km south. Field investigations for estimating the recent activities of the Nagataki fault have found aligned linear depressions and
offset streams along the fault trace. AMS 14C dating of soils obtained from a newly discovered outcrop indicates that soils displaced by the fault had been formed in the period from 1690 to 1960 or after, while undeformed topsoils have been created during the recent several decades. These facts suggest that the Nagataki fault as well as other faults of the Nobi active fault system ruptured in 1891. Estimated offsets of 1.5 m in vertical and 2-3 m in horizontal by the latest activity of the Nagataki fault seem to be appropriate to the rapid decrease in horizontal displacement of the southern part of the Neodani fault.
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