Abstract
Trench excavation investigation revealed that there are at least two seismic faulting events produced by slips on the Gosukebashi fault during the past 6,000 years in the southeastern Rokko Mountains, Japan. Radiocarbon dating and analytic results of volcanic ash show that the alluvial deposits yielded an age of 1,010±70 y. B. P. and the terrace deposits including Kikai-Akahoya volcanic ash yielded an age of 6,300 y. B. P. were displaced by faults. The younger deposits were displaced at least 1 m in horizontal and the terrace deposits including Kikai-Akahoya volcanic ash were displaced about 2 m in vertical. These data indicate that the last seismic faulting event is probably associated with the 1596A. D. Keicho-Fushimi earthquake and the second event occurred in the period between 6,000 y. B. P. and 1596A. D.
