Abstract
Landslide distribution mapping with chronological research is studied in the Wasabizawa Area, southeastern Akita Prefecture. Geomorphological features of landslides, i.e., dissection features of scarps, dissection degree of moving masses, and morphologic relationships to river channels are introduced into the classification of formation. Chronological evidences such as tephra and 14C ages from some representative moving masses are consistent with the geomorphological classification. The estimated primary moving ages of three masses are 35-40 ka, before 10-20 ka, and around 10 ka, while that of one is almost 1 ka. Geomorphological features of low-relief surfaces related to 200-250ka volcanism are also suggested as an indicator of stable body since Middle Pleistocene, of which inactivity is ascertained by the boring survey.
